94 citations · 603 across the 23 of their papers we have counts for
23 papers
Estimating Entanglement Entropy via Variational Quantum Circuits with Classical Neural Networks
Sangyun Lee, Hyukjoon Kwon, Jae Sung Lee
Entropy plays a crucial role in both physics and information science, encompassing classical and quantum domains. In this work, we present the Quantum Neural Entropy Estimator (QNE…
Ubiquitous Spin Freezing in the Superconducting State of UTe2
Shyam Sundar, N. Azari, M. Goeks +17
In most superconductors electrons form Cooper pairs in a spin-singlet state mediated by either phonons or by long-range interactions such as spin fluctuations. The superconductor U…
Multidimensional entropic bound: Estimator of entropy production for general Langevin dynamics with an arbitrary time-dependent protocol
Sangyun Lee, Dong-Kyum Kim, Jong-Min Park +3
Entropy production (EP) is a key quantity in thermodynamics, and yet measuring EP has remained a challenging task. Here we introduce an EP estimator, called multidimensional entrop…
Speed limit for a highly irreversible process and tight finite-time Landauer's bound
Jae Sung Lee, Sangyun Lee, Hyukjoon Kwon +1
Landauer's bound is the minimum thermodynamic cost for erasing one bit of information. As this bound is achievable only for quasistatic processes, finite-time operation incurs addi…
Estimating entropy production in a stochastic system with odd-parity variables
Dong-Kyum Kim, Sangyun Lee, Hawoong Jeong
Entropy production (EP) is a central measure in nonequilibrium thermodynamics, as it can quantify the irreversibility of a process as well as its energy dissipation in special case…
Witnessing quantum criticality and entanglement in the triangular antiferromagnet KYbSe
A. O. Scheie, E. A. Ghioldi, J. Xing +20
The Heisenberg triangular lattice quantum spin liquid and the phase transitions to nearby magnetic orders have received much theoretical attention, but clear experimental manifesta…
Signatures of a Majorana-Fermi surface in the Kitaev magnet AgLiIrO
Joshuah T. Heath, Faranak Bahrami, Sangyun Lee +4
Detecting Majorana fermions in experimental realizations of the Kitaev honeycomb model is often complicated by non-trivial interactions inherent to potential spin liquid candidates…
Evidence of shallow bandgap in ultra-thin 1T'-MoTe2 via infrared spectroscopy
Jin Cheol Park, Eilho Jung, Sangyun Lee +2
Although van der Waals (vdW) layered MoS2 shows the phase transformation from the semiconducting 2H-phase to the metallic 1T-phase through chemical lithium intercalation, vdW MoTe2…
Inertial effects on the Brownian gyrator
Youngkyoung Bae, Sangyun Lee, Juin Kim +1
The recent interest into the Brownian gyrator has been confined chiefly to the analysis of Brownian dynamics both in theory and experiment despite the applicability of general case…
Quantumness and thermodynamic uncertainty relation of finite-time Otto cycle
Sangyun Lee, Meesoon Ha, Hawoong Jeong
To reveal the role of the quantumness in the Otto cycle and to discuss the validity of the thermodynamic uncertainty relation (TUR) in the cycle, we study the quantum Otto cycle an…
Learning entropy production via neural networks
Dong-Kyum Kim, Youngkyoung Bae, Sangyun Lee +1
This Letter presents a neural estimator for entropy production, or NEEP, that estimates entropy production (EP) from trajectories of relevant variables without detailed information…
Finite-time quantum Otto engine: Surpassing the quasi-static efficiency due to friction
Sangyun Lee, Meesoon Ha, Jong-Min Park +1
In finite-time quantum heat engines, some work is consumed to drive a working fluid accompanying coherence, which is called `friction'. To understand the role of friction in quantu…
Quantum mechanical bound for efficiency of quantum Otto heat engine
Jong-Min Park, Sangyun Lee, Hyun-Myung Chun +1
The second law of thermodynamics constrains that the efficiency of heat engines, classical or quantum, cannot be greater than the universal Carnot efficiency. We discover another b…
Non-equilibrium driven by an external torque in the presence of a magnetic field
Sangyun Lee, Chulan Kwon
We investigate a motion of a colloid in a harmonic trap driven out of equilibrium by an external non-conservative force producing a torque in the presence of a uniform magnetic fie…
A peak in the critical current for quantum critical superconductors
Soon-Gil Jung, Soonbeom Seo, Sangyun Lee +3
Generally, studies of the critical current Ic are necessary if superconductors are to be of practical use because Ic sets the current limit below which there is a zero-resistance s…
Generalized image deconvolution by exploiting spatially variant point spread functions
SangYun Lee, Kyeoreh Lee, Seungwoo Shin +1
An optical imaging system forms an object image by recollecting light scattered by the object. However, intact optical information of the object delivered through the imaging syste…
The effects of spatiotemporal coherence on interferometric imaging
Seungwoo Shin, Kyoohyun Kim, KyeoReh Lee +2
Illumination coherence plays a major role in various imaging systems, from microscopy, metrology, digital holography, optical coherence tomography, to ultrasound imaging. Here, we…
Optical diffraction tomography techniques for the study of cell pathophysiology
Kyoohyun Kim, Jonghee Yoon, Seungwoo Shin +3
Three-dimensional imaging of biological cells is crucial for the investigation of cell biology, provide valuable information to reveal the mechanisms behind pathophysiology of cell…
Pressure dependence of upper critical fields in FeSe single crystals
Ji-Hoon Kang, Soon-Gil Jung, Sangyun Lee +5
We investigate the pressure dependence of the upper critical fields (μ) for FeSe single crystals with pressure up to 2.57 GPa. The superconducting (SC) properties sho…
Enhanced critical current density in the pressure-induced magnetic state of the high-temperature superconductor FeSe
Soon-Gil Jung, Ji-Hoon Kang, Eunsung Park +5
We investigate the relation of the critical current density (Jc) and the remarkably increased superconducting transition temperature (Tc) for the FeSe single crystals under pressur…
Alterations in cell surface area and deformability of individual human red blood cells in stored blood
HyunJoo Park, Misook Ji, SangYun Lee +4
The functionality and viability of stored human red blood cells (RBCs) is an important clinical issue in transfusion. To systematically investigate changes in stored whole blood, t…
3-D refractive index tomograms and deformability of individual human red blood cells from cord blood of newborn infants and maternal blood
HyunJoo Park, Taegyu Ahnb, Kyoohyun Kim +6
Red blood cells (RBCs) from the cord blood of newborn infants have distinctive functions for fetal and infant development. To systematically investigate the biophysical characteris…
Quantitative Morphological and Biochemical Studies on Human Downy Hairs using 3-D Quantitative Phase Imaging
SangYun Lee, Kyoohyun Kim, Yuhyun Lee +6
This study presents the morphological and biochemical findings on human downy arm hairs using 3-D quantitative phase imaging techniques. 3-D refractive index tomograms and high-res…