Spin transport in two-dimensional hopping systems

Spin-polarized transport in low-dimensional systems

Quasi-two-dimensional spin transport wire

We demonstrate that in an inversion-asymmetric quasi-two-dimensional electron system (quasi2DES) with both Rashba and Dresselhaus spin-orbit couplings at present, certain transport directions on which no spin precession occurs can be found when the injected spin is properly polarized. By analyzing the expectation value of spin with respect the injected electron state on each space point in the ...

Nonlinear spin-thermoelectric transport in two-dimensional topological insulators

Sun-Yong Hwang,1,2 Rosa López,1,3 Minchul Lee,4 and David Sánchez1,3 1Institut de Fı́sica Interdisciplinària i Sistemes Complexos IFISC (CSIC-UIB), E-07122 Palma de Mallorca, Spain 2Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea 3Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030, USA 4Department of Applied Physic...

Ballistic spin transport in a two-dimensional electron gas

We explore electrically injected, spin-polarized transport in a ballistic two-dimensional electron gas. We augment the Büttiker-Landauer picture with a simple, but realistic model for spin-selective contacts to describe multimode reservoir-to-reservoir transport of ballistic spin-1/2 particles. Clear and unambiguous signatures of spin transport are established in this regime, for the simplest m...

Transport in quasi one-dimensional spin-1/2 systems

We present numerical results for the spin and thermal conductivity of one-dimensional (1D) quantum spin systems. We contrast the properties of integrable models such as the spin-1/2 XXZ chain against nonintegrable ones such as frustrated and dimerized chains. The thermal conductivity of the XXZ chain is ballistic at finite temperatures, while in the nonintegrable models, this quantity is argued...