
Tunneling through an impurity in a Luttinger liquid with an interaction potential of finite range
M. Sassetti , B. Kramer, and G. Cuniberti.
Deutsche Physikalische Gesellschaft, AKF Frühjahrstagung 1997 German Physical Society, Spring Meeting 1997
1997.03; Münster, Germany
 The nonlinear transport through a tunnel barrier
in a Luttinger system is investigated for repulsive
electronelectron interaction of finite range
[1]. Depending on whether the electrons are located on
different or on the same sides of the barrier, the
interaction strengths are assumed to be given by
V_{12} and V_{11}, respectively. The
features of the Coulomb blockade are found in the
currentvoltage characteristics when the range of the
interaction potential is nonzero, and if
V_{12} = 0. In this limit, the parameters of
the semiclassical theory of the Coulomb blockade,
namely the tunneling resistance, the capacitance, and
the impedance of the circuit are identified in terms of
the microscopic parameters of the quantum mechanical
model of the interacting electrons. If V_{12} =
V_{11} the current is still suppressed at small
bias voltage but the charging energy vanishes. We
demonstrate that the latter is a consequence of an
exact sum rule. The results are discussed in the light
of experimental findings. [1] M. Sassetti,
G. Cuniberti, B. Kramer, in press



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Prof. Dr. Gianaurelio Cuniberti
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