DOI: 10.5061/dryad.f1vhhmh38
title: Lasing of moiré trapped MoSe2/WSe2 interlayer excitons coupled to a nanocavity

description: Moiré trapped interlayer excitons (IXs) in heterobilayer transition metal
 dichalcogenides currently attract strong interest due to their potential
 for non-classical light generation, coherent spin-photon interfaces and
 exploring novel correlated phases of electrons. Here, we report lasing of
 moiré trapped IXs by integrating a pristine hBN-encapsulated MoSe2/WSe2
 heterobilayer in a high-Q (&gt; 104) nanophotonic cavity. We control
 the detuning between the IX line and the cavity mode with a magnetic field
 and measure the dipolar coupling strength to the cavity mode to be 78 ± 4
 μeV, fully consistent with the 82 μeV predicted by theory. The emission
 from the cavity mode shows clear threshold-like behavior. We observe a
 superlinear power dependence accompanied by a narrowing of the linewidth
 as the distinct features of lasing. The onset and prominence of these
 threshold-like behaviors are significant at resonance whilst weak
 off-resonance. Our results show that a lasing transition can be induced in
 interacting moiré trapped IXs with macroscopic coherence extending over
 the lengthscale of the cavity mode. Such systems raise interesting
 perspectives for low-power switching and synaptic nanophotonic devices
 using 2D materials.
description: # · Lasing of Moiré Trapped MoSe2/WSe2 Interlayer Excitons Coupled to a
 Nanocavity These datasets
 were collected using the confocal micro-photoluminescence (PL) setup for
 the spectroscopy of cavity-moiré interlayer exciton (IX) coupling. We
 controlled the excitation power and exciton-photon detuning to demonstrate
 the coupling and lasing in the system. We further investigated the system
 with the excitation laser at different wavelength to manipulatie the
 exciton photo-physics and the non-linearity in lasing. ## Description of
 the data and file structure * Coupling.opju is the data for exciton-photon
 coupling at low excitation power. * In folder 1c, "PLs-noise
 corrected" is the figure and corresponding data for the magneto PL
 spectra. "PLs-raw" is the raw data before noise datapoints are
 corrected. * In folder 1b, "step1 PLs-baseline subtracted" is
 the data in which the emission baseline is subtracted. "step2 fit
 g" is the cavity peak linewidth extracted by fitting the data in
 "step1 PLs-baseline subtracted". The second fitting of the
 cavity peak linewidth in "step2 fit g" shows the exciton-photon
 coupling strength *g*. * Lasing.opju is the power- and detuning- dependent
 data to demonstrate the lasing. * Four folders "0.5T",
 "1.8T", "4T", "7T" correspond to the
 power-dependent spectra recorded at different magnetic fields. The
 different magnetic fields correspond to different exciton-photon detuning.
 In each folder, "PLs-raw" is the raw data, "PLs-baseline
 subtracted" is the data in which the emission baseline is subtracted,
 and "fit" is the power-dependent cavity peak intensity and
 linewidth extracted by fitting the data in "PLs-baseline
 subtracted". The lasing phenomena, i.e., non-linearity and linewidth
 narrowing, is significant near the exciton-photon resonance (0.5T and
 1.8T) whilst weak off-resonance (4T and 7T), demonstrating the lasing
 arising from exciton-photon coupling. * Lasing_532nm.opju is the control
 experiment under the green laser excitation. * Two folders
 "Mode1" and "Mode2" correspond to the power-dependent
 spectra recorded from two different cavity modes. In each folder,
 "PLs-raw" is the raw data, "PLs-baseline subtracted"
 is the data in which the emission baseline is subtracted, and
 "fit" is the power-dependent cavity peak intensity and linewidth
 extracted by fitting the data in "PLs-baseline subtracted".
 Under the green laser excitation, the lasing phenomena, i.e.,
 non-linearity and linewidth narrowing, is significant compared to the red
 laser excitation in "Lasing.opju".