Electron-photon interaction associated with uncertainty-based tunneling in a parallel double quantum dot
Kao-Chin Lin, Der-San Chuu
The electron-photon interaction associated with the uncertainty based tunneling (EPAUT) in the parallel double quantum dot system is studied. In the considered system, the electron interacts with the single mode detuning quantum photon field, i.e., ${\ensuremath{\omega}}_{\mathit{ph}}+\ensuremath{\Delta}={\ensuremath{\epsilon}}_{2}\ensuremath{-}{\ensuremath{\epsilon}}_{1}$, and transits between the quantum dots (QDs). The corresponding characteristic temperature is calculated and compared with the Kondo temperature to recognize the role of the related quantities. There are two energy uncertainties in the considered system. One is the energy difference between the energy of electron-photon interacting quasiparticle and the Fermi energy of the lead. The other is the detuning factor $\ensuremath{\Delta}$. Besides, $\ensuremath{\mid}\ensuremath{\Delta}∕\ensuremath{\pi}\ensuremath{\mid}$ is the bandwidth of the intermediate state of EPAUT. The peak of the density of state corresponding to the EPAUT rises when the temperature is in the order of or below the characteristic temperature. The EPAUT peak can be modified via tuning the Fermi energy of the lead connected to the adjoined QD. Hence, the conductance between the connected leads is varied via tuning the Fermi energy of the lead connected to the adjoined QD.
Physical Review B•Mar 20, 2008•1 citation