122 citations · 298 across the 9 of their papers we have counts for
9 papers
Carrier Multiplication via Photocurrent Measurements in Dual-Gated MoTe_2
Jun Suk Kim, Minh Dao Tran, Sung-Tae Kim +4
Although van der Waals layered transition metal dichalcogenides from transient absorption spectroscopy have successfully demonstrated an ideal carrier multiplication (CM) performan…
Bandgap renormalization in monolayer MoS_2 on CsPbBr_3 quantum dot via charge transfer at room temperature
Subash Adhikari, Ji-Hee Kim, Bumsub Song +9
Many-body effect and strong Coulomb interaction in monolayer transition metal dichalcogenides lead to shrink the intrinsic bandgap, originating from the renormalization of electric…
Band restructuring of ordered/disordered blue TiO2 for visible photocatalyst
Simgeon Oh, Ji-Hee Kim, Hee Min Hwang +6
Black TiO2 with/without noble metal has been proposed for visible photocatalyst, still leaving poor catalyst efficiency. Alternatively, phase-mixed TiO2 such as anatase and rutile…
Highly Efficient Carrier Multiplication in van der Waals layered Materials
Ji-Hee Kim, Matthew R. Bergren, Jin Cheol Park +8
Carrier multiplication (CM), a photo-physical process to generate multiple electron-hole pairs by exploiting excess energy of free carriers, is explored for efficient photovoltaic…
Ultrafast Generation of Fundamental and Multiple-order Phonon Excitations in Highly-Enriched (6,5) Single-Wall Carbon Nanotubes
Y. -S. Lim, A. R. T. Nugraha, S. -J. Cho +14
Using a macroscopic ensemble of highly-enriched (6,5) single-wall carbon nanotubes, combined with high signal-to-noise ratio, time-dependent differential transmission spectroscopy,…
Fermi-Edge Superfluorescence from a Quantum-Degenerate Electron-Hole Gas
J. -H. Kim, G. T. Noe, S. A. McGill +4
We report on the observation of spontaneous bursts of coherent radiation from a quantum-degenerate gas of nonequilibrium electron-hole pairs in semiconductor quantum wells. Unlike…
Giant Superfluorescent Bursts from a Semiconductor Magnetoplasma
G. T. Noe, J. -H. Kim, J. Lee +6
Currently, considerable resurgent interest exists in the concept of superradiance (SR), i.e., accelerated relaxation of excited dipoles due to cooperative spontaneous emission, fir…
Resonant Coherent Phonon Generation in Single-Walled Carbon Nanotubes through Near-Band-Edge Excitation
Y. -S. Lim, J. -G. Ahn, J. -H. Kim +6
We have observed large-amplitude coherent phonon oscillations of radial breathing modes (RBMs) in single-walled carbon nanotubes excited through the lowest-energy (E11) interband t…
Coherent Lattice Vibrations in Carbon Nanotubes
Y. S. Lim, K. J. Yee, J. H. Kim +6
We have generated and detected the radial-breathing mode of coherent lattice vibrations in single-walled carbon nanotubes using ultrashort laser pulses. Because the band gap is a f…