Quantum Dissipative Dynamics of Entanglement in the Spin-Boson Model (2006)
Lim, Jong Soo, Choi, Mahn-Soo, Choi, M. Y.
We study quantum dissipative dynamics of entanglement in the spin-boson model, described by the generalized master equation. We consider the two opposite limits of pure-dephasing and relaxation...
Andreev Bound States in the Kondo Quantum Dots Coupled to Superconducting Leads (2006)
We have studied the Kondo quantum dot coupled to two superconducting leads and investigated the subgap Andreev states using the NRG method. Contrary to the recent NCA results [Clerk and Ambegaokar,...
Kondo Effects in Carbon Nanotubes: From SU(4) to SU(2) symmetry (2006)
Lim, Jong Soo, Choi, Mahn-Soo, Choi, M. Y., Lopez, Rosa, Aguado, Ramon
We study the Kondo effect in a single-electron transistor device realized in a single-wall carbon nanotube. The K-K' double orbital degeneracy of a nanotube, which originates from the peculiar...
Defect Motion and Lattice Pinning Barrier in Josephson-Junction Ladders (2005)
Kang, H., Lim, Jong Soo, Choi, J., Choi, M. Y.
We study motion of domain wall defects in a fully frustrated Josephson-unction ladder system, driven by small applied currents. For small system sizes, the energy barrier E_B to the defect motion is...
Critical currents for vortex defect motion in superconducting arrays (2005)
Lim, Jong Soo, Choi, M. Y., Kim, Beom Jun, Choi, J.
We study numerically the motion of vortices in two-dimensional arrays of resistively shunted Josephson junctions. An extra vortex is created in the ground states by introducing novel boundary...
Phase Transitions in Models for Coupled Charge-Density Waves (2004)
Lee, Minchul, Kim, Eun-Ah, Lim, Jong Soo, Choi, M. Y.
Various phase transitions in models for coupled charge-density waves are investigated by means of the $\epsilon$-expansion, mean-field theory, and Monte Carlo simulations. At zero temperature the...
Frequency resonance in Josephson-junction arrays under strong driving (2003)
Lim, Jong Soo, Choi, M. Y., Kim, Beom Jun
We study resonance behavior of a two-dimensional fully frustrated Josephson-junction array driven by high alternating currents. The signal-to-noise ratio (SNR) is examined as the frequency of the...
Dynamic transition and resonance in current-driven arrays of Josephson junctions (2002)
Jeon, Gun Sang, Lim, Jong Soo, Kim, Hyun Jin, Choi, M. Y.
We consider a two-dimensional fully frustrated Josephson-junction array, which is driven uniformly by oscillating currents. As the temperature is lowered, there emerges a dynamic phase transition to...