Coherent Detection of Electron Dephasing

Coherent detection of electron dephasing.

We show that an Aharonov-Bohm ring with asymmetric electron injection can act as a coherent detector of electron dephasing. The presence of a dephasing source in one of the two arms of a moderately-to-highly asymmetric ring changes the response of the system from total reflection to complete transmission while preserving the coherence of the electrons propagating from the ring, even for strong ...

Optical dephasing of coherent intersubband transitions in a quasi-two-dimensional electron gas

We present a microscopic many-particle theory for the dephasing of coherent intersubband excitations in semiconductor quantum wells including carrier-carrier and carrier-phonon scattering and light propagation effects. The contributions of many-particle processes are nonadditive and thus cannot be treated separately. It is shown that due to nondiagonal correlation contributions, scattering rate...

Possible weak temperature dependence of electron dephasing

The first-principle theory of electron dephasing by disorder-induced two state fluctuators is developed. There exist two mechanisms of dephasing. First, dephasing occurs due to direct transitions between the defect levels caused by inelastic electron-defect scattering. The second mechanism is due to violation of the time reversal symmetry caused by time-dependent fluctuations of the scattering ...

Electron Dephasing in Mesoscopic Metal Wires

The low-temperature behavior of the electron phase coherence time, τφ, in mesoscopic metal wires has been a subject of controversy recently. Whereas theory predicts that τφ(T ) in narrow wires should increase as T as the temperature T is lowered, many samples exhibit a saturation of τφ below about 1 K. We review here the experiments we have performed recently to address this issue. In particula...

Size dependence of electron spin dephasing in InGaAs quantum dots