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Article: Tunneling transmission in two quantum wires coupled by a magnetically defined barrier

TitleTunneling transmission in two quantum wires coupled by a magnetically defined barrier
Authors
KeywordsPhysics engineering
Issue Date1997
PublisherAmerican Institute of Physics. The Journal's web site is located at http://jap.aip.org/jap/staff.jsp
Citation
Journal of Applied Physics, 1997, v. 82 n. 12, p. 6083-6088 How to Cite?
AbstractA numerical analysis of an electron waveguide coupler based on two quantum wires coupled by a magnetically defined barrier is presented with the use of the scattering-matrix method. For different geometry parameters and magnetic fields, tunneling transmission spectrum is obtained as a function of the electron energy. Different from that of conventional electron waveguide couplers, the transmission spectrum of the magnetically coupled quantum wires does not have the symmetry with regard to those geometrically symmetrical ports. It was found that the magnetic field in the coupling region drastically enhances the coupling between the two quantum wires for one specific input port while it weakens the coupling for the other input port. The results can be well understood by the formation of the edge states in the magnetically defined barrier region. Thus, whether these edge states couple or decouple to the electronic propagation modes in the two quantum wires, strongly depend on the relative moving directions of electrons in the propagating mode in the input port and the edge states in the magnetic region. This leads to a big difference in transmission coefficients between two quantum wires when injecting electrons via different input ports. Two important coupler specifications, the directivity and uniformity, are calculated which show that the system we considered behaves as a good quantum directional coupler. ©1997 American Institute of Physics.
Persistent Identifierhttp://hdl.handle.net/10722/42444
ISSN
2015 Impact Factor: 2.101
2015 SCImago Journal Rankings: 0.603
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSheng, WDen_HK
dc.contributor.authorGu, BYen_HK
dc.contributor.authorWang, Jen_HK
dc.contributor.authorXia, JBen_HK
dc.date.accessioned2007-01-29T08:50:11Z-
dc.date.available2007-01-29T08:50:11Z-
dc.date.issued1997en_HK
dc.identifier.citationJournal of Applied Physics, 1997, v. 82 n. 12, p. 6083-6088en_HK
dc.identifier.issn0021-8979en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42444-
dc.description.abstractA numerical analysis of an electron waveguide coupler based on two quantum wires coupled by a magnetically defined barrier is presented with the use of the scattering-matrix method. For different geometry parameters and magnetic fields, tunneling transmission spectrum is obtained as a function of the electron energy. Different from that of conventional electron waveguide couplers, the transmission spectrum of the magnetically coupled quantum wires does not have the symmetry with regard to those geometrically symmetrical ports. It was found that the magnetic field in the coupling region drastically enhances the coupling between the two quantum wires for one specific input port while it weakens the coupling for the other input port. The results can be well understood by the formation of the edge states in the magnetically defined barrier region. Thus, whether these edge states couple or decouple to the electronic propagation modes in the two quantum wires, strongly depend on the relative moving directions of electrons in the propagating mode in the input port and the edge states in the magnetic region. This leads to a big difference in transmission coefficients between two quantum wires when injecting electrons via different input ports. Two important coupler specifications, the directivity and uniformity, are calculated which show that the system we considered behaves as a good quantum directional coupler. ©1997 American Institute of Physics.en_HK
dc.format.extent141820 bytes-
dc.format.extent27648 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Institute of Physics. The Journal's web site is located at http://jap.aip.org/jap/staff.jspen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysics engineeringen_HK
dc.titleTunneling transmission in two quantum wires coupled by a magnetically defined barrieren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0021-8979&volume=82&issue=12&spage=6083&epage=6088&date=1997&atitle=Tunneling+transmission+in+two+quantum+wires+coupled+by+a+magnetically+defined+barrieren_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1063/1.366478en_HK
dc.identifier.scopuseid_2-s2.0-0031361899-
dc.identifier.hkuros38941-
dc.identifier.isiWOS:000071043400029-

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