Spin-orbit effects on two-electron states in nanowhisker double quantum dots

We investigate theoretically the combined effects of the electron-electron and the Rashba spin-orbit interactions on two electrons confined in quasi-one-dimensional semiconductor double quantum dots. We study both InSb-based structures, which are of interest due to their strong spin-orbit coupling,...

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Autores principales:	Romano, C.L., Tamborenea, P.I., Ulloa, S.E.
Formato:	JOUR
Materias:	Electron interactions Nanowhisker Quantum dots Rashba effect Spin-orbit coupling Anticrossings Applied magnetic fields Barrier widths Combined effect Double quantum dots Effective mass approximation Electron state Electron wave functions Energy level Energy spectra Exchange integrals InAs Quasi-one-dimensional Rashba spin orbit interaction Singlet state Spin-orbit couplings Spin-orbit effects Crystal whiskers Current voltage characteristics Electron energy levels Electrons Indium arsenide Lithium compounds Magnetic fields Nanowhiskers Orbits Spin dynamics Semiconductor quantum dots
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_13869477_v41_n8_p1577_Romano
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_13869477_v41_n8_p1577_Romano
record_format	dspace
spelling	todo:paper_13869477_v41_n8_p1577_Romano2023-10-03T16:12:24Z Spin-orbit effects on two-electron states in nanowhisker double quantum dots Romano, C.L. Tamborenea, P.I. Ulloa, S.E. Electron interactions Nanowhisker Quantum dots Rashba effect Spin-orbit coupling Anticrossings Applied magnetic fields Barrier widths Combined effect Double quantum dots Effective mass approximation Electron interactions Electron state Electron wave functions Energy level Energy spectra Exchange integrals InAs Quantum dots Quasi-one-dimensional Rashba effect Rashba spin orbit interaction Singlet state Spin-orbit coupling Spin-orbit couplings Spin-orbit effects Crystal whiskers Current voltage characteristics Electron energy levels Electrons Indium arsenide Lithium compounds Magnetic fields Nanowhiskers Orbits Spin dynamics Semiconductor quantum dots We investigate theoretically the combined effects of the electron-electron and the Rashba spin-orbit interactions on two electrons confined in quasi-one-dimensional semiconductor double quantum dots. We study both InSb-based structures, which are of interest due to their strong spin-orbit coupling, and also InAs-based systems, which have been recently studied experimentally. We calculate the two-electron wave functions in the effective-mass approximation and explore the interplay between the two interactions on the energy levels and the spin of the states. The energy spectrum as a function of an applied magnetic field shows crossings and anticrossings between triplet and singlet states, associated with level mixing induced by the spin-orbit coupling. We find that the fields at which these crossings occur can be naturally controlled by the interdot barrier width, which controls the exchange integral in the structure. © 2009 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_13869477_v41_n8_p1577_Romano
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Electron interactions Nanowhisker Quantum dots Rashba effect Spin-orbit coupling Anticrossings Applied magnetic fields Barrier widths Combined effect Double quantum dots Effective mass approximation Electron interactions Electron state Electron wave functions Energy level Energy spectra Exchange integrals InAs Quantum dots Quasi-one-dimensional Rashba effect Rashba spin orbit interaction Singlet state Spin-orbit coupling Spin-orbit couplings Spin-orbit effects Crystal whiskers Current voltage characteristics Electron energy levels Electrons Indium arsenide Lithium compounds Magnetic fields Nanowhiskers Orbits Spin dynamics Semiconductor quantum dots
spellingShingle	Electron interactions Nanowhisker Quantum dots Rashba effect Spin-orbit coupling Anticrossings Applied magnetic fields Barrier widths Combined effect Double quantum dots Effective mass approximation Electron interactions Electron state Electron wave functions Energy level Energy spectra Exchange integrals InAs Quantum dots Quasi-one-dimensional Rashba effect Rashba spin orbit interaction Singlet state Spin-orbit coupling Spin-orbit couplings Spin-orbit effects Crystal whiskers Current voltage characteristics Electron energy levels Electrons Indium arsenide Lithium compounds Magnetic fields Nanowhiskers Orbits Spin dynamics Semiconductor quantum dots Romano, C.L. Tamborenea, P.I. Ulloa, S.E. Spin-orbit effects on two-electron states in nanowhisker double quantum dots
topic_facet	Electron interactions Nanowhisker Quantum dots Rashba effect Spin-orbit coupling Anticrossings Applied magnetic fields Barrier widths Combined effect Double quantum dots Effective mass approximation Electron interactions Electron state Electron wave functions Energy level Energy spectra Exchange integrals InAs Quantum dots Quasi-one-dimensional Rashba effect Rashba spin orbit interaction Singlet state Spin-orbit coupling Spin-orbit couplings Spin-orbit effects Crystal whiskers Current voltage characteristics Electron energy levels Electrons Indium arsenide Lithium compounds Magnetic fields Nanowhiskers Orbits Spin dynamics Semiconductor quantum dots
description	We investigate theoretically the combined effects of the electron-electron and the Rashba spin-orbit interactions on two electrons confined in quasi-one-dimensional semiconductor double quantum dots. We study both InSb-based structures, which are of interest due to their strong spin-orbit coupling, and also InAs-based systems, which have been recently studied experimentally. We calculate the two-electron wave functions in the effective-mass approximation and explore the interplay between the two interactions on the energy levels and the spin of the states. The energy spectrum as a function of an applied magnetic field shows crossings and anticrossings between triplet and singlet states, associated with level mixing induced by the spin-orbit coupling. We find that the fields at which these crossings occur can be naturally controlled by the interdot barrier width, which controls the exchange integral in the structure. © 2009 Elsevier B.V. All rights reserved.
format	JOUR
author	Romano, C.L. Tamborenea, P.I. Ulloa, S.E.
author_facet	Romano, C.L. Tamborenea, P.I. Ulloa, S.E.
author_sort	Romano, C.L.
title	Spin-orbit effects on two-electron states in nanowhisker double quantum dots
title_short	Spin-orbit effects on two-electron states in nanowhisker double quantum dots
title_full	Spin-orbit effects on two-electron states in nanowhisker double quantum dots
title_fullStr	Spin-orbit effects on two-electron states in nanowhisker double quantum dots
title_full_unstemmed	Spin-orbit effects on two-electron states in nanowhisker double quantum dots
title_sort	spin-orbit effects on two-electron states in nanowhisker double quantum dots
url	http://hdl.handle.net/20.500.12110/paper_13869477_v41_n8_p1577_Romano
work_keys_str_mv	AT romanocl spinorbiteffectsontwoelectronstatesinnanowhiskerdoublequantumdots AT tamboreneapi spinorbiteffectsontwoelectronstatesinnanowhiskerdoublequantumdots AT ulloase spinorbiteffectsontwoelectronstatesinnanowhiskerdoublequantumdots
_version_	1782026949687771136

Spin-orbit effects on two-electron states in nanowhisker double quantum dots

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