Embedded Files
Emergence of dark exciton under strong magnetic field. Nature Nano 12.9 (2017): 883
Electrical detection of valley-polarized exciton transport. PRL2019, 122(12): 127401
2D semiconductor :
2D semiconductor :
Excitonic physics and valley optics
Excitonic physics and valley optics
The correlated electron-hole pairs, aka excitons, are quasiparticles in materials that are created with photon excitation. The unqiue excitonic properties and strong exciton-exciton interactions in monolayers of transition metal dichalcogenides will be one of our main focuses.
With new designs of 2D heterostructure and devices , we are interested in utilizing the optically-accessible pseudospin, the valley degree of freedom, to realize quantum operation. We are also interested in exploring the strong many-body interactions for multi-excitonic complex.
Schematics for pump-probe measurements of magnonic interactions and formation.
2D magnets:
2D magnets:
Ultrafast spin dynamics and manipulation
Ultrafast spin dynamics and manipulation
Atomically-thin magnetic materials are of great interest for their long-rang order at reduced dimension, while offering great potential to manipulate magnetism with more flexible approaches and with photons.
Time-resolved spectrum of magnetic oscillations in bilayer CrI3 (AFM) which contains multiple magnon modes.
We aim to probe the 2D spin dynamics and order formation under non-equilibirum condition with femtosecond laser pulses. Collective spin waves (magnon) transport, interfacial spin interactions and proximiy, and ultrafast spin switching are our current research interests.
Experimental technique
Experimental technique
2D material nanofabrication
2D heterostructures and device geometry for optics and transport measurement; Inert-gas environment for air-sensitive material fabrication;
Optical spectroscopy
Absoprtion; Photoluminescnece; Raman etc.;
Ultrafast spectroscopy
Time-resolved & spatially resolved spectroscopys; Pump-probe spectroscopy; Non-linear physics at high photon density;
Optoelectronics
Scanning photocurrent; Photogalvanic effects; Electroluminescence etc.。
Working with Maglab
We work closely with NHMFL in Tallahassee (DC) and High B/T at UF to perform magneto-optical measurements under high magnetic fields. We also work on facility developments for new micron-optical setups in magnet cells.
Glovebox system for 2D material transfer and device fabrication
Ultrafast laser (Coherent Ti:Sapphire + OPO)
Free space imaging and micron-optics setup in NHMFL DC Field Cell 5.
Helium-free magneto-optical cryostat
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