Welcome to
 


Materials theory


 Materials theory is a way to understand properties of emergent materials using theoretical approach. We use computational methods performed on model calculation and first-principle density functional theory to study new physics of the materials.



     Main frameworks of our study 
  • Semiconducting, magnetic, relativistic and superconducting properties of emergent materials.
  • Ultrafast time-resolved study of photophysical processes.
  • Advanced functional nano applications and their physical principles.


          News          
  • A WORK OF VALLEY MAGNETIC DOMAIN HAS BEEN PUBLISHED IN NANO LETTERS
    https://pubs.acs.org/doi/10.1021/acs.nanolett.9b01676
    "Anomalous electron dynamics induced through the valley magnetic domain: a pathway to the valleytronic current processing"

    Youngjae Kim and JaeDong Lee*

    Nano Lett. 19, 6, 4166-4173 (2019)

    Posted Jun 12, 2019, 6:09 PM by LMTL DGIST
  • A WORK OF VALLEY VALVE HAS BEEN PUBLISHED IN PHYS. REV. APPLIED
    https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.11.034048
    "Proposed valley valve from four-channel valley manipulation"

    Youngjae Kim and JaeDong Lee*

    Phys. Rev. Applied 11, 034048 (2019)

    Posted Mar 24, 2019, 8:56 PM by LMTL DGIST
  • A WORK OF RHENIUM DISULFIDE HAS BEEN PUBLISHED IN LIGHT: Sci. & Appl. (IF = 13.625; optics 2.66%)
    https://www.nature.com/articles/s41377-018-0100-3?WT.feed_name=subjects_physical-sciences
    "Probing the Upper Band Gap of the Atomic Rhenium Disulfide Layers"

    Krishna P. Dhakal, Hyunmin Kim*, Seonwoo Lee, Youngjae Kim, JaeDong Lee*, and Jong-Hyun Ahn*

    Light: Science & Applications 7, 98 ( 2018).

    Posted Mar 19, 2019, 6:54 PM by LMTL DGIST
  • A WORK OF PETAHERTZ SPIN CONTROL HAS BEEN PUBLISHED IN Phys. Rev. B: Rapid Communications
    https://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.041105
    "Manipulating light-wave-controlled charges into a spin-asymmetric flow: Petahertz frequency control of spins"

    Youngjae Kim and J.D. Lee*

    Phys. Rev. B 97, 041105(R) (2018).

    Posted Nov 8, 2018, 6:33 PM by LMTL DGIST
Showing posts 1 - 4 of 9. View more »

        About Our Research        

◇ Emerging materials and their hybrids 


https://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.125420
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.


http://pubs.acs.org/doi/abs/10.1021/jp510308a
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.


http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b02232

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 



http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.057401
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.


http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.027401
 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.


http://iopscience.iop.org/article/10.1088/1367-2630/16/4/043010/meta;jsessionid=DCF3C197DF51857A459F651572731A0E.c3.iopscience.cld.iop.org
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.