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12 papers
Excitonic and valleytronic signatures of correlated states at fractional fillings of a moiré superlattice
Erfu Liu, Takashi Taniguchi, Kenji Watanabe +3
Moiré superlattices are excellent platforms to realize strongly correlated quantum phenomena, such as Mott insulation and superconductivity. In particular, recent research has reve…
Gate-tunable exciton-polaron Rydberg series with strong roton effect
Erfu Liu, Jeremiah van Baren, Zhengguang Lu +5
The electronic exciton polaron is a hypothetical many-body quasiparticle formed by an exciton dressed with a polarized electron-hole cloud in the Fermi sea (FS). It is predicted to…
Multipath optical recombination of intervalley dark excitons and trions in monolayer WSe
Erfu Liu, Jeremiah van Baren, Ching-Tarng Liang +5
Excitons and trions (or exciton-polarons) in transition metal dichalcogenides (TMDs) are known to decay predominantly through intravalley transitions. Electron-hole recombination a…
Landau-quantized excitonic absorption and luminescence in a monolayer valley semiconductor
Erfu Liu, Jeremiah van Baren, Takashi Taniguchi +3
We investigate Landau-quantized excitonic absorption and luminescence of monolayer WSe under magnetic field. We observe gate-dependent quantum oscillations in the bright excito…
Stacking-Dependent Interlayer Phonons in 3R and 2H MoS
Jeremiah van Baren, Gaihua Ye, Jia-An Yan +6
We have investigated the interlayer shear and breathing phonon modes in MoS with pure 3R and 2H stacking order by using polarization-dependent ultralow-frequency Raman spectr…
Giant intrinsic photoresponse in pristine graphene
Qiong Ma, Chun Hung Lui, Justin C. W. Song +14
When the Fermi level matches the Dirac point in graphene, the reduced charge screening can dramatically enhance electron-electron (e-e) scattering to produce a strongly interacting…