78 citations · 714 across the 28 of their papers we have counts for
20 papers · 1 filter
Couplings between Photons and Ensemble of Emitters in a High- Cavity at Mesoscopic Excitation Levels
Chenjiang Qian, Viviana Villafañe, Pedro Soubelet +2
We investigate the coupling between an ensemble of individual emitters and multiple photons in a high- cavity at the mesoscopic excitation level. The master equation theory is u…
Probing Dark Excitons in Monolayer MoS by NonLinear Two-Photon Spectroscopy
Chenjiang Qian, Viviana Villafañe, Pedro Soubelet +3
We report a new dark exciton in monolayer MoS using second harmonic generation spectroscopy. Hereby, the spectrally dependent second harmonic generation intensity splits into t…
Thickness Insensitive Nanocavities for 2D Heterostructures using Photonic Molecules
Peirui Ji, Chenjiang Qian, Jonathan J. Finley +1
Two-dimensional (2D) heterostructures integrated into nanophotonic cavities have emerged as a promising approach towards novel photonic and opto-electronic devices. However, the th…
Strain control of exciton and trion spin-valley dynamics in monolayer transition metal dichalcogenides
Zhao An, Pedro Soubelet, Yaroslav Zhumagulov +10
The electron-hole exchange interaction is a fundamental mechanism that drives valley depolarization via intervalley exciton hopping in semiconductor multi-valley systems. Here, we…
Lasing of Moiré Trapped MoSe/WSe Interlayer Excitons Coupled to a Nanocavity
Chenjiang Qian, Mirco Troue, Johannes Figueiredo +8
We report lasing of moiré trapped interlayer excitons (IXs) by integrating a pristine hBN-encapsulated MoSe/WSe heterobilayer into a high- () nanophotonic cavity.…
Emitter-Optomechanical Interaction in Ultra-High-Q hBN Nanocavities
Chenjiang Qian, Viviana Villafañe, Martin Schalk +6
Integrating quantum emitters into nanocavities which simultaneously couple to the photonic and mechanical modes is critical for interfacing electron spins, photons and phonons in t…
Coupling of MoS Excitons with Lattice Phonons and Cavity Vibrational Phonons in Hybrid Nanobeam Cavities
Chenjiang Qian, Viviana Villafañe, Marko M. Petrić +3
We report resonant Raman spectroscopy of neutral excitons X and intravalley trions X in hBN-encapsulated MoS monolayer embedded in a nanobeam cavity. By temperature tun…
Unveiling the Zero-Phonon Line of the Boron Vacancy Center by Cavity Enhanced Emission
Chenjiang Qian, Viviana Villafañe, Martin Schalk +11
Negatively charged boron vacancies () in hexagonal boron nitride (hBN) exhibit a broad emission spectrum due to strong electron-phonon coupling and Jahn-Teller mixing of ele…
Nonlocal Exciton-Photon Interactions in Hybrid High-Q Beam Nanocavities with Encapsulated MoS Monolayers
Chenjiang Qian, Viviana Villafañe, Pedro Soubelet +7
Atomically thin semiconductors can be readily integrated into a wide range of nanophotonic architectures for applications in quantum photonics and novel optoelectronic devices. We…
Large photoluminescence enhancement by an out-of-plane magnetic field in exfoliated WS flakes
Sibai Sun, Jianchen Dang, Xin Xie +11
We report an out-of-plane magnetic field induced large photoluminescence enhancement in WS flakes at K, in contrast to the photoluminescence enhancement provided by in-pl…
Identifying defect-related quantum emitters in monolayer WSe
Jianchen Dang, Sibai Sun, Xin Xie +12
Monolayer transition metal dichalcogenides have recently attracted great interests because the quantum dots embedded in monolayer can serve as optically active single photon emitte…
Hot Polarons with Trapped Excitons and Octahedra-Twist Phonons in CH3NH3PbBr3 Hybrid Perovskite Nanowires
Feilong Song, Chenjiang Qian, Yunuan Wang +13
Hybrid Perovskites have shown a great potential for applications in photovoltaics and light-emitting devices with high efficiency. Interaction between defect-induced trapped excito…
Anisotropies of the g-factor tensor and diamagnetic coefficient in crystal-phase quantum dots in InP nanowires
Shiyao Wu, Kai Peng, Sergio Battiato +17
Crystal-phase low-dimensional structures offer great potential for the implementation of photonic devices of interest for quantum information processing. In this context, unveiling…
Many-Body Effect of Mesoscopic Localized States in MoS Monolayer
Yang Yu, Jianchen Dang, Chenjiang Qian +13
Transition metal dichalcogenide monolayers provide an emerging material system to implement quantum photonics with intrinsic two-dimensional excitons or embedded zero-dimensional l…
Large g factor in bilayer WS flakes
Sibai Sun, Yang Yu, Jianchen Dang +15
The valley of transition metal dichalcogenides provides an additional platform to manipulate spin due to its unique selection rule. Normally, intralayer optical transitions in magn…
Tuning the carrier tunneling in a single quantum dot with a magnetic field in Faraday geometry
Kai Peng, Shiyao Wu, Xin Xie +8
We report on an increase in the carrier tunneling time in a single quantum dot (QD) with a magnetic field in Faraday geometry using photocurrent spectroscopy. A nearly 60\% increas…
Giant Photocurrent Enhancement by Coulomb Interaction in a Single Quantum Dot for Energy Harvesting
Kai Peng, Shiyao Wu, Xin Xie +9
Understanding the carrier excitation and transport processes at the single-charge level plays a key role in quantum-dot-based solar cells and photodetectors. Here, we report on Cou…
High-Responsivity Photodetection by Self-Catalyzed Phase-Pure P-GaAs Nanowire
Hassan Ali, Yunyan Zhang, Jing Tang +13
Defects are detrimental for optoelectronics devices, such as stacking faults can form carrier-transportation barriers, and foreign impurities (Au) with deep-energy levels can form…
Probing the dark exciton states of a single quantum dot using photocurrent spectroscopy in magnetic fields
Kai Peng, Shiyao Wu, Jing Tang +8
We report on high-resolution photoluminescence (PL) and photocurrent (PC) spectroscopies of a single self-assembled InAs/GaAs quantum dot (QD) embedded in an n-i-Schottky device wi…
Observation of coupling between zero- and two-dimensional semiconductor systems based on anomalous diamagnetic effects
Shuo Cao, Jing Tang, Yue Sun +13
We report the direct observation of coupling between a single self-assembled InAs quantum dot and a wetting layer, based on strong diamagnetic shifts of many-body exciton states us…