Graphene quantum dots: Beyond a Dirac billiard

被引：117

作者：

Libisch, Florian ^{[1
]}

Stampfer, Christoph ^{[2
]}

Burgdorfer, Joachim ^{[1
]}

机构：

[1] Vienna Univ Technol, Inst Theoret Phys, A-1040 Vienna, Austria

[2] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 11期

关键词：

Coulomb blockade; fermion systems; graphene; nanostructured materials; quantum dots; KLEIN PARADOX; FLUCTUATIONS; STATISTICS; TRANSPORT; REPULSION; PHASE;

D O I：

10.1103/PhysRevB.79.115423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present realistic simulations of quantum confinement effects in phase-coherent graphene quantum dots with linear dimensions of 10-40 nm. We determine wave functions and energy-level statistics in the presence of disorder resulting from edge roughness, charge impurities, or short-ranged scatterers. Marked deviations from a simple Dirac billiard for massless fermions are found. We find a remarkably stable dependence of the nearest-neighbor level spacing on edge roughness suggesting that the roughness of fabricated devices can be possibly characterized by the distribution of measured Coulomb blockade peaks.

引用

页数：6

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