46 citations · 119 across the 8 of their papers we have counts for
8 papers
Quantum criticality in spin chains with non-ohmic dissipation
Iver Bakken Sperstad, Einar B. Stiansen, Asle Sudbø
We investigate the critical behavior of a spin chain coupled to bosonic baths characterized by a spectral density proportional to , with . Varying changes the effecti…
Quantum criticality in a dissipative (2+1)-dimensional XY model of circulating currents in high-Tc cuprates
Iver Bakken Sperstad, Einar B. Stiansen, Asle Sudbø
We present large-scale Monte Carlo results for the dynamical critical exponent z and the spatio-temporal two-point correlation function of a (2+1)-dimensional quantum XY model with…
Criticality of compact and noncompact quantum dissipative models in dimensions
Einar B. Stiansen, Iver Bakken Sperstad, Asle Sudbø
Using large-scale Monte Carlo computations, we study two versions of a -symmetric model with Ohmic bond dissipation. In one of these versions, the variables are restr…
Monte Carlo simulations of dissipative quantum Ising models
Iver B. Sperstad, Einar B. Stiansen, Asle Sudbo
The dynamical critical exponent is a fundamental quantity in characterizing quantum criticality, and it is well known that the presence of dissipation in a quantum model has si…
Quantum transport in ballistic -wave superconductors with interband coupling: conductance spectra, Josephson current, and crossed Andreev reflection
Iver Bakken Sperstad, Jacob Linder, Asle Sudbø
We study quantum transport in ballistic -wave superconductors where coupling between the two bands is included, and apply our model to three possible probes for detecting th…
0- phase shifts in Josephson junctions as a signature for the -wave pairing state
Jacob Linder, Iver B. Sperstad, Asle Sudbø
We investigate Josephson junctions with superconducting ferropnictides, both in the diffusive and ballistic limit. We focus on the proposed -wave state, and find that the re…