Year: 2007
Type: article
Abstract: We calculate the Fermi energy dependence of the (time-averaged) current and shot noise in an impurity-free carbon bilayer (length $L⪡\text{width}$ $W$), and compare with known results for a monolayer. At the Dirac point of charge neutrality, the bilayer transmits as two independent monolayers in parallel: Both current and noise are resonant at twice the monolayer value, so that their ratio (the Fano factor) has the same $1∕3$ value as in a monolayer---and the same value as in a diffusive metal. The range of Fermi energies around the Dirac point within which this pseudodiffusive result holds is smaller, however, in a bilayer than in a monolayer (by a factor ${l}_{\ensuremath{\perp}}∕L$, with ${l}_{\ensuremath{\perp}}$ the interlayer coupling length).
Source: Physical Review B
Authors: I. Snyman, C. W. J. Beenakker
Institution: Leiden University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2044346191