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Abstract:

The precessing magnetization of a magnetic islands coupled to a quantum spin Hall edge pumps charge along the edge. Conversely, a bias voltage applied to the edge makes the magnetization precess. We point out that this device realizes an adiabatic quantum motor and discuss the efficiency of its operation based on a scattering matrix approach akin to Landauer-Büttiker theory. Scattering theory provides a microscopic derivation of the Landau-Lifshitz-Gilbert equation for the magnetization dynamics of the device, including spin-transfer torque, Gilbert damping, and Langevin torque. We find that the device can be viewed as a Thouless motor, attaining unit efficiency when the chemical potential of the edge states falls into the magnetization-induced gap. For more general parameters, we characterize the device by means of a figure of merit analogous to the ZT value in thermoelectrics. © 2015 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor
Autor:Arrachea, L.; Von Oppen, F.
Filiación:Departamento de Física, FCEyN, Universidad de Buenos Aires and IFIBA, Pabellón i, Ciudad Universitaria, CABA, 1428, Argentina
International Center for Advanced Studies, UNSAM, Campus Miguelete, 25 de Mayo y Francia, Buenos Aires, 1650, Argentina
Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin, 14195, Germany
Palabras clave:Magnetization dynamics; Quantum spin Hall effect; Topological insulators; Magnetization; Scattering parameters; Spin dynamics; Spin Hall effect; Landau-Lifshitz-Gilbert equations; Magnetization dynamics; Quantum Spin hall effect; Quantum spin halls; Scattering matrix approach; Scattering theory; Spin transfer torque; Topological insulators; Quantum Hall effect
Año:2015
Volumen:74
Página de inicio:596
Página de fin:602
DOI: http://dx.doi.org/10.1016/j.physe.2015.08.031
Título revista:Physica E: Low-Dimensional Systems and Nanostructures
Título revista abreviado:Phys E
ISSN:13869477
CODEN:PELNF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13869477_v74_n_p596_Arrachea

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Citas:

---------- APA ----------
Arrachea, L. & Von Oppen, F. (2015) . Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor. Physica E: Low-Dimensional Systems and Nanostructures, 74, 596-602.
http://dx.doi.org/10.1016/j.physe.2015.08.031
---------- CHICAGO ----------
Arrachea, L., Von Oppen, F. "Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor" . Physica E: Low-Dimensional Systems and Nanostructures 74 (2015) : 596-602.
http://dx.doi.org/10.1016/j.physe.2015.08.031
---------- MLA ----------
Arrachea, L., Von Oppen, F. "Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor" . Physica E: Low-Dimensional Systems and Nanostructures, vol. 74, 2015, pp. 596-602.
http://dx.doi.org/10.1016/j.physe.2015.08.031
---------- VANCOUVER ----------
Arrachea, L., Von Oppen, F. Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor. Phys E. 2015;74:596-602.
http://dx.doi.org/10.1016/j.physe.2015.08.031