A5087432541- Quantum and electron transport phenomena
- Semiconductor Quantum Structures and Devices
- Quantum Computing Algorithms and Architecture
- Quantum chaos and dynamical systems
- Quantum Mechanics and Non-Hermitian Physics
- Molecular Junctions and Nanostructures
- Advanced Physical and Chemical Molecular Interactions
- Topological Materials and Phenomena
- Advanced Fiber Laser Technologies
- Electron and X-Ray Spectroscopy Techniques
- Advanced Memory and Neural Computing
- Graphene research and applications
- Quantum Information and Cryptography
- Nonlinear Photonic Systems
- Surface and Thin Film Phenomena
- Matrix Theory and Algorithms
- Mechanical and Optical Resonators
- Quantum-Dot Cellular Automata
- Non-Destructive Testing Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Advancements in Photolithography Techniques
Samsung (South Korea)
2021-2025
Korea Advanced Institute of Science and Technology
2011-2020
PT-symmetric optical resonators combine absorbing regions with active, amplifying regions. The latter are the source of radiation generated via spontaneous and stimulated emission, which embodies quantum noise can result in lasing. We calculate frequency-resolved output intensity such systems relate it to a suitable measure excess mode nonorthogonality. lineshape differs depending on whether emission lines isolated (as for weakly amplifying, almost hermitian systems) or overlapping...
Quantum entanglement between an impurity spin and electrons nearby is a key property of the single-channel Kondo effects. We show that can be detected by measuring electron conductance through double quantum dot in orbital regime. derive relation conductance, when SU(2) symmetry regime weakly broken. The reflects universal form many-body states near fixed point. Using it, spatial distribution entanglement, hence, cloud, detected, with breaking spatially nonuniformly electrical means.
We predict that an anisotropic charge Kondo effect appears in a triple quantum dot, when the system has two-fold degenerate ground states of (1,1,0) and (0,0,1) configurations. Using bosonization refermionization methods, we find at low temperature, two different phases massive fluctuations between configurations vanishing fluctuations, which are equivalent with Kondo-screened ferromagnetic model, respectively. The phase transition is identifiable by electron conductance measurement,...
This work demonstrates that electron pairing can be achieved purely by the Coulomb interactions in a triple quantum dot. Such mechanism is different from of Cooper pair. The two dots dot mediated other (third) dot, when third strongly couples with via repulsion. By measuring conductance through each individual authors find degeneracy for pairing, condition degeneracy, and nontrivial transport behavior pairing. These findings may exploited to design devices correlations functionalities.
We theoretically study charge Kondo effects in a quadruple quantum dot. This system has been realized carbon nanotube [Nature (London) 535, 395 (2016)] by A. Hamo et al., while it can be also formed two-dimensional electron gas (2DEG). The is particular situation where dot twofold degenerate ground states of $({n}_{\text{A}}=1,{n}_{\text{B}}=1,{n}_{\text{C}}=1,{n}_{\text{D}}=0)$ and (0,0,0,1) configurations, ${n}_{\ensuremath{\lambda}}$ the occupation number individual...
We predict a new type of the negative-$U$ Anderson impurity formed in triple quantum dot. The two dots system behave as preferring zero or double electron occupancy rather than single occupancy, and third dot stabilizes attractive interaction $U < 0$ via Coulomb repulsion. Using bosonization method, we find that has different phases massive vanishing charge fluctuations between occupancies at low temperature, which are equivalent with antiferromagnetic ferromagnetic anisotropic Kondo...
A small angle x-ray scattering simulator has been developed for metrology and inspection applications based on the first Born approximation considering non-ideal equipment-related factors. The shows good reproducibility in various device structures measurement environments, including slit-configurations incident angles. In addition, a Q-space adaptive weighting method is proposed to enhance about 300% accuracy, especially non-single repeated pitch such as VNAND with complex diffraction patterns.