Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Einar B. Stiansen"'
Publikováno v:
Physical Review B85, 224531 (2012)
We have performed large-scale Monte Carlo simulations on a model describing a (2+1)-dimensional array of dissipative Josephson junctions. We find three distinct stable quantum phases of the system. The most ordered state features long-range spatial o
Externí odkaz:
http://arxiv.org/abs/1206.2928
We have performed large-scale Monte Carlo simulations on a model describing a (2+1)-dimensional array of dissipative Josephson junctions. We find three distinct stable quantum phases of the system. The most ordered state features long-range spatial o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a04c657238d2aa6d1ea1ec94ea2a3294
We investigate the critical behavior of a spin chain coupled to bosonic baths characterized by a spectral density proportional to $\omega^s$, with $s>1$. Varying $s$ changes the effective dimension $d_\text{eff} = d + z$ of the system, where $z$ is t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74e7c911648222abfb7fedd5ac720eaf
Publikováno v:
Physical Review B. 84
This thesis presents seven research papers on topics in condensed-matter theory. Five of the papers report on Monte Carlo studies of quantum phase transitions in various (d+1)-dimensional statistical mechanics models featuring Caldeira-Leggettlike di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b44bdcc9f4db67ef1971b4ed8c4cc95
https://doi.org/10.1103/physrevb.84.180503
https://doi.org/10.1103/physrevb.84.180503
Publikováno v:
Physical Review B. 83
Using large-scale Monte Carlo computations, we study two versions of a (1 + 1)D Z(4)-symmetric model with ohmic bond dissipation. In one of these versions, the variables are restricted to the inter ...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23c6c08157d6a6c9bfe1698fa4634eaa
https://doi.org/10.1103/physrevb.83.115134
https://doi.org/10.1103/physrevb.83.115134
The dynamical critical exponent $z$ is a fundamental quantity in characterizing quantum criticality, and it is well known that the presence of dissipation in a quantum model has significant impact on the value of $z$. Studying quantum Ising spin mode
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c1c9cd770eb48bb64278cb1758d1c85
http://arxiv.org/abs/1002.3369
http://arxiv.org/abs/1002.3369
Publikováno v:
Physical Review B. 79
We have performed large-scale Monte Carlo simulations on a two-dimensional generalized Ashkin-Teller model to calculate the thermodynamic properties in the critical region near its transitions. The Ashkin-Teller model has a pair of Ising spins at eac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65838767440f0d7ee5f45956951be167
https://doi.org/10.1103/physrevb.79.094506
https://doi.org/10.1103/physrevb.79.094506