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Conductance fluctuations in a quantum dot under almost periodic ac pumping | | Xiao-Bing Wang
; V.E.Kravtsov
; | | Date: |
13 Aug 2000 | | Journal: | Phys. Rev. B, 64 (2001) 033313 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Abstract: | It is shown that the variance of the linear dc conductance fluctuations in an open quantum dot under a high-frequency ac pumping depends significantly on the spectral content of the ac field. For a sufficiently strong ac field $gamma au_{phi}<< 1$, where $1/ au_{phi}$ is the dephasing rate induced by ac noise and $gamma$ is the electron escape rate, the dc conductance fluctuations are much stronger for the harmonic pumping than in the case of the noise ac field of the same intensity. The reduction factor $r$ in a static magnetic field takes the universal value of 2 only for the white--noise pumping. For the strictly harmonic pumping $A(t)=A_{0}cosomega t$ of sufficiently large intensity the variance is almost insensitive to the static magnetic field $r-1= 2sqrt{ au_{phi}gamma} << 1$. For the quasi-periodic ac field of the form $A(t)=A_{0} [cos(omega_{1} t)+cos(omega_{2} t)]$ with $omega_{1,2} >> gamma$ and $gamma au_{phi} << 1$ we predict the novel effect of enchancement of conductance fluctuations at commensurate frequencies $omega_{2}/omega_{1}=P/Q$. | | Source: | arXiv, cond-mat/0008193 | | Services: | Forum | Review | PDF | Favorites | |
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