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About Our Research
◇ Ultrafast Dynamics and Quantum information ◇
The interplay between exciton and Floquet states in 2D materials is investigated by time- and angle-resolved photoemission spectroscopy and quantum entanglement. It is found that the interplay forms a temporal novel quantum state, exciton-Floquet composites.
Investigation of attosecond photoelectron emission delay in 2D materials. It is found that the coherent mixing of valence and conduction generated by the optical driving induces a novel attosecond photoemission delay, which contains the Berry curvature signature of the system.
Under electron-phonon interaction Hamiltonian describing a change of the pseudospin direction in a sense of the quantum mechanical rotation (SU(2) rotation), dichroic photoemission of an electron in graphene is studied. Nonvanishing Berry curvatures originated from broken time-reversal symmetry caused by emitted elliptic phonon in the rotation process are detected with time-resolved photoemission spectroscopy.
We investigate HHG and its circular dichroism in undoped monolayer MoS2 with a strain and bias field. The dichroism of HHG captures the nonzero net Berry curvature of the monolayer MoS2.
An asymmetric conducting of the current by forming a heterojunction made of two distinct dielectrics with
a low hole mass (mh≪me) and low electron mass (me≪mh), respectively. This proposition introduces the
novel concept of a petahertz (1015 Hz) diode to rectify the current in the petahertz domain.
Higher-order Fano resonances in attosecond resonant photoemission of copper dichloride.
Bottom left: Phase difference etween photoelectron and Auger electron. Right: Higher-order
Fano resonance bands.
Ultrafast above-transition-temperature resurrection of spin density wave driven in BaFe2As2. Under the
ultrafast optical pumping, a pronounced spin–phonon coupling is found to drive the reconstruction of spin
density wave (SDW) through the coherent phonon generation.
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