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Dynamically Broken Symmetry in Periodically Gated Quantum Dots: Charge Accumulation and DC-current

Dynamically Broken Symmetry in Periodically Gated Quantum Dots: Charge Accumulation and DC-current

Time-dependent electron transport through a quantum dot and double quantum dot systems in the presence of polychromatic external periodic quantum dot energy-level modulations is studied within the time evolution operator method for a tight-binding Hamiltonian. Analytical relations for the dc-current...

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Bibliographic Details
Main Authors: Kwapiński, T., Kohler, S., Hänggi, P.
Format: Article
Language:English
Published: Відділення фізики і астрономії НАН України 2010
Subjects:
Наносистеми
Online Access:http://dspace.nbuv.gov.ua/handle/123456789/13289
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Summary:Time-dependent electron transport through a quantum dot and double quantum dot systems in the presence of polychromatic external periodic quantum dot energy-level modulations is studied within the time evolution operator method for a tight-binding Hamiltonian. Analytical relations for the dc-current flowing through the system and the charge accumulated on a quantum dot are obtained for the zero-temperature limit. It is shown that, in the presence of periodic perturbations, the sideband peaks of the transmission are related to the combination of frequencies of the applied modulations. For a double quantum dot system under the influence of polychromatic perturbations, the quantum pump effect is studied in the absence of a source (drain) and static bias voltages. In the presence of a spatial symmetry, the charge is pumped through the system due to a broken generalized parity symmetry.

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