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Conductance anomaly near the Lifshitz transition in strained bilayer graphene | | Diana A. Gradinar
; Henning Schomerus
; Vladimir I. Fal'ko
; | | Date: |
27 Feb 2012 | | Abstract: | Strain qualitatively changes the low-energy band structure of bilayer
graphene, leading to the appearance of a pair of low-energy Dirac cones near
each corner of the Brillouin zone, and a Lifshitz transition (a saddle point in
the dispersion relation) at an energy proportional to the strain [M.
Mucha-Kruczynski, I.L. Aleiner, and V.I. Fal’ko, Phys. Rev. B 84, 041404
(2011)]. Here, we show that in the vicinity of the Lifshitz transition the
conductance of a ballistic n-p and n-p-n junction exhibits an anomaly: a
non-monotonic temperature and chemical potential dependence, with the size
depending on the crystallographic orientation of the principal axis of the
strain tensor. This effect is characteristic for junctions between regions of
different polarity (n-p and n-p-n junctions), while there is no anomaly in
junctions between regions of the same polarity (n-n’ and n-n’-n junctions). | | Source: | arXiv, 1202.5965 | | Services: | Forum | Review | PDF | Favorites | |
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