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...
Збережено в:
| Видавець: | Відділення фізики і астрономії НАН України |
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| Дата: | 2010 |
| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Відділення фізики і астрономії НАН України
2010
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| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/13289 |
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| Цитувати: | Dynamically Broken Symmetry in Periodically Gated Quantum Dots: Charge Accumulation and DC-current / T. Kwapiński, S. Kohler, P. Hänggi // Укр. фіз. журн. — 2010. — Т. 55, № 1. — С. 85-94. — Бібліогр.: 34 назв. — англ. |
Репозиторії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | 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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