Determination of the electronic phase coherence time in one-dimensional channels

Abstract

We utilize the weak-localization effect in an array of one-dimensional channels to perform a quantitative measurement of the electronic phase coherence time at temperatures between 100 mK and 4.2 K in the two-dimensional electron gas formed in a ${\mathrm{G}\mathrm{a}\mathrm{A}\mathrm{s}/\mathrm{A}\mathrm{l}}_x{\mathrm{Ga}}_{1-x}\mathrm{As}$ heterostructure. The measured times agree well with theories of dephasing based on electron-electron scattering.