Energy levels of a parabolically confined quantum dot in the presence of spin-orbit interaction
Identifieur interne : 00A429 ( Main/Repository ); précédent : 00A428; suivant : 00A430Energy levels of a parabolically confined quantum dot in the presence of spin-orbit interaction
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Abstract
We present a theoretical study of the energy levels in a parabolically confined quantum dot in the presence of the Rashba spin-orbit interaction (SOI). The features of some low-lying states in various strengths of the SOI are examined at zero and nonzero magnetic fields. It is shown that the spin-polarized electronic states can be more easily achieved in a weakly confined dot when SOI is greater than a critical value of the confinement strength. The presence of a magnetic field enhances the possibility of the spin polarization and the SOI leads to different energy dependence on magnetic fields applied. Furthermore, in high magnetic fields, the spectra of low-lying states show basic features of Fock-Darwin levels as well as Landau levels. © 2004 American Institute of Physics.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Energy levels of a parabolically confined quantum dot in the presence of spin-orbit interaction</title><author><name sortKey="Kuan, W H" uniqKey="Kuan W">W. H. Kuan</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">République de Chine (Taïwan)</country><wicri:regionArea>Department of Electrophysics, National Chiao Tung University, Hsinchu 30010</wicri:regionArea><wicri:noRegion>Hsinchu 30010</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Physics Division, National Center for Theoretical Sciences, P.O. Box 2-131, Hsinchu 30013, Taiwan</s1></inist:fA14><country xml:lang="fr">République de Chine (Taïwan)</country><wicri:regionArea>Physics Division, National Center for Theoretical Sciences, P.O. Box 2-131, Hsinchu 30013</wicri:regionArea><wicri:noRegion>Hsinchu 30013</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Theoretical Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia</s1></inist:fA14><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Theoretical Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200</wicri:regionArea><wicri:noRegion>ACT 0200</wicri:noRegion></affiliation></author><author><name sortKey="Tang, C S" uniqKey="Tang C">C. S. Tang</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">République de Chine (Taïwan)</country><wicri:regionArea>Department of Electrophysics, National Chiao Tung University, Hsinchu 30010</wicri:regionArea><wicri:noRegion>Hsinchu 30010</wicri:noRegion></affiliation></author><author><name sortKey="Xu, W" uniqKey="Xu W">W. Xu</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">République de Chine (Taïwan)</country><wicri:regionArea>Department of Electrophysics, National Chiao Tung University, Hsinchu 30010</wicri:regionArea><wicri:noRegion>Hsinchu 30010</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="inist">04-0242536</idno><date when="2004-06-01">2004-06-01</date><idno type="stanalyst">PASCAL 04-0242536 AIP</idno><idno type="RBID">Pascal:04-0242536</idno><idno type="wicri:Area/Main/Corpus">00B709</idno><idno type="wicri:Area/Main/Repository">00A429</idno></publicationStmt><seriesStmt><idno type="ISSN">0021-8979</idno><title level="j" type="abbreviated">J. appl. phys.</title><title level="j" type="main">Journal of applied physics</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aluminium compounds</term><term>Electronic structure</term><term>Gallium arsenides</term><term>III-V semiconductors</term><term>Indium compounds</term><term>Interface states</term><term>Landau levels</term><term>Numerical analysis</term><term>Semiconductor quantum dots</term><term>Spin-orbit interactions</term><term>Theoretical study</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>7170E</term><term>7170D</term><term>7321L</term><term>7120N</term><term>Etude théorique</term><term>Indium composé</term><term>Aluminium composé</term><term>Gallium arséniure</term><term>Semiconducteur III-V</term><term>Point quantique semiconducteur</term><term>Structure électronique</term><term>Interaction spin orbite</term><term>Niveau Landau</term><term>Analyse numérique</term><term>Etat interface</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present a theoretical study of the energy levels in a parabolically confined quantum dot in the presence of the Rashba spin-orbit interaction (SOI). The features of some low-lying states in various strengths of the SOI are examined at zero and nonzero magnetic fields. It is shown that the spin-polarized electronic states can be more easily achieved in a weakly confined dot when SOI is greater than a critical value of the confinement strength. The presence of a magnetic field enhances the possibility of the spin polarization and the SOI leads to different energy dependence on magnetic fields applied. Furthermore, in high magnetic fields, the spectra of low-lying states show basic features of Fock-Darwin levels as well as Landau levels. © 2004 American Institute of Physics.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0021-8979</s0></fA01><fA02 i1="01"><s0>JAPIAU</s0></fA02><fA03 i2="1"><s0>J. appl. phys.</s0></fA03><fA05><s2>95</s2></fA05><fA06><s2>11</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Energy levels of a parabolically confined quantum dot in the presence of spin-orbit interaction</s1></fA08><fA11 i1="01" i2="1"><s1>KUAN (W. H.)</s1></fA11><fA11 i1="02" i2="1"><s1>TANG (C. S.)</s1></fA11><fA11 i1="03" i2="1"><s1>XU (W.)</s1></fA11><fA14 i1="01"><s1>Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></fA14><fA14 i1="02"><s1>Physics Division, National Center for Theoretical Sciences, P.O. Box 2-131, Hsinchu 30013, Taiwan</s1></fA14><fA14 i1="03"><s1>Department of Theoretical Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia</s1></fA14><fA20><s1>6368-6373</s1></fA20><fA21><s1>2004-06-01</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>126</s2></fA43><fA44><s0>8100</s0><s1>© 2004 American Institute of Physics. All rights reserved.</s1></fA44><fA47 i1="01" i2="1"><s0>04-0242536</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Journal of applied physics</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>We present a theoretical study of the energy levels in a parabolically confined quantum dot in the presence of the Rashba spin-orbit interaction (SOI). The features of some low-lying states in various strengths of the SOI are examined at zero and nonzero magnetic fields. It is shown that the spin-polarized electronic states can be more easily achieved in a weakly confined dot when SOI is greater than a critical value of the confinement strength. The presence of a magnetic field enhances the possibility of the spin polarization and the SOI leads to different energy dependence on magnetic fields applied. 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