About Our Research        

◇ Emerging materials and their hybrids 

The strong molybdenum-bismuth band hybridization together with a generation of the interfacial 
dipole field induces the giant Rashba-type splitting accompanying the proper spin topology
 in molybdenum-driven bands at the Γ point.

We investigate the strain-induced electronic and magnetic properties of single-layer (1L) MoS2 with
 vacancy defects using the density functional theory calculation. When the tensile strain is applied, 
1L-MoS2 with vacancy becomes ferromagnetic and metallic.


Optical absorption spectra of AMoS2NRs show the exciton multibands (their binding energies are close to or 
less than 1 eV) which are much stronger than a single layer of MoS2. However, they are absent in the spectra 
by the approach of GW and the random phase approximation (RPA). This signifies that the excitonic correlation 
effects are strongly enhanced in the reduced dimensional structure of MoS2

 External electric field driven renormalized velocity of spin filtered-massless Dirac fermions in functionalized 
GaBi giant topological insulator.

◇ Extreme ultrafast phenomena 

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 
 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.