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Phase diagram of generalized fully frustrated XY model in two dimensions
Petter Minnhagen, Beom Jun Kim, Sebastian Bernhardsson +1
It is shown that the phase diagram of the two-dimensional generalized fully-frustrated XY model on a square lattice contains a crossing of the chirality transition and the Kosterli…
Dynamic critical behaviors in two-dimensional Josephson junction arrays with positional disorder
Jaegon Um, Beom Jun Kim, Petter Minnhagen +2
We numerically investigate dynamic critical behaviors of two-dimensional (2D) Josephson-junction arrays with positional disorder in the scheme of the resistively shunted junction d…
Scaling determination of the nonlinear I-V characteristics for 2D superconducting networks
Petter Minnhagen, Beom Jun Kim, A. Gronlund
It is shown from computer simulations that the current-voltage (-) characteristics for the two-dimensional XY model with resistively-shunted Josephson junction dynamics and M…
Direct Evidence of the Discontinuous Character of the Kosterlitz-Thouless Jump
Petter Minnhagen, Beom Jun Kim
It is numerically shown that the discontinuous character of the helicity modulus of the two-dimensional XY model at the Kosterlitz-Thouless (KT) transition can be directly related…
Phase Transitions in the Two-Dimensional Random Gauge XY Model
Petter Holme, Petter Minnhagen, Beom Jun Kim
The two-dimensional random gauge \xy model, where the quenched random variables are magnetic bond angles uniformly distributed within (), is studied vi…
Comment on ``Loss of Superconducting Phase Coherence in YBa_2Cu_3O_7 Films: Vortex-Loop Unbinding and Kosterlitz-Thouless Phenomena''
Kateryna Medvedyeva, Beom Jun Kim, Petter Minnhagen
Recently, Kotzler et al. measured the frequency-dependent conductance for YBa_2Cu_3O_7 and interpreted their results as evidences that the decay of the superfluid density is caused…
Splitting of the superconducting transition in the two weakly coupled 2D XY models
Kateryna Medvedyeva, Beom Jun Kim, Petter Minnhagen
The frequency and temperature T dependent complex conductivity of two weakly coupled 2D XY models subject to the RSJ dynamics is studied through computer simulations. A dou…
Ubiquitous finite-size scaling features in IV characteristics of various dynamic XY models in two dimensions
Kateryna Medvedyeva, Beom Jun Kim, Petter Minnhagen
Two-dimensional (2D) XY model subject to three different types of dynamics, namely Monte Carlo, resistivity shunted junction (RSJ), and relaxational dynamics, is numerically simula…
Spatiotemporal Stochastic Resonance in Fully Frustrated Josephson Ladders
Beom Jun Kim, Mahn-Soo Choi, Petter Minnhagen +3
We consider a Josephson-junction ladder in an external magnetic field with half flux quantum per plaquette. When driven by external currents, periodic in time and staggered in spac…
Anomalous dynamic response in the two-dimensional lattice Coulomb gas model: Effects of pinning
Beom Jun Kim, Petter Minnhagen
It is demonstrated through Monte Carlo simulations that the one component lattice Coulomb gas model in two dimensions under certain conditions display features of an anomalous dyna…
Current-voltage characteristics of the two-dimensional XY model with Monte Carlo dynamics
Beom Jun Kim
Current-voltage characteristics and the linear resistance of the two-dimensional XY model with and without external uniform current driving are studied by Monte Carlo simulations.…
Analysis of current-voltage characteristics of two-dimensional superconductors: finite-size scaling behavior in the vicinity of the Kosterlitz Thouless transition
Kateryna Medvedyeva, Beom Jun Kim, Petter Minnhagen
It has been suggested [Pierson et al., Phys. Rev. B 60, 1309 (1999); Ammirata et al., Physica C 313, 225 (1999)] that for 2D superconductors there exists a phase transition with th…
Finite-temperature resistive transition in the two-dimensional XY gauge glass model
Beom Jun Kim
We investigate numerically the resistive transition in the two-dimensional XY gauge glass model. The resistively-shunted junction dynamics subject to the fluctuating twist boundary…
Dynamic critical exponent of two-, three-, and four-dimensional XY models with relaxational and resistively shunted junction dynamics
Lars Melwyn Jensen, Beom Jun Kim, Petter Minnhagen
The dynamic critical exponent is determined numerically for the -dimensional XY model (, and 4) subject to relaxational dynamics and resistively shunted junction dyn…
Dynamic critical behaviors of three-dimensional XY models related to superconductors/superfluids
Lars Melwyn Jensen, Beom Jun Kim, Petter Minnhagen
The dynamic critical exponent z is determined from numerical simulations for the three-dimensional XY model subject to two types of dynamics, i.e. relaxational dynamics and resisti…
Magnetic-field dependence of dynamical vortex response in two-dimensional Josephson junction arrays and superconducting films
Beom Jun Kim, Petter Minnhagen
The dynamical vortex response of a two-dimensional array of the resistively shunted Josephson junctions in a perpendicular magnetic field is inferred from simulations. It is found…
Critical current from dynamical boundary instability for fully frustrated Josephson junction arrays
Beom Jun Kim, Petter Minnhagen
We investigate numerically the critical current of two-dimensional fully frustrated arrays of resistively shunted Josephson junctions at zero temperature. It is shown that a domino…
Lattice effects on the current-voltage characteristics of superconducting arrays
Mina Yoon, M. Y. Choi, Beom Jun Kim
The lattice effects on the current-voltage characteristics of two-dimensional arrays of resistively shunted Josephson junctions are investigated. The lattice potential energies due…
Vortex Fluctuations in High-Tc Films: Flux Noise Spectrum and Complex Impedance
Orjan Festin, Peter Svedlindh, Beom Jun Kim +3
The flux noise spectrum and complex impedance for a 500 Å thick YBCO film are measured and compared with predictions for two dimensional vortex fluctuations. It is verified that th…
Flux-noise spectra around the Kosterlitz-Thouless transition for two-dimensional superconductors
Beom Jun Kim, Petter Minnhagen
The flux-noise spectra around the Kosterlitz-Thouless transition are obtained from simulations of the two-dimensional resistively shunted junction model. In particular the dependen…
Quantum phase transitions in superconducting arrays under external magnetic fields
Beom Jun Kim, Gun Sang Jeon, M. -S. Choi +1
We study the zero-temperature phase transitions of two-dimensional superconducting arrays with both the self- and the junction capacitances in the presence of external magnetic fie…
Giant Shapiro steps for two-dimensional Josephson-junction arrays with time-dependent Ginzburg-Landau dynamics
Beom Jun Kim, Petter Minnhagen
Two-dimensional Josephson junction arrays at zero temperature are investigated numerically within the resistively shunted junction (RSJ) model and the time-dependent Ginzburg-Landa…
Vortex dynamics for two-dimensional XY models
Beom Jun Kim, Petter Minnhagen, Peter Olsson
Two-dimensional XY models with resistively shunted junction (RSJ) dynamics and time dependent Ginzburg-Landau (TDGL) dynamics are simulated and it is verified that the vortex respo…
Anomalous Relaxation in the XY Gauge Glass
Beom Jun Kim, M. Y. Choi, S. Ryu +1
To study relaxation dynamics of the two-dimensional XY gauge glass, we integrate directly the equations of motion and investigate the energy function. As usual, it decays exponenti…