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https://read.qxmd.com/read/30873689/theoretical-prediction-of-chiral-3d-hybrid-organic-inorganic-perovskites
#1
Guankui Long, Yecheng Zhou, Mingtao Zhang, Randy Sabatini, Abdullah Rasmita, Li Huang, Girish Lakhwani, Weibo Gao
Hybrid organic-inorganic perovskites (HOIPs), in particular 3D HOIPs, have demonstrated remarkable properties, including ultralong charge-carrier diffusion lengths, high dielectric constants, low trap densities, tunable absorption and emission wavelengths, strong spin-orbit coupling, and large Rashba splitting. These superior properties have generated intensive research interest in HOIPs for high-performance optoelectronics and spintronics. Here, 3D hybrid organic-inorganic perovskites that implant chirality through introducing the chiral methylammonium cation are demonstrated...
March 15, 2019: Advanced Materials
https://read.qxmd.com/read/30822763/charge-and-spin-transport-on-surfaces-and-atomic-layers-measured-by-multi-probe-techniques
#2
Shuji Hasegawa
Thanks to advances in in situ measurement techniques for electrical transport in ultra-high vacuum together with emergent materials such as Rashba-type surfaces, topological insulators, atomic-layer superconductors, and two-dimensional materials like graphene, surface states and edge states on crystals provide intriguing topics, e.g., dissipation-less currents, spin-polarized electric current, and pure spin current. This is due to broken symmetry and strong spin-orbit and electron-phonon interactions. Here we review some examples of experimental techniques of multi-probe methods at macroscopic and microscopic scales, followed by transport phenomena revealed by them...
March 1, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://read.qxmd.com/read/30796227/uncovering-and-tailoring-hidden-rashba-spin-orbit-splitting-in-centrosymmetric-crystals
#3
Linding Yuan, Qihang Liu, Xiuwen Zhang, Jun-Wei Luo, Shu-Shen Li, Alex Zunger
Hidden Rashba and Dresselhaus spin splittings in centrosymmetric crystals with subunits/sectors having non-centrosymmetric symmetries (the R-2 and D-2 effects) have been predicted theoretically and then observed experimentally, but the microscopic mechanism remains unclear. Here we demonstrate that the spin splitting in the R-2 effect is enforced by specific symmetries, such as non-symmorphic symmetry in the present example, which ensures that the pertinent spin wavefunctions segregate spatially on just one of the two inversion-partner sectors and thus avoid compensation...
February 22, 2019: Nature Communications
https://read.qxmd.com/read/30776790/spin-orbit-split-two-dimensional-states-of-bitei-au-111-interfaces
#4
Nikolay Zaitsev, Ralf Tonner, Ilya A Nechaev
We present an ab initio study of interfaces formed by placing a single trilayer of BiTeI on the Au(111) surface. We consider two possible interfaces with the parallel and antiparallel orientation of the trilayer dipole moment with respect to the surface normal, i.e., Te-Bi-I/Au(111) and I-Bi-Te/Au(111). We show that the resulting interface state that originates from the modified spin-orbit split surface state of the clean Au(111) surface resides at high energy above the Fermi level and acquires a large spin-splitting and reversal helicity as compared with the original surface state...
February 18, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://read.qxmd.com/read/30775772/monolayer-tellurenyne-assembled-with-helical-telluryne-structure-and-transport-properties
#5
Liujian Qi, Jie Han, Wang Gao, Qing Jiang
Two-dimensional (2D) crystals are candidate materials for electronics and spintronics, but their deficient carrier mobility, inappreciable spin-orbit coupling effect, and environmental instability have such limited applications. Herein, using density functional theory methods, we propose a novel 2D monolayer material, named tellurenyne, built with an atomic tellurium chain (named telluryne) via a noncovalent bond. The comparable electrostatic and van der Waals contributions to interchain binding enable tellurenyne to exhibit remarkable stabilities and transport properties...
February 18, 2019: Nanoscale
https://read.qxmd.com/read/30760759/spin-momentum-locked-spin-manipulation-in-a-two-dimensional-rashba-system
#6
Makoto Kohda, Takanori Okayasu, Junsaku Nitta
Spin-momentum locking, which constrains spin orientation perpendicular to electron momentum, is attracting considerable interest for exploring various spin functionalities in semiconductors and topological materials. Efficient spin generation and spin detection have been demonstrated using the induced helical spin texture. Nevertheless, spin manipulation by spin-momentum locking remains a missing piece because, once bias voltage is applied to induce the current flow, the spin orientation must be locked by the electron momentum direction, thereby rendering spin phase control difficult...
February 13, 2019: Scientific Reports
https://read.qxmd.com/read/30679442/unique-spin-vortices-and-topological-charges-in-quantum-dots-with-spin-orbit-couplings
#7
Wenchen Luo, Amin Naseri, Jesko Sirker, Tapash Chakraborty
Spin textures of one or two electrons in a quantum dot with Rashba or Dresselhaus spin-orbit couplings reveal several intriguing properties. We show here that even at the single-electron level stable spin vortices with tunable topological charges exist. These topological textures appear in the ground state of the dots. The textures are stabilized by time-reversal symmetry breaking and are robust against the eccentricity of the dot. The topological charge is directly related to the sign of the z component of the spin in a large dot, allowing a direct probe of its topological properties...
January 24, 2019: Scientific Reports
https://read.qxmd.com/read/30671577/topologically-nontrivial-phase-and-tunable-rashba-effect-in-half-oxidized-bismuthene
#8
Ming-Yang Liu, Qing-Yuan Chen, Chao Cao, Yao He
Bismuth based (Bi-based) materials exhibit promising potential for the study of two-dimensional (2D) topological insulators or quantum spin Hall (QSH) insulators due to their intrinsic strong spin-orbit coupling (SOC). Herein, we theoretically propose a new inversion-asymmetry topological phase with tunable Rashba effect in a 2D bismuthene monolayer, which is driven by the sublattices half-oxidation (SHO). The nontrivial topology is identified by the SHO induced p-p band inversion at the Γ point, the Z2 topological number, and the metallic edge states...
January 23, 2019: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/30665202/modified-exchange-interaction-between-magnetic-impurities-in-spin-orbit-coupled-quantum-wires
#9
Joelson Fernandes Silva, Edson Vernek
Indirect exchange interaction between magnetic impurities in one dimensional
 systems is a matter of long discussions since Kittel has established that in the asymptotic limit
 it decays as the inverse of distance x between the impurities. In this work we investigate
 this problem in a quantum wire with Rashba spin-orbit coupling (SOC). By employing a
 second order perturbation theory we find that one additional oscillatory term appears in each of
 the RKKY, the Dzaloshinkii-Moryia and the Ising couplings...
January 21, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://read.qxmd.com/read/30625452/conductance-quantisation-in-patterned-gate-in-sub-0-75-sub-ga-sub-0-25-sub-as-structures-up-to-6%C3%A3-2e-sup-2-sup-h
#10
Yilmaz Gul, Graham Creeth, David English, Stuart N Holmes, Kalarikad Thomas, Ian Farrer, David J P Ellis, David A Ritchie, Michael Pepper
We present electrical measurements from In0.75Ga0.25As 1-dimensional channel devices with Rashba-type, spin-orbit coupling present in the 2-dimensional contact regions. Suppressed backscattering as a result of the time-reversal asymmetry at the 1-dimensional channel entrance results in enhanced ballistic transport characteristics with clear quantised conductance plateaus up to 6×(2e2/h). Applying D.C. voltages between the source and drain ohmic contacts and an in-plane magnetic field confirms a ballistic transport picture...
January 9, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://read.qxmd.com/read/30608825/hybridization-of-subgap-states-in-one-dimensional-superconductor-semiconductor-coulomb-islands
#11
E C T O'Farrell, A C C Drachmann, M Hell, A Fornieri, A M Whiticar, E B Hansen, S Gronin, G C Gardner, C Thomas, M J Manfra, K Flensberg, C M Marcus, F Nichele
We present measurements of one-dimensional superconductor-semiconductor Coulomb islands, fabricated by gate confinement of a two-dimensional InAs heterostructure with an epitaxial Al layer. When tuned via electrostatic side gates to regimes without subgap states, Coulomb blockade reveals Cooper-pair mediated transport. When subgap states are present, Coulomb peak positions and heights oscillate in a correlated way with magnetic field and gate voltage, as predicted theoretically, with (anti)crossings in (parallel) transverse magnetic field indicating Rashba-type spin-orbit coupling...
December 21, 2018: Physical Review Letters
https://read.qxmd.com/read/30608710/room-temperature-spin-hall-effect-in-graphene-mos-2-van-der-waals-heterostructures
#12
C K Safeer, Josep Ingla-Aynés, Franz Herling, Jose Hugo Garcia Aguilar, Marc Vila, Nerea Ontoso, M Reyes Calvo, Stephan Roche, Luis E Hueso, Fèlix Casanova
Graphene is an excellent material for long distance spin transport but allows little spin manipulation. Transition metal dichalcogenides imprint their strong spin-orbit coupling into graphene via proximity effect, and it has been predicted that efficient spin-to-charge conversion due to spin Hall and Rashba-Edelstein effects could be achieved. Here, by combining Hall probes with ferromagnetic electrodes, we unambiguously demonstrate experimentally spin Hall effect in graphene induced by MoS2 proximity and for varying temperature up to room temperature...
January 4, 2019: Nano Letters
https://read.qxmd.com/read/30604953/unusual-electric-and-optical-tuning-to-ktao3-based-two-dimensional-electron-gases-with-5d-orbitals
#13
Hui Zhang, Xi Yan, Xuejing Zhang, Shuai Wang, Changmin Xiong, Hongrui Zhang, Shaojin Qi, Jine Zhang, Furong Han, Ning Wu, Bang-Gui Liu, Yuansha Chen, BaoGen Shen, JiRong Sun
Controlling electronic processes in low dimension electron system is centrally important for both fundamental and applied researches. While most of the previous works focused on SrTiO3-based two-dimensional electron gases (2DEGs), here we report on a comprehensive investigation in this regard for amorphous-LaAlO3/KTaO3 2DEGs with the Fermi energy ranging from ~13 meV to ~488 meV. The most important observation is the dramatic variation of the Rashba spin-orbit coupling (SOC) as Fermi energy sweeps through 313 meV: The SOC effective field first jumps and then drops, leading to a cusp of ~2...
January 3, 2019: ACS Nano
https://read.qxmd.com/read/30565590/symmetry-breaking-induced-large-piezoelectricity-in-janus-tellurene-materials
#14
Yu Chen, Junyi Liu, Jiabing Yu, Yaguang Guo, Qiang Sun
Structural symmetry-breaking can lead to novel electronic and piezoelectric properties in two-dimensional (2D) materials. In this paper, we propose a 2D Janus tellurene (Te2Se) monolayer with asymmetric Se/Te surfaces and its derived multilayer structures. The band structure calculations show that the 2D Janus Te2Se monolayer is an indirect gap semiconductor, and the intrinsic mirror asymmetry combined with the spin-orbit coupling induces the Rashba spin splitting and the out-of-plane spin polarization. Moreover, the absence of both the inversion symmetry and out-of-plane mirror symmetry, together with flexible mechanical properties, results in large in-plane and out-of-plane piezoelectric coefficients that are valuable in 2D piezoelectric materials...
December 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/30511866/weak-antilocalization-at-the-atomic-scale-limit-of-metal-film-thickness
#15
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
https://read.qxmd.com/read/30474373/strain-tuned-topological-insulator-and-rashba-induced-anisotropic-momentum-locked-dirac-cones-in-two-dimensional-sete-monolayer
#16
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
https://read.qxmd.com/read/30464318/another-view-on-gilbert-damping-in-two-dimensional-ferromagnets
#17
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
https://read.qxmd.com/read/30431019/giant-magnetoresistance-control-and-nontrivial-metallic-state-manipulation-in-a-transition-metal-dichalcogenide-spin-valve-using-a-gate-voltage
#18
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
https://read.qxmd.com/read/30398889/vectorial-control-of-the-spin-orbit-interaction-in-suspended-inas-nanowires
#19
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
https://read.qxmd.com/read/30398502/huge-rashba-type-spin-orbit-coupling-in-binary-hexagonal-px-nanosheets-x-as-sb-and-bi
#20
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
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