Phys. Rev. Lett. 67, 3168–3171 (1991)Coulomb blockade and nonperturbative ground-state properties of ultrasmall tunnel junctionsReceived 12 March 1991; published in the issue dated 25 November 1991 We present a nonperturbative calculation of the ground-state energy of a normal tunnel junction. The junction with a large conductance shows Coulomb blockade of tunneling provided the external charge Qx is less than e/4. For Qx>e/4, the band is flat and the junction behaves like an Ohmic resistor. We predict a phase transition between insulating and conducting behavior of the junction controlled by an external Ohmic resistance. We plot the corresponding zero-temperature phase diagram and calculate the junction effective resistance. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.67.3168
DOI:
10.1103/PhysRevLett.67.3168
PACS:
74.50.+r, 73.40.Gk
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