Spin Dependent Phenomena In Topological And Two Dimensional Materials

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Spin Dependent Phenomena in Topological and Two-dimensional Materials

Author : Wilson Jonathan Yanez Parreno
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Spin Dependent Phenomena in Topological and Two-dimensional Materials by : Wilson Jonathan Yanez Parreno

Download or read book Spin Dependent Phenomena in Topological and Two-dimensional Materials written by Wilson Jonathan Yanez Parreno and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the biggest discoveries in condensed matter physics in the last couple of decades is the relationship between topology and condensed matter physics. On one hand, topology is a branch of mathematics that studies the basic properties of shapes and their spatial relations. On the other hand, condensed matter physics uses quantum mechanics to understand the macroscopic and microscopic behavior of solids. It turns out that these two seemingly different fields of knowledge are intertwined and deeply connected. This makes, the effort of understanding the consequences of topology in condensed matter systems a worthy scientific endeavor that will deepen our understanding of the basic properties of solids and might impact the future of technology in different applications. In this dissertation, we study the role of spin in the macroscopic behavior of novel families of topological quantum materials. We part ways from well-studied topological insulators and turn our attention to topological Dirac and Weyl semimetals. This work focuses on archetypal members of these families of materials namely: Cd3As2, TaAs and NbAs. We establish their synthesis in thin film form using molecular beam epitaxy (MBE) in common semiconductor substrates (GaAs, GaSb). We combine them with the soft ferromagnet, permalloy (Ni0.80Fe0.20), and use well established techniques such as spin torque ferromagnetic resonance (ST-FMR) and spin pumping (SP) to show that spin dependent phenomena plays an important role in these systems. This allows us to quantify the efficiency of the charge-spin interconversion in these materials, which together with electrical transport measurements allow us to estimate their spin Hall conductivity ([sigma]SH). These values are then compared with first principles calculations with a good qualitative and quantitative agreement. One of our main findings is that natural surface oxidation of these compounds plays a major role in spin transport and can enhance the charge-spin interconversion efficiency. With this knowledge, we take some members of these families of materials to the ultrathin regime. We have interfaced a Dirac semimetal (ZrTe2) with a two-dimensional magnet (CrTe2) and made a proof of concept device which shows that the spin of electrons in the Dirac semimetal can be controlled by electrical means and can be used to switch the magnetization direction of the ferromagnet, effectively making a quasi two-dimensional memory with topological materials. This motivated us to do similar experiments and study the behavior of spin in metals (Pb) once they are taken to the two-dimensional regime. This dissertation studies topology, spin transport and ferromagnetism in Dirac and Weyl semimetals, two-dimensional metals and two-dimensional ferromagnets.

Electronic and Spin Dependent Phenomena in Two-dimensional Materials and Heterostructures

Author : Jinsong Xu (Ph. D. in physics)
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (111 download)

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Book Synopsis Electronic and Spin Dependent Phenomena in Two-dimensional Materials and Heterostructures by : Jinsong Xu (Ph. D. in physics)

Download or read book Electronic and Spin Dependent Phenomena in Two-dimensional Materials and Heterostructures written by Jinsong Xu (Ph. D. in physics) and published by . This book was released on 2018 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene has remarkable opportunities for spintronics due to its high mobility and long spin diffusion length, especially when encapsulated in hexagonal boron nitride (h-BN). Beyond the three basic processes of spin injection, spin transport, and spin detection, it is crucial to explore new methods of spin manipulation in order to develop novel architectures for spin-based logic. In the first chapter of this thesis, I briefly introduce the field of spintronics and graphene related research. In the second chapter, I present the spin diffusion model used in this thesis to analyze spin transport in graphene and heterostructures spintronics. In the third chapter, I present my work on gate-tunable spin transport in h-BN encapsulated graphene-based spin valves with one-dimensional ferromagnetic contacts. The non-local spin signal can be tuned by gate voltage and even change polarity. The gate-controlled spin polarity via magnetic proximity effect may overcome the usual need for an applied magnetic field and a magnetization reversal to implement the graphene-based spin logic. Beyond magnetic proximity effect, another route for graphene spintronics is to combine with other two-dimensional (2D) materials, such as transition metal dichalcogenide (TMDC). In the fourth chapter, I demonstrate spin injection from monolayer MoS2 to few-layer graphene following optical valley/spin exciation in MoS2 with circularly polarized light up to room temperature. The magnitude and direction of spin polarization is controlled by both helicity and photon energy. These results demonstrate a 2D spintronic/valleytronic system that achieves optical spin injection and lateral spin transport at room temperature in a single device, which paves the way for multifunctional 2D spintronic devices for memory and logic applications. While graphene/TMDC heterostructures hold great promise for the electrical and optical control of spins in graphene, the observed spin lifetimes in these heterostructures are short (

Spin Dynamics in Two-Dimensional Quantum Materials

Author : Marc Vila Tusell
Publisher : Springer Nature
ISBN 13 : 3030861147
Total Pages : 169 pages
Book Rating : 4.0/5 (38 download)

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Book Synopsis Spin Dynamics in Two-Dimensional Quantum Materials by : Marc Vila Tusell

Download or read book Spin Dynamics in Two-Dimensional Quantum Materials written by Marc Vila Tusell and published by Springer Nature. This book was released on 2021-11-10 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the exploration of nontrivial spin dynamics in graphene-based devices and topological materials, using realistic theoretical models and state-of-the-art quantum transport methodologies. The main outcomes of this work are: (i) the analysis of the crossover from diffusive to ballistic spin transport regimes in ultraclean graphene nonlocal devices, and (ii) investigation of spin transport and spin dynamics phenomena (such as the (quantum) spin Hall effect) in novel topological materials, such as monolayer Weyl semimetals WeTe2 and MoTe2. Indeed, the ballistic spin transport results are key for further interpretation of ultraclean spintronic devices, and will enable extracting precise values of spin diffusion lengths in diffusive transport and guide experiments in the (quasi)ballistic regime. Furthermore, the thesis provides an in-depth theoretical interpretation of puzzling huge measured efficiencies of the spin Hall effect in MoTe2, as well as a prediction of a novel canted quantum spin Hall effect in WTe2 with spins pointing in the yz plane.

Spintronics Handbook, Second Edition: Spin Transport and Magnetism

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 0429805268
Total Pages : 646 pages
Book Rating : 4.4/5 (298 download)

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Book Synopsis Spintronics Handbook, Second Edition: Spin Transport and Magnetism by : Evgeny Y. Tsymbal

Download or read book Spintronics Handbook, Second Edition: Spin Transport and Magnetism written by Evgeny Y. Tsymbal and published by CRC Press. This book was released on 2019-06-26 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spintronics Handbook, Second Edition offers an update on the single most comprehensive survey of the two intertwined fields of spintronics and magnetism, covering the diverse array of materials and structures, including silicon, organic semiconductors, carbon nanotubes, graphene, and engineered nanostructures. It focuses on seminal pioneering work, together with the latest in cutting-edge advances, notably extended discussion of two-dimensional materials beyond graphene, topological insulators, skyrmions, and molecular spintronics. The main sections cover physical phenomena, spin-dependent tunneling, control of spin and magnetism in semiconductors, and spin-based applications. Features: Presents the most comprehensive reference text for the overlapping fields of spintronics (spin transport) and magnetism. Covers the full spectrum of materials and structures, from silicon and organic semiconductors to carbon nanotubes, graphene, and engineered nanostructures. Extends coverage of two-dimensional materials beyond graphene, including molybdenum disulfide and study of their spin relaxation mechanisms Includes new dedicated chapters on cutting-edge topics such as spin-orbit torques, topological insulators, half metals, complex oxide materials and skyrmions. Discusses important emerging areas of spintronics with superconductors, spin-wave spintronics, benchmarking of spintronics devices, and theory and experimental approaches to molecular spintronics. Evgeny Tsymbal's research is focused on computational materials science aiming at the understanding of fundamental properties of advanced ferromagnetic and ferroelectric nanostructures and materials relevant to nanoelectronics and spintronics. He is a George Holmes University Distinguished Professor at the Department of Physics and Astronomy of the University of Nebraska-Lincoln (UNL), Director of the UNL’s Materials Research Science and Engineering Center (MRSEC), and Director of the multi-institutional Center for NanoFerroic Devices (CNFD). Igor Žutić received his Ph.D. in theoretical physics at the University of Minnesota. His work spans a range of topics from high-temperature superconductors and ferromagnetism that can get stronger as the temperature is increased, to prediction of various spin-based devices. He is a recipient of 2006 National Science Foundation CAREER Award, 2005 National Research Council/American Society for Engineering Education Postdoctoral Research Award, and the National Research Council Fellowship (2003-2005). His research is supported by the National Science Foundation, the Office of Naval Research, the Department of Energy, and the Airforce Office of Scientific Research.

Spintronics Handbook, Second Edition: Spin Transport and Magnetism

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 0429750897
Total Pages : 735 pages
Book Rating : 4.4/5 (297 download)

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Book Synopsis Spintronics Handbook, Second Edition: Spin Transport and Magnetism by : Evgeny Y. Tsymbal

Spintronics Handbook

Author : Evgeny Y. Tsymbal
Publisher :
ISBN 13 : 9781498769723
Total Pages : 0 pages
Book Rating : 4.7/5 (697 download)

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Book Synopsis Spintronics Handbook by : Evgeny Y. Tsymbal

Download or read book Spintronics Handbook written by Evgeny Y. Tsymbal and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition offers an update on the single most comprehensive survey of the two intertwined fields of spintronics and magnetism, covering the diverse array of materials and structures, including silicon, organic semiconductors, carbon nanotubes, graphene, and engineered nanostructures. It focuses on seminal pioneering work, together with the latest in cutting-edge advances, notably extended discussion of two-dimensional materials beyond graphene, topological insulators, skyrmions, and molecular spintronics. The main sections cover physical phenomena, spin-dependent tunneling, control of spin and magnetism in semiconductors, and spin-based applications.

Spintronics Handbook Second Edition

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 9780367779702
Total Pages : 0 pages
Book Rating : 4.7/5 (797 download)

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Book Synopsis Spintronics Handbook Second Edition by : Evgeny Y. Tsymbal

Download or read book Spintronics Handbook Second Edition written by Evgeny Y. Tsymbal and published by CRC Press. This book was released on 2021-03-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition offers an update on the single most comprehensive survey of the two intertwined fields of spintronics and magnetism, covering the diverse array of materials and structures, including silicon, organic semiconductors, carbon nanotubes, graphene, and engineered nanostructures. It focuses on seminal pioneering work, together with the latest in cutting-edge advances, notably extended discussion of two-dimensional materials beyond graphene, topological insulators, skyrmions, and molecular spintronics. The main sections cover physical phenomena, spin-dependent tunneling, control of spin and magnetism in semiconductors, and spin-based applications.

Spintronics Handbook, Second Edition

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 9781498769600
Total Pages : 590 pages
Book Rating : 4.7/5 (696 download)

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Book Synopsis Spintronics Handbook, Second Edition by : Evgeny Y. Tsymbal

Download or read book Spintronics Handbook, Second Edition written by Evgeny Y. Tsymbal and published by CRC Press. This book was released on 2019-05-06 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition offers an update on the single most comprehensive survey of the two intertwined fields of spintronics and magnetism, covering the diverse array of materials and structures, including silicon, organic semiconductors, carbon nanotubes, graphene, and engineered nanostructures. It focuses on seminal pioneering work, together with the latest in cutting-edge advances, notably extended discussion of two-dimensional materials beyond graphene, topological insulators, skyrmions, and molecular spintronics. The main sections cover physical phenomena, spin-dependent tunneling, control of spin and magnetism in semiconductors, and spin-based applications.

Spintronics Handbook, Second Edition: Spin Transport and Magnetism

Author : Evgeny Y. Tsymbal
Publisher :
ISBN 13 : 9780367777876
Total Pages : 0 pages
Book Rating : 4.7/5 (778 download)

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Book Synopsis Spintronics Handbook, Second Edition: Spin Transport and Magnetism by : Evgeny Y. Tsymbal

Download or read book Spintronics Handbook, Second Edition: Spin Transport and Magnetism written by Evgeny Y. Tsymbal and published by . This book was released on 2021-03-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition offers an update on the single most comprehensive survey of the two intertwined fields of spintronics and magnetism, covering the diverse array of materials and structures, including silicon, organic semiconductors, carbon nanotubes, graphene, and engineered nanostructures. It focuses on seminal pioneering work, together with the latest in cutting-edge advances, notably extended discussion of two-dimensional materials beyond graphene, topological insulators, skyrmions, and molecular spintronics. The main sections cover physical phenomena, spin-dependent tunneling, control of spin and magnetism in semiconductors, and spin-based applications.

Nanoscale Spintronics and Applications

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 9781498769709
Total Pages : 628 pages
Book Rating : 4.7/5 (697 download)

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Book Synopsis Nanoscale Spintronics and Applications by : Evgeny Y. Tsymbal

Download or read book Nanoscale Spintronics and Applications written by Evgeny Y. Tsymbal and published by CRC Press. This book was released on 2019-06-27 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spintronics Handbook, Second Edition offers an update on the single most comprehensive survey of the two intertwined fields of spintronics and magnetism, covering the diverse array of materials and structures, including silicon, organic semiconductors, carbon nanotubes, graphene, and engineered nanostructures. It focuses on seminal pioneering work, together with the latest in cutting-edge advances, notably extended discussion of two-dimensional materials beyond graphene, topological insulators, skyrmions, and molecular spintronics. The main sections cover physical phenomena, spin-dependent tunneling, control of spin and magnetism in semiconductors, and spin-based applications. Features: Presents the most comprehensive reference text for the overlapping fields of spintronics (spin transport) and magnetism. Covers the full spectrum of materials and structures, from silicon and organic semiconductors to carbon nanotubes, graphene, and engineered nanostructures. Extends coverage of two-dimensional materials beyond graphene, including molybdenum disulfide and study of their spin relaxation mechanisms Includes new dedicated chapters on cutting-edge topics such as spin-orbit torques, topological insulators, half metals, complex oxide materials and skyrmions. Discusses important emerging areas of spintronics with superconductors, spin-wave spintronics, benchmarking of spintronics devices, and theory and experimental approaches to molecular spintronics. Evgeny Tsymbal's research is focused on computational materials science aiming at the understanding of fundamental properties of advanced ferromagnetic and ferroelectric nanostructures and materials relevant to nanoelectronics and spintronics. He is a George Holmes University Distinguished Professor at the Department of Physics and Astronomy of the University of Nebraska-Lincoln (UNL), Director of the UNL's Materials Research Science and Engineering Center (MRSEC), and Director of the multi-institutional Center for NanoFerroic Devices (CNFD). Igor Zutic received his Ph.D. in theoretical physics at the University of Minnesota. His work spans a range of topics from high-temperature superconductors and ferromagnetism that can get stronger as the temperature is increased, to prediction of various spin-based devices. He is a recipient of 2006 National Science Foundation CAREER Award, 2005 National Research Council/American Society for Engineering Education Postdoctoral Research Award, and the National Research Council Fellowship (2003-2005). His research is supported by the National Science Foundation, the Office of Naval Research, the Department of Energy, and the Airforce Office of Scientific Research.

Spin-related Phenomena in Two-dimensional Materials

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (935 download)

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Book Synopsis Spin-related Phenomena in Two-dimensional Materials by :

Download or read book Spin-related Phenomena in Two-dimensional Materials written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Metallic Spintronics

Author : Evgeny Y. Tsymbal
Publisher :
ISBN 13 : 9781498769525
Total Pages : 0 pages
Book Rating : 4.7/5 (695 download)

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Book Synopsis Metallic Spintronics by : Evgeny Y. Tsymbal

Download or read book Metallic Spintronics written by Evgeny Y. Tsymbal and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Revised part of an earlier publication entitled Handbook of spin transport and magnetism. c2012.

Spin Current

Author : Sadamichi Maekawa
Publisher : Oxford University Press
ISBN 13 : 0198787073
Total Pages : 541 pages
Book Rating : 4.1/5 (987 download)

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Book Synopsis Spin Current by : Sadamichi Maekawa

Download or read book Spin Current written by Sadamichi Maekawa and published by Oxford University Press. This book was released on 2017 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a new branch of physics and technology, called spin-electronics or spintronics, the flow of electrical charge (usual current) as well as the flow of electron spin, the so-called "spin current", are manipulated and controlled together. This book is intended to provide an introduction and guide to the new physics and applications of spin current.

Spintronics Handbook, Second Edition: Spin Transport and Magnetism

Author : Evgeny Y. Tsymbal
Publisher : CRC Press
ISBN 13 : 0429784376
Total Pages : 530 pages
Book Rating : 4.4/5 (297 download)

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Book Synopsis Spintronics Handbook, Second Edition: Spin Transport and Magnetism by : Evgeny Y. Tsymbal

Introduction to Spintronics

Author : Supriyo Bandyopadhyay
Publisher : CRC Press
ISBN 13 : 148225557X
Total Pages : 650 pages
Book Rating : 4.4/5 (822 download)

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Book Synopsis Introduction to Spintronics by : Supriyo Bandyopadhyay

Download or read book Introduction to Spintronics written by Supriyo Bandyopadhyay and published by CRC Press. This book was released on 2015-09-18 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Spintronics provides an accessible, organized, and progressive presentation of the quantum mechanical concept of spin and the technology of using it to store, process, and communicate information. Fully updated and expanded to 18 chapters, this Second Edition:Reflects the explosion of study in spin-related physics, addressing seven

Theoretical Studies of Spin Dependent Transport Phenomena

Author : Christoph Michel
Publisher : Cuvillier Verlag
ISBN 13 : 3867274851
Total Pages : 205 pages
Book Rating : 4.8/5 (672 download)

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Book Synopsis Theoretical Studies of Spin Dependent Transport Phenomena by : Christoph Michel

Download or read book Theoretical Studies of Spin Dependent Transport Phenomena written by Christoph Michel and published by Cuvillier Verlag. This book was released on 2007 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Theory of Intrinsic Spin-dependent Transport in Semiconductors and Two-dimensional Membranes

Author : Yang Song
Publisher :
ISBN 13 :
Total Pages : 211 pages
Book Rating : 4.:/5 (868 download)

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Book Synopsis Theory of Intrinsic Spin-dependent Transport in Semiconductors and Two-dimensional Membranes by : Yang Song

Download or read book Theory of Intrinsic Spin-dependent Transport in Semiconductors and Two-dimensional Membranes written by Yang Song and published by . This book was released on 2013 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A reliable theoretical framework is developed for spin-dependent transport in the presence of electron-phonon interactions. The centerpiece of the theory explores the symmetry of the studied systems and processes. In addition, microscopic kinetic processes are incorporated. Rigorous numerical methods are employed in order to verify our predictions. Applying the theory to potential key semiconductors for spintronics, such as silicon and germanium, and to the nascent material family of two-dimensional membranes, one obtains physical clarity as well as explicit analytical results. Following the construction of electronic and phonon states, we derive spin-dependent electronphonon scattering matrix elements for all processes induced by acoustic or optical phonons (including transparent derivations of important two-phonon processes in two-dimensional membranes), intravalley or intervalley scattering for multivalley conduction bands, and interband scattering for the gapless graphene. The resulting expressions are explicit functions of electron wavevectors, spin orientation, phonon modes and valley positions. Using the acquired insights, remarkable physical consequences are discovered. These include optimal spin transport in Si by combining strain and geometrical constrains, extremely long room-temperature spin lifetime in strained Ge when the spin is oriented parallel to a [111] strain (~1 [mu]s), and ultrafast electron spin relaxation in single-layer transition-metal dichalcogenides. By the unique properties of two-dimensional membranes inherited from their mirror symmetry and out-of-plane softness, we notice decoupling between spin and momentum transport due to scattering with out-of-plane acoustic phonons (the most populous branch). By symmetry analysis of orbital configurations, contrasting spin splitting and spin flip constants are predicted for the conduction bands of various single-layer transition-metal dichalcogenides. In addition to transport phenomena, we also apply the theory to optical excitation of hot excitons. Incorporating microscopic spin-flip results into Boltzmann transport equations, one can explore spin communication applications. Apart from spin relaxation, spin injection and detection are also key phases. We study tunnel-barrier profiles that are complicated by doping inhomogeneity, and quantify the limitations on the applied bias due to detrimental spin relaxation of hot electrons in zinc-blende semiconductors. Importantly, we elaborate dynamic signals of high-frequency devices, and noncollinear magnetization configurations of the electrodes to discuss optimal information density"--Page vii-viii.