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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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|
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