scholarly journals Orbital mapping of energy bands and the truncated spin polarization in three-dimensional Rashba semiconductors

2016 ◽  
Vol 94 (12) ◽  
Author(s):  
Qihang Liu ◽  
Xiuwen Zhang ◽  
J. A. Waugh ◽  
D. S. Dessau ◽  
Alex Zunger
Keyword(s):  
Spin Polarization ◽  
Three Dimensional ◽  
Energy Bands ◽  
Orbital Mapping

scholarly journals A Supersymmetric Hierarchical Model for Weakly Disordered 3d Semimetals

2020 ◽  
Vol 21 (11) ◽  
pp. 3499-3574
Author(s):  
Giovanni Antinucci ◽  
Luca Fresta ◽  
Marcello Porta
Keyword(s):  
Multiscale Analysis ◽  
Three Dimensional ◽  
Quantum Systems ◽  
Supersymmetric Model ◽  
Energy Bands ◽  
Algebraic Decay ◽  
Group Methods ◽  
Point Correlation ◽  
Point Correlation Function ◽  
Renormalization Group Methods

Abstract In this paper, we study a hierarchical supersymmetric model for a class of gapless, three-dimensional, weakly disordered quantum systems, displaying pointlike Fermi surface and conical intersections of the energy bands in the absence of disorder. We use rigorous renormalization group methods and supersymmetry to compute the correlation functions of the system. We prove algebraic decay of the two-point correlation function, compatible with delocalization. A main technical ingredient is the multiscale analysis of massless bosonic Gaussian integrations with purely imaginary covariances, performed via iterative stationary phase expansions.

Interchain Interaction in Quasi-One-Dimension Organic Polymer Ferromagnets

1997 ◽  
Vol 11 (19) ◽  
pp. 821-827
Author(s):  
Hong-Tao Li
Keyword(s):  
Energy Gap ◽  
Mean Field ◽  
Three Dimensional ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Organic Polymer ◽  
Interchain Interaction ◽  
Energy Bands ◽  
Interchain Coupling ◽  
Organic Ferromagnets

A theoretical model is developed to describe quasi-one-dimensional organic ferromagnets after considering the interchain interaction as an interchain electron-transfer. By employing the mean-field approximation, four energy bands which exhibit three-dimensional anisotropic aspect are obtained. When the interchain coupling increases, the energy gap decreases. In the case of small dimerization order parameter, due to the interchain coupling, the band gap may disappear and the conjugated π-electrons in the main chain show ferromagnetic order in the ground state.

Basics of Crystal Structure and Band Structure

2020 ◽  
pp. 3-28
Author(s):  
Igor Vurgaftman ◽  
Matthew P. Lumb ◽  
Jerry R. Meyer
Keyword(s):  
Crystal Structure ◽  
Band Structure ◽  
Crystal Lattice ◽  
Three Dimensional ◽  
Energy Bands ◽  
Crystalline Structures ◽  
Semiconductor Crystals

III–V semiconductors form crystalline structures with three-dimensional periodic arrangements of the atoms. In this chapter, we will explore the nature of the crystal lattice starting from lower dimensions and progressing to real semiconductor crystals. We also learn why we expect distinct energy bands to form in the solids that crystallize in such lattices. The carrier statistics and occupation of the bands will also be examined.

The spin polarization and transport properties at the surface of a three-dimensional topological insulator

2015 ◽  
Vol 206 ◽  
pp. 31-37 ◽  
Author(s):  
Jian-Hui Yuan ◽  
Yan Zhang ◽  
Xinxia Guo ◽  
Jinjin Zhang ◽  
Hua Mo
Keyword(s):  
Transport Properties ◽  
Spin Polarization ◽  
Topological Insulator ◽  
Three Dimensional

scholarly journals Very efficient spin polarization analysis (VESPA): new exchange scattering-based setup for spin-resolved ARPES at APE-NFFA beamline at Elettra

2017 ◽  
Vol 24 (4) ◽  
pp. 750-756 ◽  
Author(s):  
Chiara Bigi ◽  
Pranab K. Das ◽  
Davide Benedetti ◽  
Federico Salvador ◽  
Damjan Krizmancic ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Exchange Coupling ◽  
Three Dimensional ◽  
Polarization Analysis ◽  
High Demand ◽  
Final State ◽  
Strong Electron ◽  
Spin Correlations ◽  
Exchange Scattering ◽  
Full Quantum

Complete photoemission experiments, enabling measurement of the full quantum set of the photoelectron final state, are in high demand for studying materials and nanostructures whose properties are determined by strong electron and spin correlations. Here the implementation of the new spin polarimeter VESPA (Very Efficient Spin Polarization Analysis) at the APE-NFFA beamline at Elettra is reported, which is based on the exchange coupling between the photoelectron spin and a ferromagnetic surface in a reflectometry setup. The system was designed to be integrated with a dedicated Scienta-Omicron DA30 electron energy analyzer allowing for two simultaneous reflectometry measurements, along perpendicular axes, that, after magnetization switching of the two targets, allow the three-dimensional vectorial reconstruction of the spin polarization to be performed while operating the DA30 in high-resolution mode. VESPA represents the very first installation for spin-resolved ARPES (SPARPES) at the Elettra synchrotron in Trieste, and is being heavily exploited by SPARPES users since autumn 2015.

scholarly journals Band splitting with vanishing spin polarizations in noncentrosymmetric crystals

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Kai Liu ◽  
Wei Luo ◽  
Junyi Ji ◽  
Paolo Barone ◽  
Silvia Picozzi ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Orbit Coupling ◽  
High Symmetry ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Energy Bands ◽  
Solid State Physics ◽  
Bulk Gaas ◽  
Spintronic Devices ◽  
Band Splitting

Abstract The Dresselhaus and Rashba effects are well-known phenomena in solid-state physics, in which spin–orbit coupling splits spin-up and spin-down energy bands of nonmagnetic non-centrosymmetric crystals. Here, we discuss a phenomenon we dub band splitting with vanishing spin polarizations (BSVSP), in which, as usual, spin-orbit coupling splits the energy bands in nonmagnetic non-centrosymmetric systems. Surprisingly, however, both split bands show no net spin polarization along certain high-symmetry lines in the Brillouin zone. In order to rationalize this phenomenon, we propose a classification of point groups into pseudo-polar and non-pseudo-polar groups. By means of first-principles simulations, we demonstrate that BSVSP can take place in both symmorphic (e.g., bulk GaAs) and non-symmorphic systems (e.g., two dimensional ferroelectric SnTe). Furthermore, we identify a linear magnetoelectric coupling in reciprocal space, which could be employed to tune the spin polarization with an external electric field. The BSVSP effect and its manipulation could therefore form the basis for future spintronic devices.

scholarly journals On the understanding of current-induced spin polarization of three-dimensional topological insulators

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Jifa Tian ◽  
Seokmin Hong ◽  
Shehrin Sayed ◽  
Joon Sue Lee ◽  
Supriyo Datta ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Topological Insulators ◽  
Three Dimensional
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