Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-04-17
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 revtex pages, no figures
Scientific paper
10.1209/epl/i2002-00327-4
We analyze an interplay between Coulomb blockade and quantum fluctuations in a coherent conductor (with dimensionless conductance $g \gtrsim 1$) 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 $h/e^2\approx 25.8$ k$\Omega$. 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.
Golubev Dmitri S.
Zaikin Andrei D.
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