The coupling of quasiparticle excitations in an electron gas to the LO phonons gives rise to novel phonon modes with energies below qvF. We propose that these low-energy "phonon" modes, in addition to the usual plasmon-phonon coupled modes, are responsible for a large (by orders of magnitude) enhancement of the hot-electron energy-loss rate to the lattice at low electron temperatures, as observed in several recent experiments. Experimental conditions are outlined for an unambiguous observation of this predicted many-body effect.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)