Ehrenfest-time-dependent suppression of weak localization

The Ehrenfest time dependence of the suppression of the weak localization correction to the conductance of a clean chaotic cavity is calculated. Unlike in earlier work, no impurity scattering is invoked to imitate diffraction effects. The calculation extends the semiclassical theory of Richter and Sieber Phys. Rev. Lett. 89, 206801 (2002) to include the effect of a finite Ehrenfest time.