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Conductance of a disordered double quantum wire in a magnetic field: Boundary roughness scattering
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics IV.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics IV.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics IV.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics IV.
2003 (English)In: PHYSICAL REVIEW B, Vol. 67, 115328- p.Article in journal (Refereed) Published
Abstract [en]

Boundary roughness scattering in disordered tunnel-coupled quantum wires in the presence of a magnetic

field is considered. The low-temperature conductance as a function of applied magnetic field is calculated for

different structure and disorder parameters using the method of the generalized S-matrix composition.We show

that despite the fact that lateral wire width fluctuations of the size of few atomic layers may significantly shift

the partial energy gap, the effect of the conductance enhancement at energies in the partial energy gap does

take place in sufficiently strong magnetic fields and small correlation length of the disorder defined as the

average distance between the neighboring discontinuities of the boundary profile. The last parameter is shown

to be particularly important for the determination of the transport properties of the system. Remarkably, we find

that in a wide range of system parameters the conductance decreases with the correlation length despite the

decreasing number of boundary discontinuities.

Place, publisher, year, edition, pages
2003. Vol. 67, 115328- p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-77301DOI: doi:10.1103/PhysRevB.67.115328OAI: oai:DiVA.org:uu-77301DiVA: diva2:105213
Available from: 2008-07-30 Created: 2008-07-30 Last updated: 2011-01-13

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Arapan, SergiuLiberman, MichaelJohansson, Börje

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