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• W2000535093 abstract "The electrical current noise of a quantum wire is expected to increase with increasing applied voltage. We show that this intuition can be wrong. Specifically, we consider a single channel quantum wire with impurities and with a capacitive coupling to nearby metallic gates and find that its excess noise, defined as the change in the noise caused by the finite voltage, can be negative at zero temperature. This feature is present both for large ($c gg c_q$) and small ($c ll c_q$) capacitive coupling, where $c$ is the geometrical and $c_q$ the quantum capacitance of the wire. In particular, for $c gg c_q$, negativity of the excess noise can occur at finite frequency when the transmission coefficients are energy dependent, i.e. in the presence of Fabry-P'erot resonances or band curvature. In the opposite regime $c lesssim c_q$, a non trivial voltage dependence of the noise arises even for energy independent transmission coefficients: at zero frequency the noise decreases with voltage as a power law when $c < c_q/3$, while, at finite frequency, regions of negative excess noise are present due to Andreev-type resonances." @default.
• W2000535093 created "2016-06-24" @default.
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• W2000535093 date "2007-01-19" @default.
• W2000535093 modified "2023-10-01" @default.
• W2000535093 title "Negativity of the excess noise in a quantum wire capacitively coupled to a gate" @default.
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• W2000535093 doi "https://doi.org/10.1103/physrevb.75.045332" @default.
• W2000535093 hasPublicationYear "2007" @default.
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