Journal
PHYSICAL REVIEW B
Volume 87, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.035409
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Funding
- National Science Foundation through the University of Minnesota MRSEC [DMR-0819885]
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If a clean two-dimensional electron gas (2DEG) with a low concentration n comprises one electrode of a plane capacitor, the resulting capacitance C can be higher than the geometric capacitance C-g determined by the physical separation d between electrodes. A recent paper [B. Skinner and B. I. Shklovskii, Phys. Rev. B 82, 155111 (2010)] argued that when the effective Bohr radius a(B) of the 2DEG satisfies a(B) << d, one can achieve C >> C-g at a low concentration nd(2) << 1. Here we show that even for devices with a(B) > d, including graphene, for which a(B) is effectively infinite, one also arrives at C >> C-g at low electron concentrations if there is a strong perpendicular magnetic field. DOI: 10.1103/PhysRevB.87.035409
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