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Moiré Assisted Fractional Quantum Hall State Spectroscopy
Fengcheng Wu, A. H. MacDonald
Intra-Landau level excitations in the fractional quantum Hall regime are not accessible via optical absorption measurements. We point out that optical probes are enabled by the per…
Trion Valley Coherence in Monolayer Semiconductors
Kai Hao, Lixiang Xu, Fengcheng Wu +8
The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating…
Observation of a Nematic Quantum Hall Liquid on the Surface of Bismuth
Benjamin E. Feldman, Mallika T. Randeria, András Gyenis +5
Nematic quantum fluids with wavefunctions that break the underlying crystalline symmetry can form in interacting electronic systems. We examine the quantum Hall states that arise i…
Topological Exciton Bands in Moiré Heterojunctions
Fengcheng Wu, Timothy Lovorn, A. H. MacDonald
Moiré patterns are common in Van der Waals heterostructures and can be used to apply periodic potentials to elementary excitations. We show that the optical absorption spectrum of…
Microscopic Theory of Equilibrium Polariton Condensates
Fei Xue, Fengcheng Wu, Ming Xie +2
We present a microscopic theory of the equilibrium polariton condensate state of a semiconductor quantum well in a planar optical cavity. The theory accounts for the adjustment of…