Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor

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 oper...

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Detalles Bibliográficos
Publicado:	2015
Materias:	Magnetization dynamics Quantum spin Hall effect Topological insulators Efficiency Magnetization Spin dynamics Spin Hall effect Landau-Lifshitz-Gilbert equations Quantum Spin hall effect Quantum spin halls Scattering matrix approach Scattering theory Spin transfer torque Quantum Hall effect
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13869477_v82_n_p_Arrachea http://hdl.handle.net/20.500.12110/paper_13869477_v82_n_p_Arrachea
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_13869477_v82_n_p_Arrachea
record_format	dspace
spelling	paper:paper_13869477_v82_n_p_Arrachea2025-07-30T18:48:40Z Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor Magnetization dynamics Quantum spin Hall effect Topological insulators Efficiency Magnetization 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 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. © 2016. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13869477_v82_n_p_Arrachea http://hdl.handle.net/20.500.12110/paper_13869477_v82_n_p_Arrachea
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Magnetization dynamics Quantum spin Hall effect Topological insulators Efficiency Magnetization 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
spellingShingle	Magnetization dynamics Quantum spin Hall effect Topological insulators Efficiency Magnetization 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 Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor
topic_facet	Magnetization dynamics Quantum spin Hall effect Topological insulators Efficiency Magnetization 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
description	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. © 2016.
title	Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor
title_short	Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor
title_full	Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor
title_fullStr	Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor
title_full_unstemmed	Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor
title_sort	reprint of: nanomagnet coupled to quantum spin hall edge: an adiabatic quantum motor
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13869477_v82_n_p_Arrachea http://hdl.handle.net/20.500.12110/paper_13869477_v82_n_p_Arrachea
_version_	1840324959274008576

Reprint of: Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor

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