Determination of topological edge quantum numbers of fractional quantum Hall phases by thermal conductance measurements.

ABSTRACT: To determine the topological quantum numbers of fractional quantum Hall (FQH) states hosting counter-propagating (CP) downstream (N_d) and upstream (N_u) edge modes, it is pivotal to study quantized transport both in the presence and absence of edge mode equilibration. While reaching the non-equilibrated regime is challenging for charge transport, we target here the thermal Hall conductance G_Q, which is purely governed by edge quantum numbers N_d and N_u. Our experimental setup is realized with a hexagonal boron nitride (hBN) encapsulated graphite gated single layer graphene device. For temperatures up to 35 mK, our measured G_Q at ν = 2/3 and 3/5 (with CP modes) match the quantized values of non-equilibrated regime (N_d

SUBMITTER: Srivastav SK 

PROVIDER: S-EPMC9440925 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature