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Article: Theory of magnetoelectric photocurrent generated by direct interband transitions in a semiconductor quantum well

TitleTheory of magnetoelectric photocurrent generated by direct interband transitions in a semiconductor quantum well
Authors
Issue Date2011
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2011, v. 83 n. 12 How to Cite?
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. © 2011 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/134445
ISSN
2013 Impact Factor: 3.664
2013 SCImago Journal Rankings: 2.143
ISI Accession Number ID
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).

References

 

Author Affiliations
  1. The University of Hong Kong
  2. Hubei University
DC FieldValueLanguage
dc.contributor.authorLu, HZen_HK
dc.contributor.authorZhou, Ben_HK
dc.contributor.authorZhang, FCen_HK
dc.contributor.authorShen, SQen_HK
dc.date.accessioned2011-06-17T09:20:58Z-
dc.date.available2011-06-17T09:20:58Z-
dc.date.issued2011en_HK
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2011, v. 83 n. 12en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/134445-
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.en_HK
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_HK
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 wellen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=83&issue=12, article no. 125320&spage=125320&epage=1&date=2011&atitle=Theory+of+magnetoelectric+photocurrent+generated+by+direct+interband+transitions+in+a+semiconductor+quantum+well-
dc.identifier.emailLu, HZ: luhz@hku.hken_HK
dc.identifier.emailZhang, FC: fuchun@hkucc.hku.hken_HK
dc.identifier.emailShen, SQ: sshen@hkucc.hku.hken_HK
dc.identifier.authorityLu, HZ=rp01599en_HK
dc.identifier.authorityZhang, FC=rp00840en_HK
dc.identifier.authorityShen, SQ=rp00775en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.83.125320en_HK
dc.identifier.scopuseid_2-s2.0-79961068870en_HK
dc.identifier.hkuros185915en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79961068870&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume83en_HK
dc.identifier.issue12en_HK
dc.identifier.spage125320-1en_US
dc.identifier.epage125320-14en_US
dc.identifier.isiWOS:000288945900002-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLu, HZ=24376662200en_HK
dc.identifier.scopusauthoridZhou, B=7401906664en_HK
dc.identifier.scopusauthoridZhang, FC=14012468800en_HK
dc.identifier.scopusauthoridShen, SQ=7403431266en_HK

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