News

[Moohyun Ahn, Prof. Byeongsu Yang and Prof. Jonghee Yoo] Searching for Invisible Axion Dark Matter w... Dec 5, 2022 l Hit 351

The axion has been postulated to solve the strong-CP problem in quantum chromodynamics, and it is a strong candidate for dark matter. Axion can couple to magnetic fields and convert to electromagnetic waves. Using this property, one can probe the dark matter axions. Our research team built a dark matter axion det...

[Kunihiro Yananose and Prof. Jaejun Yu] Growth of bilayer MoTe2 single crystals with strong non-line... Sep 21, 2022 l Hit 1838

The reduced symmetry in strong spin-orbit coupling materials such as transition metal ditellurides (TMDTs) gives rise to non-trivial topology, unique spin texture, and large charge-to-spin conversion efficiencies. Bilayer TMDTs are non-centrosymmetric and have unique topological properties compared to monolayer or tril...

[Kyeong-Yoon Baek, Dr. Jeongjae Lee, Prof. Tae-Woo Lee, Prof. Keehoon Kang & Prof. Takhee Lee] Mecha... Jul 25, 2022 l Hit 1990

Embedding metal–halide perovskite particles within an insulating host matrix has proven to be an effective strategy for revealing the outstanding luminescence properties of perovskites as an emerging class of light emitters. Particularly, unexpected bright green emission observed in a nominally pure zero-dimensio...

[KW An's Group] A photonic quantum engine driven by superradiance Jul 25, 2022 l Hit 2683

Performance of nano- and microscale heat engines can be improved with the help of quantum-mechanical phenomena. Recently, heat reservoirs with quantum coherence have been proposed to enhance engine performance beyond the Carnot limit even with a single reservoir. However, no physical realizations have been achieved so ...

[Jehyun Kim, Jonginn Yun, Wonjin Jang and Prof. Dohun Kim] Approaching Ideal Visibility in Singlet-T... Jul 21, 2022 l Hit 1298

We report energy-selective tunneling readout-based Hamiltonian parameter estimation of a two-electron spin qubit in a GaAs quantum dot array. Optimization of readout fidelity enables a single-shot measurement time of 16 μs on average, with adaptive initialization and efficient qubit frequency estimation based on rea...

[Kwon, Y. and Prof. H. Jeong] Quantum Metrological Power of Continuous-Variable Quantum Networks May 9, 2022 l Hit 653

We investigate the quantum metrological power of typical continuous-variable (CV) quantum networks. Particularly, we show that most CV quantum networks provide an entanglement to quantum states in distant nodes that enables one to achieve the Heisenberg scaling in the number of modes for distributed quantum displacemen...

[Changjun Lee, Junwoo Kim, Prof. Keehoon Kang and Prof. Takhee Lee] Photo-Responsive Molecular Junct... Apr 18, 2022 l Hit 1019

Realizing photo-switchable molecular junction and improving their performance has been a major research topic in the field of molecular electronics. Here, we implemented photo-responsive molecular junctions by replacing the top electrode of conventional large-area molecular devices with photo-active organic halide pero...

[Ju-Yeon Gyhm] Quantum Charging Advantage Cannot Be Extensive Without Global Operations Apr 13, 2022 l Hit 994

Quantum batteries are devices made from quantum states, which store and release energy in a fast and efficient manner, thus offering numerous possibilities in future technological applications. They offer a significant charging speedup when compared to classical batteries, due to the possibility of using entangling cha...

[Quantum Gas Lab.] Universal Early Coarsening of Quenched Bose Gases Apr 7, 2022 l Hit 737

We investigate the early coarsening dynamics of an atomic Bose gas quenched into a superfluid phase. Using a two-step quench protocol, we independently control the two cooling rates during and after passing through the critical region, respectively, and measure the number of quantum vortices spontaneously created in th...

[Jaeyoung Kim, Kyungjune, Prof. Keehoon Kang, and Prof. Takhee Lee] Channel-Length-Modulated Avalanc... Apr 6, 2022 l Hit 547

Recently there has been growing interest in avalanche multiplication in two-dimensional (2D) materials and device applications such as avalanche photodetectors and transistors. Previous studies have mainly utilized unipolar semiconductors as the active material and focused on developing high-performance ...