title: Adiabatic Amplification of Plasmons and Demons in 2D Systems.
abstract: We theoretically investigate charged collective modes in a two-dimensional conductor with hot electrons where the instantaneous mode frequencies gradually increase or decrease with time. We show that the loss compensation or even amplification of the modes may occur. We apply our theory to two types of collective modes in graphene, the plasmons and the energy waves, which can be probed in optical pump-probe experiments.
authors: Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093.
authors: Zhiyuan
authors: Z
authors: Sun
authors: Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093.|Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027.
authors: D N
authors: DN
authors: Basov
authors: Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093.
authors: M M
authors: MM
authors: Fogler