Volume 125, Number 6, March 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||06 May 2019|
Current noise spectrum in a solvable model of tunneling Fermi-edge singularity
1 Nonlinearity and Complexity Research Group, Aston University - Birmingham B4 7ET, UK
2 Institute of Microelectronics Technology RAS - 142432 Chernogolovka, Russia
Received: 1 June 2018
Accepted: 28 March 2019
We consider tunneling of spinless electrons from a single-channel emitter into an empty collector through an interacting resonant level of the quantum dot (QD). When all Coulomb screening of sudden charge variations of the dot during the tunneling is realized by the emitter channel, the system is mapped onto an exactly solvable model of a dissipative qubit. The qubit density matrix evolution is described with a generalized Bloch equation which permits us to count the tunneling electrons and find the charge transfer statistics. The two generating functions of the counting statistics of the charge transferred during the QD evolutions from its stationary and empty state have been expressed through each other. It is used to calculate the spectrum of the steady current noise and to demonstrate the occurrence of the bifurcation of its single zero-frequency minimum into two finite-frequency dips due to the qubit coherent dynamics.
PACS: 73.40.Gk – Tunneling / 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect) / 03.67.Bg – Entanglement production and manipulation
© EPLA, 2019
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