A5056817881- 2D Materials and Applications
- Perovskite Materials and Applications
- Graphene research and applications
- Organic and Molecular Conductors Research
- Chalcogenide Semiconductor Thin Films
- Strong Light-Matter Interactions
- Plasmonic and Surface Plasmon Research
- Topological Materials and Phenomena
- Stochastic Gradient Optimization Techniques
- Solid-state spectroscopy and crystallography
- Privacy-Preserving Technologies in Data
- Distributed Control Multi-Agent Systems
- Quantum Dots Synthesis And Properties
- MXene and MAX Phase Materials
- Quantum and electron transport phenomena
- Thermal Radiation and Cooling Technologies
- Electronic and Structural Properties of Oxides
- Photonic and Optical Devices
Rensselaer Polytechnic Institute
2019-2023
Abstract Heterobilayers of transition metal dichalcogenides (TMDCs) can form a moiré superlattice with flat minibands, which enables strong electron interaction and leads to various fascinating correlated states. These heterobilayers also host interlayer excitons in type-II band alignment, optically excited electrons holes reside on different layers but remain bound by the Coulomb interaction. Here we explore unique setting interacting strongly electrons, show that photoluminescence (PL)...
Transition metal dichalcogenides (TMDCs) heterostructure with a type II alignment hosts unique interlayer excitons the possibility of spin-triplet and spin-singlet states. However, associated spectroscopy signatures remain elusive, strongly hindering understanding Moiré potential modulation exciton. In this work, we unambiguously identify in WSe2/MoSe2 heterobilayer 60° twist angle through gate- magnetic field-dependent photoluminescence spectroscopy. Both singlet triplet show giant...
Abstract The heterostructure of monolayer transition metal dichalcogenides (TMDCs) provides a unique platform to manipulate exciton dynamics. ultrafast carrier transfer across the van der Waals interface TMDC hetero-bilayer can efficiently separate electrons and holes in intralayer excitons with type II alignment, but it will funnel into one layer I alignment. In this work, we demonstrate reversible switch from dissociation funneling MoSe 2 /WS heterostructure, which manifests itself as...
Monolayer transition-metal dichalcogenides (TMDs) are the first truly two-dimensional (2D) semiconductor, providing an excellent platform to investigate light-matter interaction in 2D limit. The inherently strong excitonic response monolayer TMDs can be further enhanced by exploiting temporal confinement of light nanophotonic structures. Here, we demonstrate a exciton-polariton system strongly coupling atomically thin tungsten diselenide (WSe2) silicon nitride (SiN) metasurface. Via...
Abstract Monolayer transitional metal dichalcogenides (TMDCs), a new class of atomically thin semiconductor, respond to optical excitation strongly with robust excitons, which stem from the reduced screening in two dimensions. These excitons also possess quantum degree freedom known as valley spin, has inspired field valleytronics. The enhanced Coulomb interaction allows exciton bind other particles form excitonic states. However, despite discovery trions, most states monolayer TMDCs remain...
Experiments show for the first time quantization of exciton energies in a 2D semiconductor exposed to high magnetic field, setting stage explorations quantized excitons presence strong Coulomb interactions.
Strong many-body interaction in two-dimensional transitional metal dichalcogenides provides a unique platform to study the interplay between different quasiparticles, such as prominent phonon replica emission and modified valley-selection rules. A large out-of-plane magnetic field is expected modify exciton-phonon interactions by quantizing excitons into discrete Landau levels, which largely unexplored. Here, we observe levels originating from phonon-exciton complexes directly probe under...
A strong Coulomb interaction could lead to a strongly bound exciton with high-order excited states, similar the Rydberg atom. The of giant excitons can be engineered for correlated ordered array blockade, which is promising realizing quantum simulation. Monolayer transition metal dichalcogenides, their greatly enhanced interaction, are an ideal platform host in two dimensions. Here, we employ helicity-resolved magneto-photocurrent spectroscopy identify states up 11s monolayer WSe2. Notably,...
Consider a network of N decentralized computing agents collaboratively solving nonconvex stochastic composite problem. In this work, we propose single-loop algorithm, called DEEPSTORM, that achieves optimal sample complexity for setting. Unlike double-loop algorithms require large batch size to compute the (stochastic) gradient once in while, DEEPSTORM uses small size, creating advantages occasions such as streaming data and online learning. This is first method achieving problems, requiring...
Despite the broadband response, limited optical absorption at a particular wavelength hinders development of optoelectronics based on Dirac fermions. Heterostructures graphene and various semiconductors have been explored for this purpose, while non-ideal interfaces often limit performance. The topological insulator is natural hybrid system, with surface states hosting high-mobility fermions small-bandgap semiconducting bulk state strongly absorbing light. In work, we show large photocurrent...
We demonstrate a 2D exciton-polariton system by strongly coupling atomically thin tungsten diselenide monolayer to silicon nitride metasurface. Our platform opens the door for future development of devices advanced meta-optical engineering.
Despite the broadband response, limited optical absorption at a particular wavelength hinders development of optoelectronics based on Dirac fermions. Heterostructures graphene and various semiconductors have been explored for this purpose, while non-ideal interfaces often limit performance. The topological insulator is natural hybrid system, with surface states hosting high-mobility fermions small-bandgap semiconducting bulk state strongly absorbing light. In work, we show large photocurrent...
Here, we demonstrate a 2D exciton-polariton system by strongly coupling atomically thin tungsten diselenide (WSe2) monolayer to silicon nitride (SiN) metasurface. Via energy-momentum spectroscopy of the WSe2-metasurface system, observed characteristic anti-crossing polariton dispersion both in reflection and photoluminescence spectrum. A Rabi splitting 18 meV was which matched well with our numerical simulation. Moreover, showed that splitting, far-field emission pattern could be tailored...
Consider a network of $N$ decentralized computing agents collaboratively solving nonconvex stochastic composite problem. In this work, we propose single-loop algorithm, called DEEPSTORM, that achieves optimal sample complexity for setting. Unlike double-loop algorithms require large batch size to compute the (stochastic) gradient once in while, DEEPSTORM uses small size, creating advantages occasions such as streaming data and online learning. This is first method achieving problems,...