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Quantum beats in conductance oscillations in graphene-based asymmetric double velocity wells and electrostatic wells.

Authors :
Lei Liu
Yu-Xian Li
Ying-Tao Zhang
Jian-Jun Liu
Source :
Journal of Applied Physics; 2014, Vol. 115 Issue 2, p1-7, 7p, 1 Color Photograph, 1 Black and White Photograph, 1 Chart, 4 Graphs
Publication Year :
2014

Abstract

The transport properties in graphene-based asymmetric double velocity well (Fermi velocity inside the well less than that outside the well) and electrostatic well structures are investigated using the transfer matrix method. The results show that quantum beats occur in the oscillations of the conductance for asymmetric double velocity wells. The beating effect can also be found in asymmetric double electrostatic wells, but only if the widths of the two wells are different. The beat frequency for the asymmetric double well is exactly equal to the frequency difference between the oscillation rates in two isolated single wells with the same structures as the individual wells in the double well structure. A qualitative interpretation is proposed based on the fact that the resonant levels depend upon the sizes of the quantum wells. The beating behavior can provide a new way to identify the symmetry of double well structures. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00218979
Volume :
115
Issue :
2
Database :
Complementary Index
Journal :
Journal of Applied Physics
Publication Type :
Academic Journal
Accession number :
93685723
Full Text :
https://doi.org/10.1063/1.4861381