935 resultados para asymmetrical pumping
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"15 August 1984."
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"October 1992."
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"March 1985."
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Includes index.
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Includes index.
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Includes index.
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"23 July 1990."
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"May 1968."
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Mode of access: Internet.
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"January 1974."
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Mode of access: Internet.
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Mode of access: Internet.
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Geometric phases of scattering states in a ring geometry are studied on the basis of a variant of the adiabatic theorem. Three timescales, i.e., the adiabatic period, the system time and the dwell time, associated with adiabatic scattering in a ring geometry play a crucial role in determining geometric phases, in contrast to only two timescales, i.e., the adiabatic period and the dwell time, in an open system. We derive a formula connecting the gauge invariant geometric phases acquired by time-reversed scattering states and the circulating (pumping) current. A numerical calculation shows that the effect of the geometric phases is observable in a nanoscale electronic device.