Dephasing of the Quantum Interference Effect in Open Ballistic Billiards(Condensed Matter : Electronic Strucuture, Electrical, Magnetic and Optical Properties)

概要

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Quantum interference corrections to conductance are suppressed by the dephasing due to electron-electron interactions. The dephasing in open ballistic billiards is studied at low temperatures. It is shown that if the classical electron motion is chaotic, the interference correction arising from a time-reversed pair of paths with duration r is suppressed by the factor of exp(-τ/τ_φ), where τ_φ should be identified as the dephasing time. Consequently, the weak-localization correction to conductance is suppressed by the factor of 1/(1 + t_B/τ_φ) (t_B: classical escape time). In contrast, it is also shown that the interference correction in non-chaotic billiards (i.e., integrable or mixed case) cannot be characterized by such a simple exponential decay. This implies that the dephasing time is not well defined in non-chaotic billiards.
社団法人日本物理学会の論文
2002-11-15