Publications
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Phonon assisted absorption in transition metal dichalcogenide heterostructures
Physical Review B. 113, 235306 (2026)
By developing a nonperturbative theoretical framework for phonon-assisted absorption in van der Waals heterostructures, a closed-form expression for the optical absorption spectrum at arbitrary temperatures is presented, explaining key experimental observations of vibronic exciton states.
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Candidate for a fractional topological insulator in twisted molybdenum ditelluride
Physical Review X, 16, 031009 (2026)
The interplay among electronic correlation, topology, and time-reversal symmetry often leads to exotic quantum states of matter. Pump-probe circular dichroism measurements give the strongest evidence yet of a fractional topological insulator state.
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Photoinduced metal-to-insulator transitions in 2D moiré device
Physical Review Letters 136, 206502 (2026), Editor’s Suggestion
An ultrafast metal-to-insulator transition is demonstrated in gate-doped 2D moire ́ devices using photothermionic hole injection from graphite gates.
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Ultrafast charge-doping via photo-thermionic injection in van der Waals devices
Physical Review B. 113, 195135 (2026), Editor’s Suggestion
We establish an ultrafast photodoping mechanism in the moiré bilayer from photo-thermionic emission of the graphite gates. Using transient reflectance experiments, we reveal photo-induced hole injection, a novel ultrafast transport probe for future work on vibronics in energy and time.
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Brightening interlayer excitons by electric-field-driven hole transfer in bilayer tungsten diselenide
Physical Review Letters 136, 096903 (2026), Editor’s Suggestion
Reflectance spectroscopy reveals that an electric field distorts valence-band Bloch states in bilayer semiconductor devices, driving the hole wavefunction from one layer to the other. Such wavefunction engineering is being explored to engineer exciton-vibrational coupling.
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Electrically Switching ferroelectric order in 3R-molybdenum disulfide layers
Nano Letters 25, 1459 (2025)
Reflection and photoluminescence spectroscopy measurements reveal sharp shifts in excitonic spectra at different critical electric fields, arising from lateral displacements between the layers. This uniquely controllable phenomenon will advance future investigations of anharmonic vibronic coupling.
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Hidden states and dynamics of fractional fillings in twisted molybdenum ditelluride bilayers
Nature 641, 1149–1155 (2025)
Transient optical spectroscopy on twisted molybdenum ditelluride reveals nearly 20 hidden states at fractional fillings that are absent in static optical sensing or transport measurements, giving insight into novel vibronic coupling of correlated states.