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We investigate linear and non-linear transport in a double quantum dot system weakly coupled to spin-polarized leads. In the linear regime, the conductance as well as the non-equilibrium spin accumulation are evaluated in analytic form. The…

Mesoscale and Nanoscale Physics · Physics 2008-07-01 Ralph Peter Hornberger , Sonja Koller , Georg Begemann , Andrea Donarini , Milena Grifoni

We study the electronic transport through a noncollinear single-electron spin-valve transistor. It consists of a small metallic island weakly coupled to two ferromagnetic leads with noncollinear magnetization directions. The electric…

Mesoscale and Nanoscale Physics · Physics 2011-12-13 Stephan Lindebaum , Jürgen König

We theoretically propose the long-range spin transport mediated by the gapless surface states of topological Dirac semimetal (TDSM). Low-dissipation spin current is a building block of next-generation spintronics devices. While conduction…

Mesoscale and Nanoscale Physics · Physics 2021-06-30 Yasufumi Araki , Takahiro Misawa , Kentaro Nomura

When a beam of light is laterally confined, its field distribution can exhibit points where the local magnetic and electric field vectors spin in a plane containing the propagation direction of the electromagnetic wave. The phenomenon…

Optics · Physics 2018-05-23 Martin Neugebauer , Jörg Eismann , Thomas Bauer , Peter Banzer

Spin-polarized transport through a double quantum dot system attached to a common superconducting lead and two ferromagnetic electrodes (fork geometry) is investigated theoretically. The key objective of the analysis is to describe the…

Mesoscale and Nanoscale Physics · Physics 2014-09-16 Piotr Trocha , Józef Barnaś

This article reviews spin-dependent transport of carriers in homogenous three-dimensional and two-dimensional semiconductors. We begin with a discussion of optical orientation of electron spins, which allows both the creation and detection…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 R. Winkler

We present a semiclassical theory of spin-diffusion in a ferromagnetic metal subject to a temperature gradient. Spin-flip scattering can generate pure thermal spin currents by short-circuiting spin channels while suppressing spin…

Mesoscale and Nanoscale Physics · Physics 2015-05-14 Moosa Hatami , Gerrit E. W. Bauer , Saburo Takahashi , Sadamichi Maekawa

Dynamical mean field theory is employed to calculate the properties of multilayered inhomogeneous devices composed of semi-infinite metallic lead layers coupled via barrier planes that are made from a strongly correlated material (and can…

Strongly Correlated Electrons · Physics 2009-11-10 J. K. Freericks

The classical drift diffusion (DD) model of spin transport treats spin relaxation via an empirical parameter known as the ``spin diffusion length''. According to this model, the ensemble averaged spin of electrons drifting and diffusing in…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Sandipan Pramanik , Supriyo Bandyopadhyay , Marc Cahay

We consider the problem of tunneling between two leads via a localized spin 1/2 or any other microscopic system which can be modeled by a two-level Hamiltonian. We assume that a constant magnetic field ${\bf B}_0$ acts on the spin, that…

Mesoscale and Nanoscale Physics · Physics 2009-11-07 L. N. Bulaevskii , M. Hruška , G. Ortiz

We analyze spin-dependent transport through a spin-diode in the presence of spin-flip and under influence of temperature bias. The current polarization and the spin accumulation are investigated in detail by means of reduced density matrix.…

Mesoscale and Nanoscale Physics · Physics 2012-04-10 M. Bagheri Tagani , H. Rahimpour Soleimani

We study spin-polarized transient transport in a quantum dot coupled to two ferromagnetic leads subjected to a rectangular bias voltage pulse. Time-dependent spin-resolved currents, occupations, spin accumulation, and tunneling…

Mesoscale and Nanoscale Physics · Physics 2011-11-09 F. M. Souza , S. A. Leao , R. M. Gester , A. P. Jauho

We study transport through ballistic and diffuse ferromagnetic domain walls in a two-band Stoner model with a rotating magnetization direction. For a ballistic domain wall, the change in the conductance due to the domain wall scattering is…

Mesoscale and Nanoscale Physics · Physics 2009-10-31 Arne Brataas , Gen Tatara , Gerrit E. W. Bauer

Tunneling spectroscopy between parallel two-dimensional (2D) electronic systems provides a powerful method to probe the underlying electronic properties by measuring tunneling conductance. In this work, we present a theoretical framework…

Mesoscale and Nanoscale Physics · Physics 2025-09-29 Modi Ke , Mahmoud M. Asmar , Wang-Kong Tse

We investigate the linear and nonlinear transport through a single level quantum dot connected to two ferromagnetic leads in Kondo regime, using the slave-boson mean field approach for finite on-site Coulomb repulsion. We find that for…

Condensed Matter · Physics 2007-05-23 Jing Ma , Bing Dong , X. L. Lei

Long-range spin transport in magnetic systems can be achieved by means of exchange-mediated spin textures with robust topological winding -- a phenomenon referred to as spin superfluidity. Its experimental signatures have been discussed in…

We theoretically investigate laser-induced spin transport in metallic magnetic heterostructures using an effective spin transport description that treats itinerant electrons and thermal magnons on an equal footing. Electron-magnon…

Mesoscale and Nanoscale Physics · Physics 2022-04-27 Maarten Beens , Rembert A. Duine , Bert Koopmans

We introduce the concept of bond spin current, which describes the spin transport between two sites of the lattice model of a multiterminal spin-orbit (SO) coupled semiconductor nanostructure, and express it in terms of the spin-dependent…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Branislav K. Nikolic , Liviu P. Zarbo , Satofumi Souma

For a non-superconducting system, the electronic tunneling current through an insulating barrier is calculated, including interaction effects. The exact Hamiltonian of the full system is projected onto the subspaces of the "left" and…

Mesoscale and Nanoscale Physics · Physics 2010-07-09 Kelly R. Patton

We theoretically investigate transport in a spin incoherent one dimensional electron system, which may be realized in quantum wires at low electron density and finite temperature. Both the pure and disordered cases are considered, both in…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Gregory A. Fiete , Karyn Le Hur , Leon Balents
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