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Article: Theory of magnetoelectric photocurrent generated by direct interband transitions in a semiconductor quantum well
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TitleTheory of magnetoelectric photocurrent generated by direct interband transitions in a semiconductor quantum well
 
AuthorsLu, HZ1
Zhou, B2
Zhang, FC1
Shen, SQ1
 
Issue Date2011
 
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
 
CitationPhysical Review B - Condensed Matter And Materials Physics, 2011, v. 83 n. 12 [How to Cite?]
DOI: http://dx.doi.org/10.1103/PhysRevB.83.125320
 
AbstractA linearly polarized light normally incident on a semiconductor quantum well with spin-orbit coupling may generate pure spin current via direct interband optical transition. An electric photocurrent can be extracted from the pure spin current when an in-plane magnetic field is applied, which has been recently observed in the InGaAs/InAlAs quantum well. Here we present a theoretical study of this magnetoelectric photocurrent effect associated with the interband transition. By employing the density matrix formalism, we show that the photoexcited carrier density has an anisotropic distribution in k space, strongly dependent on the orientation of the electron wavevector and the polarization of the light. This anisotropy provides an intuitive picture of the observed dependence of the photocurrent on the magnetic field and the polarization of the light. We also show that the ratio of the pure spin photocurrent to the magnetoelectric photocurrent is approximately equal to the ratio of the kinetic energy to the Zeeman energy, which enables us to estimate the magnitude of the pure spin photocurrent. The photocurrent density calculated with the help of an anisotropic Rashba model and the Kohn-Luttinger model can produce all three terms in the fitting formula for measured current, with comparable order of magnitude, but discrepancies are still present and further investigation is needed. © 2011 American Physical Society.
 
ISSN1098-0121
2012 Impact Factor: 3.767
2012 SCImago Journal Rankings: 2.393
 
DOIhttp://dx.doi.org/10.1103/PhysRevB.83.125320
 
ISI Accession Number IDWOS:000288945900002
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU7041/07P
HKU 10/CRF/08
National Natural Science Foundation of China10974046
Hubei Provincial Natural Science Foundation of China2009CDB360
Funding Information:

We thank Xiaodong Cui, Junfeng Dai, Chun-LeiYang, Wei-Qiang Chen, Jing Wang, Ren-Bao Liu, and Bang-fen Zhu for helpful discussions. This work was supported by the Research Grant Council of Hong Kong under Grant Nos. HKU7041/07P, and HKU 10/CRF/08. ZB was supported by National Natural Science Foundation of China (Grant No. 10974046) and Hubei Provincial Natural Science Foundation of China (Grant No. 2009CDB360).

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorLu, HZ
 
dc.contributor.authorZhou, B
 
dc.contributor.authorZhang, FC
 
dc.contributor.authorShen, SQ
 
dc.date.accessioned2011-06-17T09:20:58Z
 
dc.date.available2011-06-17T09:20:58Z
 
dc.date.issued2011
 
dc.description.abstractA linearly polarized light normally incident on a semiconductor quantum well with spin-orbit coupling may generate pure spin current via direct interband optical transition. An electric photocurrent can be extracted from the pure spin current when an in-plane magnetic field is applied, which has been recently observed in the InGaAs/InAlAs quantum well. Here we present a theoretical study of this magnetoelectric photocurrent effect associated with the interband transition. By employing the density matrix formalism, we show that the photoexcited carrier density has an anisotropic distribution in k space, strongly dependent on the orientation of the electron wavevector and the polarization of the light. This anisotropy provides an intuitive picture of the observed dependence of the photocurrent on the magnetic field and the polarization of the light. We also show that the ratio of the pure spin photocurrent to the magnetoelectric photocurrent is approximately equal to the ratio of the kinetic energy to the Zeeman energy, which enables us to estimate the magnitude of the pure spin photocurrent. The photocurrent density calculated with the help of an anisotropic Rashba model and the Kohn-Luttinger model can produce all three terms in the fitting formula for measured current, with comparable order of magnitude, but discrepancies are still present and further investigation is needed. © 2011 American Physical Society.
 
dc.description.naturepublished_or_final_version
 
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2011, v. 83 n. 12 [How to Cite?]
DOI: http://dx.doi.org/10.1103/PhysRevB.83.125320
 
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.83.125320
 
dc.identifier.epage125320-14
 
dc.identifier.hkuros185915
 
dc.identifier.isiWOS:000288945900002
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU7041/07P
HKU 10/CRF/08
National Natural Science Foundation of China10974046
Hubei Provincial Natural Science Foundation of China2009CDB360
Funding Information:

We thank Xiaodong Cui, Junfeng Dai, Chun-LeiYang, Wei-Qiang Chen, Jing Wang, Ren-Bao Liu, and Bang-fen Zhu for helpful discussions. This work was supported by the Research Grant Council of Hong Kong under Grant Nos. HKU7041/07P, and HKU 10/CRF/08. ZB was supported by National Natural Science Foundation of China (Grant No. 10974046) and Hubei Provincial Natural Science Foundation of China (Grant No. 2009CDB360).

 
dc.identifier.issn1098-0121
2012 Impact Factor: 3.767
2012 SCImago Journal Rankings: 2.393
 
dc.identifier.issue12
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-79961068870
 
dc.identifier.spage125320-1
 
dc.identifier.urihttp://hdl.handle.net/10722/134445
 
dc.identifier.volume83
 
dc.languageeng
 
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
 
dc.publisher.placeUnited States
 
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physics
 
dc.relation.referencesReferences in Scopus
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.
 
dc.titleTheory of magnetoelectric photocurrent generated by direct interband transitions in a semiconductor quantum well
 
dc.typeArticle
 
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<contributor.author>Shen, SQ</contributor.author>
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<description.abstract>A linearly polarized light normally incident on a semiconductor quantum well with spin-orbit coupling may generate pure spin current via direct interband optical transition. An electric photocurrent can be extracted from the pure spin current when an in-plane magnetic field is applied, which has been recently observed in the InGaAs/InAlAs quantum well. Here we present a theoretical study of this magnetoelectric photocurrent effect associated with the interband transition. By employing the density matrix formalism, we show that the photoexcited carrier density has an anisotropic distribution in k space, strongly dependent on the orientation of the electron wavevector and the polarization of the light. This anisotropy provides an intuitive picture of the observed dependence of the photocurrent on the magnetic field and the polarization of the light. We also show that the ratio of the pure spin photocurrent to the magnetoelectric photocurrent is approximately equal to the ratio of the kinetic energy to the Zeeman energy, which enables us to estimate the magnitude of the pure spin photocurrent. The photocurrent density calculated with the help of an anisotropic Rashba model and the Kohn-Luttinger model can produce all three terms in the fitting formula for measured current, with comparable order of magnitude, but discrepancies are still present and further investigation is needed. &#169; 2011 American Physical Society.</description.abstract>
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Author Affiliations
  1. The University of Hong Kong
  2. Hubei University