TRANSPORT THROUGH INTERACTING AHARONOV–BOHM–CASHER INTERFEROMETERS

2011 ◽  
Vol 25 (22) ◽  
pp. 3019-3025
Author(s):  
QING-QIANG XU ◽  
BEN-LING GAO ◽  
SHI-JIE XIONG
Keyword(s):  
Magnetic Flux ◽  
Electronic Transport ◽  
Transport Processes ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Spin Filter ◽  
Rashba Spin ◽  
Mesoscopic Ring ◽  
Universal Regime ◽  
Aharonov Bohm

We investigate the transport properties of an interacting ring threaded by a magnetic flux and with Rashba spin-orbit coupling, based on a recently developed functional renormalized group technique. In the calculations of the electronic transport processes, the Coloumb On-site interactions are taken into account. For an interacting ring connected to two leads, we find that (i) for ΦAC = 0, the behavior of transmission zero at ΦAB = π is generic for the universal regime; (ii) for certain ΦAC and ΦAB, one can use the mesoscopic ring as spin filter even in the presence of the local interaction in the ring.

SPIN ROTATION AND POLARIZATION OF TRANSPORT ELECTRONS THROUGH A THREE-ELECTRODE AHARONOV–BOHM RING WITH SPIN-ORBIT COUPLING

2008 ◽  
Vol 22 (17) ◽  
pp. 1661-1672
Author(s):  
HONG-MING FEI ◽  
ZHI-JIAN LI ◽  
YI-HANG NIE ◽  
JIU-QING LIANG
Keyword(s):  
Orbit Interaction ◽  
Spin Rotation ◽  
Input State ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Spin Filter ◽  
Rashba Spin ◽  
S Matrix ◽  
Aharonov Bohm ◽  
Ab Ring

The quantum transport of electrons through a three-lead ballistic Aharonov–Bohm (AB) ring with the Rashba spin-orbit interaction is revisited in terms of the S-matrix method from which the transmission probabilities are obtained analytically. It is shown that this mesoscopic device indeed can act as a spin-filter resulting in a relative spin-rotation between the input and output states while can act as a spin polarizer or splitter for a completely unpolarized, mixture input-state. In contrast with the result of Griffith's boundary conditions, the backscattering of carriers on the junction does not allow this three-terminal device to have unit efficiency. In addition, we point out that the AB ring with two symmetrically situated output leads also can give rise to the redistribution of the outgoing currents with respect to the variation of magnetic flux.

The Coherent Transport Properties of Electrons in a 4-Terminal Nano Device with Rashba Spin-Orbit Coupling in the Presence of Magnetic Field

2012 ◽  
Vol 496 ◽  
pp. 175-180
Author(s):  
Hui Xian Wang ◽  
Li Ben Li ◽  
Da Wei Kang ◽  
Hui Hui Liu
Keyword(s):  
Magnetic Flux ◽  
Transport Properties ◽  
Coupling Strength ◽  
Quantum Wires ◽  
Channel Structure ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Coherent Transport ◽  
Rashba Spin ◽  
Magnetic Filed

We investigate the coherent transport properties of electrons in a side terminal of a four-terminal nano device made of quantum wires with Rashba spin-orbit (SO) coupling in the presence of magnetic filed. We numerically calculate the charge and spin conductances dependent on SO coupling strength and reduced flux. The results imply that the coherent transport in this device is determined by the interplay of Rashba SO coupling and magnetic filed. For specific values of magnetic flux and SO coupling strength, a complete blocking can take place. It also shows that there is a de-blocking phenomenon induced by the interplay of magnetic flux and SO coupling. Such a 4-terminal and multi-channel structure may provide more options of controlling methods for the coherent charge and spin transport.

ELECTRON TRANSPORT THROUGH A MESOSCOPIC DEVICE WITH THE SPIN-ORBIT COUPLING SEMICONDUCTOR LEADS

2011 ◽  
Vol 25 (12) ◽  
pp. 1671-1680 ◽  
Author(s):  
SHU-GUANG CHENG ◽  
XIAO-JUAN ZHAO ◽  
PEI ZHAO
Keyword(s):  
Electron Transport ◽  
Electronic Transport ◽  
Function Method ◽  
Orbit Interaction ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Rashba Spin ◽  
Non Equilibrium Green’S Function ◽  
Linear Conductance

The electronic transport through a mesoscopic confining region coupled to two spin-orbit coupling semiconductor leads is studied. We mainly focus on how the transport behaviors are affected by the Rashba spin-orbit interaction (SOI), which has been neglected in the previous theoretical papers but indeed exists in the semiconductor leads from the recent experimental results. By using Landauer–Büttiker formula and the non-equilibrium Green's function method, the linear conductance of this device is obtained. The numerical results exhibit that the conductance are similar for the two cases of the absence and the presence of the SOI. It means that the SOI in the leads does not qualitatively affects the transport behaviors. However, in detail, the peaks of the conductance are widened and enhanced by the SOI. In some specific cases, the widening and the enhancement could be very strong.

SPIN-COHERENT TRANSPORT IN MESOSCOPIC INTERFERENCE DEVICE

NANO ◽  
2007 ◽  
Vol 02 (06) ◽  
pp. 389-392 ◽  
Author(s):  
WALID A. ZEIN ◽  
ADEL H. PHILLIPS ◽  
OMAR A. OMAR
Keyword(s):  
Quantum Dot ◽  
Size Effect ◽  
Tunnel Barrier ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Intrinsic Parameters ◽  
Coherent Transport ◽  
Quantum Size ◽  
Mesoscopic Ring ◽  
Aharonov Bohm

We investigate the quantum size effect in the phase coherent mesoscopic ring. A quantum dot is embedded in one arm and it is connected to one lead via tunnel barrier. Both Aharonov–Casher and Aharonov–Bohm effects are studied. A spin-dependent conductance has been deduced and it depends on the intrinsic parameters. Our results show that the strength of spin-orbit coupling depends on the size of the present device. This investigation is valuable for fabricating such spintronics devices.

Electron spin filter based on Rashba spin-orbit coupling

2006 ◽  
Vol 89 (17) ◽  
pp. 172115 ◽  
Author(s):  
A. W. Cummings ◽  
R. Akis ◽  
D. K. Ferry
Keyword(s):  
Electron Spin ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Spin Filter ◽  
Rashba Spin

Proposal of a Novel Spin Filter Realized in a Triple Barrier Resonant Tunnel Diode using Rashba Spin-Orbit Interaction

2001 ◽  
Vol 690 ◽  
Author(s):  
Takaaki Koga ◽  
Junsaku Nitta ◽  
Supriyo Datta ◽  
Hideaki Takayanagi
Keyword(s):  
Quantum Well ◽  
Resonant Tunneling ◽  
Orbit Interaction ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Spin Filter ◽  
Electronic Spin ◽  
Rashba Spin ◽  
Resonant Tunnel ◽  
Spin Diode

ABSTRACTA spin rectifying diode, which utilizes Rashba spin-orbit coupling, is proposed using semiconducting triple barrier structures. This spin diode makes use of spin-dependent resonant tunneling levels that are formed in the triple barrier structures. We found that, for a certain emitter-collector bias voltage, it is possible to engineer the structure in such a way that a resonant l evel formed within the first quantum well matches that of the second quantum well only for a selected spin state, thus realizing an electronic spin rectifier. The calculated spin polarization of the transmitted current through the device, which is defined as I↑–I↓/(I↑+I↓), is found to be higher than 99.9%.

Sign in / Sign up

Export Citation Format

Share Document