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- W2612321024 abstract "We consider tunneling of spinless electrons from a single-channel emitter into an empty collector through an interacting resonant level of the quantum dot. When all Coulomb screening of sudden charge variations of the dot during the tunneling is realized by the emitter channel, the system is described with an exactly solvable model of a dissipative qubit. To study manifestations of the coherent qubit dynamics in the collector ac response we derive a solution to the corresponding Bloch equation for the model quantum evolution in the presence of the oscillating voltage of frequency $ensuremath{omega}$ and calculate perturbatively the ac response in the voltage amplitude. We have shown that in a wide range of the model parameters the coherent qubit dynamics results in the nonzero frequencies resonances in the amplitudes dependence of the ac harmonics and in the jumps of the harmonics phase shifts across the resonances. In the first order the ac response is directly related to the spectral decomposition of the corresponding transient current and contains only the first $ensuremath{omega}$ harmonic, whose amplitude exhibits resonance at $ensuremath{omega}={ensuremath{omega}}_{I}$, where ${ensuremath{omega}}_{I}$ is the qubit oscillation frequency. In the second order we have obtained the $2ensuremath{omega}$ harmonic of the ac response with resonances in the frequency dependence of its amplitude at ${ensuremath{omega}}_{I},phantom{rule{0.16em}{0ex}}{ensuremath{omega}}_{I}/2$ and zero frequency and also have found the frequency dependent shift of the average steady current." @default.
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- W2612321024 date "2017-05-12" @default.
- W2612321024 modified "2023-10-16" @default.
- W2612321024 title "Probing qubit dynamics at the tunneling Fermi-edge singularity with alternating current" @default.
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- W2612321024 doi "https://doi.org/10.1103/physrevb.95.205416" @default.
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