Zobrazeno 1 - 10
of 504
pro vyhledávání: '"Powell, Stephen"'
Autor:
Pal, Sukla, Powell, Stephen
Publikováno v:
Phys. Rev. B 109, 094427 (2024)
We investigate quench dynamics of spin ice after removal of a strong magnetic field along the [100] crystal direction, using Monte Carlo simulations and theoretical arguments. We show how the early-time relaxation of the magnetization can be understo
Externí odkaz:
http://arxiv.org/abs/2310.12410
Autor:
Wilkins, Neil, Powell, Stephen
Publikováno v:
Phys. Rev. E 107, 054126 (2023)
We derive a field theory for the two-dimensional classical dimer model by applying bosonization to Lieb's (fermionic) transfer-matrix solution. Our constructive approach gives results that are consistent with the well-known height theory, previously
Externí odkaz:
http://arxiv.org/abs/2301.09665
Autor:
Powell, Stephen
Publikováno v:
Phys. Rev. B 105, 064413 (2022)
Dimer models arise as effective descriptions in a variety of physical contexts, and provide paradigmatic examples of systems subject to strong local constraints. Here we present a quantum version of the venerable Kasteleyn model, which has an unusual
Externí odkaz:
http://arxiv.org/abs/2111.14428
Autor:
Wilkins, Neil, Powell, Stephen
Publikováno v:
Phys. Rev. E 104, 014145 (2021)
We solve the classical square-lattice dimer model with periodic boundaries and in the presence of a field $\boldsymbol{t}$ that couples to the (vector) flux, by diagonalizing a modified version of Lieb's transfer matrix. After deriving the torus part
Externí odkaz:
http://arxiv.org/abs/2103.03260
Autor:
Wilkins, Neil, Powell, Stephen
Publikováno v:
Phys. Rev. B 102, 174431 (2020)
We study phases and transitions of the square-lattice double dimer model, consisting of two coupled replicas of the classical dimer model. As on the cubic lattice, we find a thermal phase transition from the Coulomb phase, a disordered but correlated
Externí odkaz:
http://arxiv.org/abs/2007.14409
Autor:
Grist, James T., Withey, Stephanie, Bennett, Christopher, Rose, Heather E. L., MacPherson, Lesley, Oates, Adam, Powell, Stephen, Novak, Jan, Abernethy, Laurence, Pizer, Barry, Bailey, Simon, Clifford, Steven C., Mitra, Dipayan, Arvanitis, Theodoros N., Auer, Dorothee P., Avula, Shivaram, Grundy, Richard, Peet, Andrew C
Background Brain tumours represent the highest cause of mortality in the paediatric oncological population. Diagnosis is commonly performed with magnetic resonance imaging and spectroscopy. Survival biomarkers are challenging to identify due to the r
Externí odkaz:
http://arxiv.org/abs/2004.09849
Autor:
Grist, James T., Withey, Stephanie, MacPherson, Lesley, Oates, Adam, Powell, Stephen, Novak, Jan, Abernethy, Laurence, Pizer, Barry, Grundy, Richard, Bailey, Simon, Mitra, Dipayan, Arvanitis, Theodoros N., Auer, Dorothee P., Avula, Shivaram, Peet, Andrew C
The imaging and subsequent accurate diagnosis of paediatric brain tumours presents a radiological challenge, with magnetic resonance imaging playing a key role in providing tumour specific imaging information. Diffusion weighted and perfusion imaging
Externí odkaz:
http://arxiv.org/abs/1910.09247
Autor:
Conner, Kenneth R. *, Jones, Courtney M. *, Wood, Nancy *, Aldalur, Aileen *, Paracha, Mariam, Powell, Stephen J., Nie, Yunbo, Dillon, Kevin M. *, Rotoli, Jason *
Publikováno v:
In Journal of Emergency Medicine September 2023 65(3):e163-e171
Autor:
Wilkins, Neil, Powell, Stephen
Publikováno v:
Phys. Rev. B 99, 144403 (2019)
We study the classical cubic-lattice double dimer model, consisting of two coupled replicas of the close-packed dimer model, using a combination of theoretical arguments and Monte Carlo simulations. Our results establish the presence of a 'synchroniz
Externí odkaz:
http://arxiv.org/abs/1812.05632