Abstract
We calculate the mobility of a heavy particle coupled to a Fermi sea within a nonperturbative approach valid at all temperatures. The interplay of particle recoil and of strong-coupling effects, leading to the orthogonality catastrophe for an infinitely heavy particle, is carefully taken into account. We find two novel types of strong-coupling effects: a new low-energy scale and a giant mass renormalization in the case of either near-resonant scattering or a large transport cross section , respectively. The mobility is shown to obey two different power laws below and above . For , where is the Fermi wavelength, an exponentially large effective mass suppresses the mobility.
- Received 5 January 1998
DOI:https://doi.org/10.1103/PhysRevLett.80.4705
©1998 American Physical Society