| Issue |
Europhys. Lett.
Volume 60, Number 1, October 2002
|
|
|---|---|---|
| Page(s) | 113 - 119 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00327-4 | |
| Published online | 01 September 2002 | |
Coulomb blockade and insulator-to-metal quantum phase transition
1
Institut für Theoretische Festkörperphysik,
Universität Karlsruhe,
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
Received:
23
October
2001
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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