Research Article


2011, 4(4): 385–392


Massless and Massive Particle-in-a-Box States in Single- and Bi-Layer Graphene

Sungjae Cho and Michael Fuhrer ()

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Department of Physics and Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA

Keywords: KEYWORDS Fabry–Perot, interference, ballistic, density of states, phase-coherent
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ABSTRACT Electron transport through short, phase-coherent metal–graphene–metal devices occurs via resonant transmission through particle-in-a-box-like states defined by the atomically-sharp metal leads. We study the spectrum of particle-in-a-box states for single- and bi-layer graphene, corresponding to massless and massive two-dimensional (2-D) fermions. The density of states D as a function of particle number n shows the expected relationships D(n) ~ n1/2 for massless 2-D fermions (electrons in single-layer graphene) and D(n) ~ constant for massive 2-D fermions (electrons in bi-layer graphene). The single parameters of the massless and massive dispersion relations are found, namely Fermi velocity vF = 1.1 × 106 m/s and effective mass m* = 0.032 me, where me is the electron mass, in excellent agreement with theoretical expectations.
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Massless and Massive Particle-in-a-Box States in Single- and Bi-Layer Graphene. Nano Res. 2011, 4(4): 385–392

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