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Negative differential conductance and effective electron mass in highly asymmetric ballistic bilayer graphene nanoribbon

Bhattacharya, Sitangshu and Mahapatra, Santanu (2010) Negative differential conductance and effective electron mass in highly asymmetric ballistic bilayer graphene nanoribbon. In: Physics Letters A, 374 (28). pp. 2850-2855.

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Official URL: http://dx.doi.org/10.1016/j.physleta.2010.04.078

Abstract

We present a simplified theory of the effective momentum mass (EMM) and ballistic current–voltage relationship in a degenerate two-folded highly asymmetric bilayer graphene nanoribbon. With an increase in the gap, the density-of-states in the lower set of subbands increases more than that of the upper set. This results in a phenomenological population inversion of carriers, which is reflected through a net negative differential conductance (NDC). It is found that with the increase of the ribbon width, the NDC also increases. The population inversion also signatures negative values of EMM above a certain ribbon-width for the lower set of subbands, which increases in a step-like manner with the applied longitudinal static bias. The well-known result for symmetric conditions has been obtained as a special case.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Graphene nanoribbon; Negative differential conductance; Effective mass
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly, (CEDT) Centre for Electronic Design & Technology)
Date Deposited: 13 Jul 2010 07:28
Last Modified: 19 Sep 2010 06:10
URI: http://eprints.iisc.ernet.in/id/eprint/28965

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