Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-09-13
Phys. Rev. B 71, 165309 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
28 pages, 19 figures, published version with minor changes
Scientific paper
10.1103/PhysRevB.71.165309
The inhomogeneous Tomonaga Luttinger liquid model describing an interacting quantum wire adiabatically coupled to non-interacting leads is analyzed in the presence of a weak impurity within the wire. Due to strong electronic correlations in the wire, the effects of impurity backscattering, finite bias, finite temperature, and finite length lead to characteristic non-monotonic parameter dependencies of the average current. We discuss oscillations of the non-linear current voltage characteristics that arise due to reflections of plasmon modes at the impurity and quasi Andreev reflections at the contacts, and show how these oscillations are washed out by decoherence at finite temperature. Furthermore, the finite frequency current noise is investigated in detail. We find that the effective charge extracted in the shot noise regime in the weak backscattering limit decisively depends on the noise frequency $\omega$ relative to $v_F/gL$, where $v_F$ is the Fermi velocity, $g$ the Tomonaga Luttinger interaction parameter, and $L$ the length of the wire. The interplay of finite bias, finite temperature, and finite length yields rich structure in the noise spectrum which crucially depends on the electron-electron interaction. In particular, the excess noise, defined as the change of the noise due to the applied voltage, can become negative and is non-vanishing even for noise frequencies larger than the applied voltage, which are signatures of correlation effects.
Dolcini Fabrizio
Grabert Hermann
Safi Ines
Trauzettel Bjoern
No associations
LandOfFree
Transport properties of single channel quantum wires with an impurity: Influence of finite length and temperature on average current and noise does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Transport properties of single channel quantum wires with an impurity: Influence of finite length and temperature on average current and noise, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transport properties of single channel quantum wires with an impurity: Influence of finite length and temperature on average current and noise will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-530533