Q-Valley Quasiparticle Interference in Few-Layer Transition Metal Dichalcogenides

Quantum transport experiments have provided compelling evidence for the threefold flavors of the Q-valley electrons in few-layer transition metal dichalcogenides (TMD). We study the quasiparticle interference (QPI) due to Q-valley electrons scattering off localized impurities, which modifies the local density of states. In the quantum Hall regime, all the TMD odd-layers thicker than bilayer exhibit Landau level triplets. When a Landau level triplet is one-third filled or empty, the flavor SU(3) symmetry is broken in the ferroelectric nematic ground states tunable by an in-plane electric field and an out-of-plane magnetic field. We show the QPI patterns of such flavor states, which can be probed by scanning tunneling spectroscopy.