نتایج جستجو برای: rashba

تعداد نتایج: 1979  

2014
Jinling Yu Shuying Cheng Yunfeng Lai Qiao Zheng Yonghai Chen

: Spin photocurrent spectra induced by Rashba- and Dresselhaus-type circular photogalvanic effect (CPGE) at inter-band excitation have been experimentally investigated in InGaAs/GaAs/AlGaAs step quantum wells (QWs) at room temperature. The Rashba- and Dresselhaus-induced CPGE spectra are quite similar with each other during the spectral region corresponding to the transition of the excitonic st...

2014
Manuel Laubach Johannes Reuther Ronny Thomale Stephan Rachel

Spin-orbit (SO) coupling is the crucial parameter to drive topological insulating phases in electronic band models. In particular, the generic emergence of SO coupling involves the Rashba term which fully breaks the SU(2) spin symmetry. As soon as interactions are taken into account, however, many theoretical studies have to content themselves with the analysis of a simplified U(1) conserving S...

Journal: :New journal of physics 2016
D L Campbell I B Spielman

We theoretically explore a Rashba spin-orbit coupling scheme which operates entirely in the absolute ground state manifold of an alkali atom, thereby minimizing all inelastic processes. An energy gap between ground eigenstates of the proposed coupling can be continuously opened or closed by modifying laser polarizations. Our technique uses far-detuned 'Raman' laser coupling to create the Rashba...

2005
DARIO BERCIOUX MICHELE GOVERNALE VITTORIO CATAUDELLA VINCENZO MARIGLIANO RAMAGLIA

We use a simple formalism to calculate the conductance of any quantum network consisting of single-channel one-dimensional quantum wires in the presence of Rashba spin-orbit coupling and a coupling magnetic field. We show that the Rashba effect may give rise to an electron localization phenomenon similar to the Aharonov–Bohm effect. This localization effect can be attributed to spin precession ...

Journal: :Physical review letters 2014
Rai Moriya Kentarou Sawano Yusuke Hoshi Satoru Masubuchi Yasuhiro Shiraki Andreas Wild Christian Neumann Gerhard Abstreiter Dominique Bougeard Takaaki Koga Tomoki Machida

The spin-orbit interaction (SOI) of a two-dimensional hole gas in the inversion symmetric semiconductor Ge is studied in a strained-Ge/SiGe quantum well structure. We observe weak antilocalization (WAL) in the magnetoconductivity measurement, revealing that the WAL feature can be fully described by the k-cubic Rashba SOI theory. Furthermore, we demonstrate electric field control of the Rashba S...

2008
Shu-Shen Li Jian-Bai Xia

The Rashba spin-orbit splitting of a hydrogenic donor impurity in GaAs/GaAlAs quantum wells is investigated theoretically in the framework of effective-mass envelope function theory. The Rashba effect near the interface between GaAs and GaAlAs is assumed to be a linear relation with the distance from the quantum well side. We find that the splitting energy of the excited state is larger and les...

2011
M. Magdalena Gelabert Llorenç Serra

We present calculations of the g factors for the lower conductance steps of three-dimensional hole quantum wires. Our results prove that the anisotropy with magnetic field orientation, relative to the wire, originates in the Rashba spin-orbit coupling. We also analyze the relevance of the deformation, as the wire evolves from three-dimensional toward a flat two-dimensional geometry. For high en...

Journal: :Physical review letters 2011
Jukka I Väyrynen Teemu Ojanen

We study the effects of a gate-controlled Rashba spin-orbit coupling to quantum spin Hall edge states in HgTe quantum wells. A uniform Rashba coupling can be employed in tuning the spin orientation of the edge states while preserving the time-reversal symmetry. We introduce a sample geometry where the Rashba coupling can be used in probing helicity by purely electrical means without requiring s...

2014
Christopher John Butler Hung-Hsiang Yang Jhen-Yong Hong Shih-Hao Hsu Raman Sankar Chun-I Lu Hsin-Yu Lu Kui-Hon Ou Yang Hung-Wei Shiu Chia-Hao Chen Chao-Cheng Kaun Guo-Jiun Shu Fang-Cheng Chou Minn-Tsong Lin

Surfaces of semiconductors with strong spin-orbit coupling are of great interest for use in spintronic devices exploiting the Rashba effect. BiTeI features large Rashba-type spin splitting in both valence and conduction bands. Either can be shifted towards the Fermi level by surface band bending induced by the two possible polar terminations, making Rashba spin-split electron or hole bands elec...

Journal: :Computer Physics Communications 2016
Hang Xie Feng Jiang Wei E. I. Sha

Numerical methods are developed in the quantum transport calculations for electron in the waveguides with spin–orbital (Rashba) interaction. The methods are based on a hybrid mode-matching scheme in which the wavefunctions are expressed as the superposition of eigenmodes in the lead regions and in the device region the wavefunction is expressed on the discrete basis. Two versions are presented ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید