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Rashba spin orbit

Andrey V Matetskiy, Nikita V Denisov, Andrey V Zotov, Alexander A Saranin
Creation of the 2D metallic layers with the thickness as small as a few atomic layers and investigation of their properties are interesting and challenging tasks of the modern condensed-matter physics. One of the possible ways to grow such layers resides in the synthesis of the so-called metal-induced reconstructions on silicon (i.e., silicon substrates covered with ordered metal films of monolayer or submonolayer thickness). The 2D Au-Tl compound on Si(111) surface having √7×√7 periodicity belongs to the family of the reconstructions incorporating heavy-metal atoms with a strong spin-orbit coupling (SOC)...
December 4, 2018: Nano Letters
Jikai Lyu, Wei-Xiao Ji, Shu-Feng Zhang, Chang-Wen Zhang, Pei-Ji Wang
Rashba spin-orbit coupling (SOC) in Topological Insulator (TI) is very interesting phenomenon and has received extensive attention in two-dimensional (2D) materials. However, the coexistence of Rashba SOC and band topology, especially for materials with square lattice, is still lacking. Here, by using first-principles calculations, we propose for the first time SeTe monolayer as a 2D candidate with this novel properties. We find that square lattice exhibits anisotropic band dispersions near the Fermi level and Rashba effect related to large SOC and inversion asymmetry, which lead to Dirac semimetal state...
November 26, 2018: ACS Applied Materials & Interfaces
Anastasiia A Pervishko, Mikhail I Baglai, Olle Eriksson, Dmitry Yudin
A keen interest towards technological implications of spin-orbit driven magnetization dynamics requests a proper theoretical description, especially in the context of a microscopic framework, to be developed. Indeed, magnetization dynamics is so far approached within Landau-Lifshitz-Gilbert equation which characterizes torques on magnetization on purely phenomenological grounds. Particularly, spin-orbit coupling does not respect spin conservation, leading thus to angular momentum transfer to lattice and damping as a result...
November 21, 2018: Scientific Reports
Chunxu Bai, Yanling Yang, Lin Bai
Here, we have theoretically studied the valley- and spin-resolved transport in a monolayer transition metal dichalcogenides based spin valve device, where both the Rashba spin orbit interaction and a gate voltage coexist in the central lead. In contrast to conventional semiconductor, nontrivial metallic states, such as, normal Rashba metal state (NRMS), anomalous Rashba metal state (ARMS), and Rashba ring metal state (RRMS), can be generated and manipulated by Rashba spin orbit interaction without the magnetic effect...
November 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Andrea Iorio, Mirko Rocci, Lennart Bours, Matteo Carrega, Valentina Zannier, Lucia Sorba, Stefano Roddaro, Francesco Giazotto, Elia Strambini
Semiconductor nanowires featuring strong spin-orbit interactions (SOI), represent a promising platform for a broad range of novel technologies, such as spintronic applications or topological quantum computation. However, experimental studies into the nature and the orientation of the SOI vector in these wires remain limited despite being of upmost importance. Typical devices feature the nanowires placed on top of a substrate which modifies the SOI vector and spoils the intrinsic symmetries of the system. In this work, we report experimental results on suspended InAs nanowires, in which the wire symmetries are fully preserved and clearly visible in transport measurements...
November 6, 2018: Nano Letters
Liyan Zhu, Tingting Zhang, Guibin Chen, Huabao Chen
We theoretically propose that Rashba-type band splitting can be achieved in binary alloyed hexagonal PX nanosheets (X = As, Sb, and Bi). The lack of inversion symmetry results in an effective electric field perpendicular to the basal plane of PX, hence, leading to Rashba-type spin-orbit coupling (SOC) in the two dimensional PX nanosheets. Since the SOC strength roughly scales quadratically with atomic number, the largest band splitting is found in PBi with a Rashba coefficient of ∼1.56 eV Å, which is a huge value among two-dimensional materials...
November 6, 2018: Physical Chemistry Chemical Physics: PCCP
Adrian G Swartz, Alfred K C Cheung, Hyeok Yoon, Zhuoyu Chen, Yasuyuki Hikita, Srinivas Raghu, Harold Y Hwang
We have examined the intrinsic spin-orbit coupling and orbital depairing in thin films of Nb-doped SrTiO_{3} by superconducting tunneling spectroscopy. The orbital depairing is geometrically suppressed in the two-dimensional limit, enabling a quantitative evaluation of the Fermi level spin-orbit scattering using Maki's theory. The response of the superconducting gap under in-plane magnetic fields demonstrates short spin-orbit scattering times τ_{so}≤1.1  ps. Analysis of the orbital depairing indicates that the heavy electron band contributes significantly to pairing...
October 19, 2018: Physical Review Letters
Ken-Ichi Uchida, Michiko Sasaki, Yuya Sakuraba, Ryo Iguchi, Shunsuke Daimon, Eiji Saitoh, Masahiro Goto
Conversion between spin and charge currents is essential in spintronics, since it enables spin-orbit-torque magnetization switching, spin-current-driven thermoelectric generation, and nano-scale thermal energy control. To realize efficient spin-charge conversion, a variety of mechanisms, including spin Hall effects, Rashba-Edelstein effects, and spin-momentum locking in topological insulators, have been investigated and more comprehensive material exploration is necessary. Here we demonstrate high-throughput screening of spin-charge conversion materials by means of the spin Peltier effect (SPE)...
October 30, 2018: Scientific Reports
Christopher Safranski, Eric A Montoya, Ilya N Krivorotov
Spin-orbit torques (SOTs) in multilayers of ferromagnetic (FM) and non-magnetic (NM) metals can manipulate the magnetization of the FM layer efficiently. This is employed, for example, in non-volatile magnetic memories for energy-efficient mobile electronics1,2 and spin torque nano-oscillators3-7 for neuromorphic computing8 . Recently, spin torque nano-oscillators also found use in microwave-assisted magnetic recording, which enables ultrahigh-capacity hard disk drives9 . Most SOT devices employ spin Hall10,11 and Rashba12 effects, which originate from spin-orbit coupling within the NM layer and at the FM/NM interfaces, respectively...
October 29, 2018: Nature Nanotechnology
Satoru Hayami, Yukitoshi Motome
We theoretically study noncoplanar spin textures in polar magnetic conductors. Starting from the Kondo lattice model with the Rashba spin-orbit coupling, we derive an effective spin model with generalized Ruderman-Kittel-Kasuya-Yosida interactions including the anisotropic and antisymmetric exchange interactions. By performing simulated annealing for the effective model, we find that a vortex crystal of Néel type is stabilized even in the absence of a magnetic field. Moreover, we demonstrate that a Bloch-type vortex crystal, which is usually associated with the Dresselhaus spin-orbit coupling, can also be realized in our Rashba-based model...
September 28, 2018: Physical Review Letters
Liying Zhang, Wei Qin, Leiqiang Li, Shunfang Li, Ping Cui, Yu Jia, Zhenyu Zhang
As a highly appealing new member of the two-dimensional (2D) materials family, stanene was first epitaxially grown on a three-dimensional topological insulator of Bi2Te3; yet, to date, a standing challenge is to drastically improve the overall quality of such stanene overlayers for a wide range of potential applications in next-generation quantum devices. Here we use state-of-the-art first-principles approaches to explore the atomistic growth mechanisms of stanene on different Bi2Te3(111)-based substrates, with intriguing discoveries...
October 18, 2018: Nanoscale
Yuan Ping, Jin Zhong Zhang
Spin is an intrinsic quantum mechanical property of fundamental particles including the electron. The spin property is intimately related to electronic and optical properties of molecules and materials. The combination of spin (magnetic), electronic, and optical properties of materials, such as organometal halide perovskites (OMHP), has attracted increasing attention, which has led to a new field termed spin-optotronics based on all three key properties. This growing field has implications in emerging technological applications across disciplines, including photonics, electronics, spintronics, quantum computation, and information storage...
October 18, 2018: Journal of Physical Chemistry Letters
Zhizhou Yu, Jian Chen, Lei Zhang, Yanxia Xing, Jian Wang
Manipulating the magnetization of ferromagnets by the current-induced spin-orbit torque has great potential application in the design of low energy consumption spintronic devices. Normally, an external magnetic field is needed for the reversal of current assisted magnetization by the spin-orbit torque. Recently, the switching of magnetization driven by the spin-orbit torque in the absence of an external magnetic field was reported in a Ta/Co20 Fe60 B20 /TaOx system with lateral structural asymmetry. To understand the physics behind this experiment, we performed first principles calculations on the potential profile at the interface between the ferromagnetic film and the wedge-shaped deposited metal oxide in the Ta/Co/TaO system...
October 21, 2018: Nanoscale
C-T Chou, N T Jacobson, J E Moussa, A D Baczewski, Y Chuang, C-Y Liu, J-Y Li, T M Lu
Gate-controllable spin-orbit coupling is often one requisite for spintronic devices. For practical spin field-effect transistors, another essential requirement is ballistic spin transport, where the spin precession length is shorter than the mean free path such that the gate-controlled spin precession is not randomized by disorder. In this letter, we report the observation of a gate-induced crossover from weak localization to weak anti-localization in the magneto-resistance of a high-mobility two-dimensional hole gas in a strained germanium quantum well...
November 15, 2018: Nanoscale
Jian Sun, Russell S Deacon, Rui Wang, Jun Yao, Charles M Lieber, Koji Ishibashi
Helical states, a prerequisite for the engineering of Majorana zero modes in solid-state systems, have recently been reported in the conduction band of III-V nanowires (NWs) subject to strong Rashba spin-orbit interaction. We report the observation of re-entrant conductance features consistent with the presence of helical hole states in multiple conduction modes of a Ge/Si core/shell NW. The Ge/Si system has several potential advantages over electron systems such as longer spin coherence time due to weaker coupling to nuclear spins and the possibility of isotope-purified materials for nuclear spin-free devices...
October 10, 2018: Nano Letters
I A Ado, A Qaiumzadeh, R A Duine, A Brataas, M Titov
Dzyaloshinskii-Moriya interaction (DMI) is investigated in a 2D ferromagnet (FM) with spin-orbit interaction of Rashba type at finite temperatures. The FM is described in the continuum limit by an effective s-d model with arbitrary dependence of spin-orbit coupling (SOC) and kinetic energy of itinerant electrons on the absolute value of momentum. In the limit of weak SOC, we derive a general expression for the DMI constant D from a microscopic analysis of the electronic grand potential. We compare D with the exchange stiffness A and show that, to the leading order in small SOC strength α_{R}, the conventional relation D=(4mα_{R}/ℏ)A, in general, does not hold beyond the Bychkov-Rashba model...
August 24, 2018: Physical Review Letters
Folkert K de Vries, Jie Shen, Rafal J Skolasinski, Michal P Nowak, Daniel Varjas, Lin Wang, Michael Wimmer, Joost Ridderbos, Floris A Zwanenburg, Ang Li, Sebastian Koelling, Marcel A Verheijen, Erik P A M Bakkers, Leo P Kouwenhoven
Low dimensional semiconducting structures with strong spin-orbit interaction (SOI) and induced superconductivity attracted great interest in the search for topological superconductors. Both the strong SOI and hard superconducting gap are directly related to the topological protection of the predicted Majorana bound states. Here we explore the one-dimensional hole gas in germanium silicon (Ge-Si) core-shell nanowires (NWs) as a new material candidate for creating a topological superconductor. Fitting multiple Andreev reflection measurements shows that the NW has two transport channels only, underlining its one-dimensionality...
October 10, 2018: Nano Letters
L Dell'Anna, P Majari, M R Setare
We calculate the transmission coefficient for a particle crossing a potential barrier in monolayer graphene with Rashba spin-orbit coupling and in bilayer graphene. We show that in both cases one can go from Klein tunneling regime, characterized by perfect normal transmission, to anti-Klein tunneling regime, with perfect normal reflection, by tuning the Rashba spin-orbit coupling for a monolayer or the interplane coupling for a bilayer graphene. We show that the intermediate regime is characterized by a non-monotonic behavior with oscillations and resonances in the normal transmission amplitude as a function of the coupling and of the potential parameters...
October 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Cong Xiao, Bangguo Xiong, Fei Xue
In model studies of the spin/anomalous Hall effect, effective Hamiltonians often serve as the starting point. However, a complete effective quantum theory contains not only the effective Hamiltonian but also the relation linking the physical observables to the canonical ones. In this work we construct the semiclassical Boltzmann transport framework in the weak disorder-potential regime directly in the level of the effective quantum theory, and confirm this construction by formulating a generalized Kohn-Luttinger density matrix transport theory also in this level...
October 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
E Marcellina, A Srinivasan, D S Miserev, A F Croxall, D A Ritchie, I Farrer, O P Sushkov, Dimitrie Culcer, A R Hamilton
Semiconductor holes with strong spin-orbit coupling allow all-electrical spin control, with broad applications ranging from spintronics to quantum computation. Using a two-dimensional hole system in a gallium arsenide quantum well, we demonstrate a new mechanism of electrically controlling the Zeeman splitting, which is achieved through altering the hole wave vector k. We find a threefold enhancement of the in-plane g-factor g_{∥}(k). We introduce a new method for quantifying the Zeeman splitting from magnetoresistance measurements, since the conventional tilted field approach fails for two-dimensional systems with strong spin-orbit coupling...
August 17, 2018: Physical Review Letters
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