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Theoretical studies on quantum dynamics & information
Quantum dynamics enables us to explore fundamental properties of materials and quantum information theory. We theoretically investigate these quantum dynamics and information with model calculation and first-principle density functional theory.
Main frameworks of our study
Coherence, Entanglement, and Quantum information
Ultrafast dynamics and non-equilibrium properties of materials
Semiconducting materials, low-dimensional materials, and strongly-correlated systems
Advanced functional nano applications and their physical principles.
News
A WORK OF FAST ELECTRON DEPHASING HAS BEEN ACCEPTED IN ADVANCED SCIENCE
"Superradiance and broadband emission driving fast electron dephasing in open quantum systems"
Gimin Bae, Youngjae Kim, and J. D. Lee*
Adv. Sci. (accepted 2026).
A WORK OF NOVEL QUANTUM STATES OF EXCITON-FLOQUET COMPOSITES HAS BEEN ACCEPTED IN NANO LETTERS
"Novel quantum states of exciton-Floquet composites: electron-hole entanglement and information"
Hyosub Park, Noejung Park, and J. D. Lee*
Nano Letters 42, 13192-13199 (2024).
A WORK OF BERRY CURVATURE IN THE PHOTOELECTRON EMISSION DELAY HAS BEEN ACCEPTED IN NPJ COMPUT. MATER.
"Berry curvature in the photoelectron emission delay"
Hyosub Park and J. D. Lee*
npj Comput. Mater. 10, 174 (2024).
A WORK OF DEPHASING IN HIGH HARMONIC GENERATIONS HAS BEEN ACCEPTED IN NANO LETTERS
"Dephasing dynamics accessed by high harmonic generation: determination of electron-hole decoherence of Dirac fermions"
Youngjae Kim, Min Jeong Kim, Soonyoung Cha, Shinyoung Choi, Cheol-Joo Kim, B. J. Kim, Moon-Ho Jo, Jonghwan Kim*, J. D. Lee*
Nano Letters 24, 4, 1277–1283, (2024).
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.
npj Comput. Mater. 10, 174 (2024)
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.
Phys. Rev. B 106, 205422 (2022)
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 between 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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