Quantum dynamics, dissipation, and asymmetry effects in quantum dot arrays

Details Quantum dynamics, dissipation, and asymmetry effects in quantum dot arrays Quantum dynamics, dissipation, and asymmetry effects in quantum dot arrays

2002-07-03

arxiv.org/abs/cond-mat/0207109v1

Phys. Rev. B, 66, 235305(2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11pages,9 figures(eps), submitted to PRB

Scientific paper

10.1103/PhysRevB.66.235305

We study the role of dissipation and structural defects on the time evolution of quantum dot arrays with mobile charges under external driving fields. These structures, proposed as quantum dot cellular automata, exhibit interesting quantum dynamics which we describe in terms of equations of motion for the density matrix. Using an open system approach, we study the role of asymmetries and the microscopic electron-phonon interaction on the general dynamical behavior of the charge distribution (polarization) of such systems. We find that the system response to the driving field is improved at low temperatures (and/or weak phonon coupling), before deteriorating as temperature and asymmetry increase. In addition to the study of the time evolution of polarization, we explore the linear entropy of the system in order to gain further insights into the competition between coherent evolution and dissipative processes.

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