Chiral Transport of Hot Carriers in Graphene in the Quantum Hall Regime.

ABSTRACT: Photocurrent (PC) measurements can reveal the relaxation dynamics of photoexcited hot carriers beyond the linear response of conventional transport experiments, a regime important for carrier multiplication. Here, we study the relaxation of carriers in graphene in the quantum Hall regime by accurately measuring the PC signal and modeling the data using optical Bloch equations. Our results lead to a unified understanding of the relaxation processes in graphene over different magnetic field strength regimes, which is governed by the interplay of Coulomb interactions and interactions with acoustic and optical phonons. Our data provide clear indications of a sizable carrier multiplication. Moreover, the oscillation pattern and the saturation behavior of PC are manifestations of not only the ch

SUBMITTER: Cao B 

PROVIDER: S-EPMC9706666 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature