Research

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 (m_h≪m_e) and low electron mass (m_e≪m_h), 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.