Volume 60, Number 1, October 2002
|Page(s)||113 - 119|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Coulomb blockade and insulator-to-metal quantum phase transition
Institut für Theoretische Festkörperphysik,
76128 Karlsruhe, Germany
2 I. E. Tamm Department of Theoretical Physics, P. N. Lebedev Physics Institute Leninskii pr. 53, 117924 Moscow, Russia
3 Forschungszentrum Karlsruhe, Institut für Nanotechnologie 76021 Karlsruhe, Germany
Accepted: 15 July 2002
We analyze an interplay between Coulomb blockade and quantum fluctuations in a coherent conductor (with dimensionless conductance g larger than unity) attached to an Ohmic shunt. We demonstrate that at T=0 the system can be either an insulator or a metal depending on whether its total resistance is larger or smaller than kΩ. In a metallic phase the Coulomb gap is fully suppressed by quantum fluctuations. We briefly discuss possible relation of this effect to recent experiments indicating the presence of a metal-insulator phase transition in 2d disordered systems.
PACS: 72.10.-d – Theory of electronic transport; scattering mechanisms / 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.10.-w – Theories and models of many-electron systems
© EDP Sciences, 2002
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