Zobrazeno 1 - 9
of 9
pro vyhledávání: '"R J Bursill"'
Publikováno v:
Acta Physica Polonica A. 91:105-119
The application of real space renormalization group methods to quantum lattice models has become a topic of great interest following the development of the density matrix renormalization group by White. This method has been used to find the ground an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9187b2ecbf8b5027487012fb6bbf78c9
https://doi.org/10.12693/aphyspola.91.105
https://doi.org/10.12693/aphyspola.91.105
Autor:
F Gode, R J Bursill
Publikováno v:
Journal of Physics: Condensed Matter. 7:9765-9774
We adapt White`s (1992, 1993) density matrix renormalization group (DMRG) to the direct study of critical phenomena. We use the DMRG to generate transformations in the space of coupling constants. We postulate that a study of density matrix eigenvalu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c2df1fc4fcc5c4b368d69dc56b1050cf
https://doi.org/10.1088/0953-8984/7/50/011
https://doi.org/10.1088/0953-8984/7/50/011
Autor:
Colin J. Thompson, R J Bursill
Publikováno v:
Journal of Physics A: Mathematical and General. 26:4497-4511
The authors derive a mean-field expression for the Helmholtz free energy of the extended Hubbard model with on-site repulsion and longer range attraction in the atomic limit. The mean-field free energy is exact in the infinite-dimensional and long-ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bbd9b5fe1c507bd29e999ff218c9be5a
https://doi.org/10.1088/0305-4470/26/18/017
https://doi.org/10.1088/0305-4470/26/18/017
Autor:
Colin J. Thompson, R J Bursill
Publikováno v:
Journal of Physics A: Mathematical and General. 26:769-786
The authors show that the variational theory of Bardeen-Cooper-Schreifer (BCS) is exact for the BCS reduced Hamiltonian for attractive pair potentials which satisfy reasonable conditions. Specific forms of the pair potential are used for illustrative
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c0f4c44161928cc9fdacad1e38b5af6
https://doi.org/10.1088/0305-4470/26/4/008
https://doi.org/10.1088/0305-4470/26/4/008
Publikováno v:
ChemInform. 28
The application of real space renormalization group methods to quantum lattice models has become a topic of great interest following the development of the density matrix renormalization group by White. This method has been used to find the ground an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b32d53612cff2297fd69522ad080136
https://doi.org/10.1002/chin.199726297
https://doi.org/10.1002/chin.199726297
Publikováno v:
Non-Perturbative Methods and Lattice QCD.
A 'forward walking' Green's Function Monte Carlo algorithm is used to obtain expectation values for SU(3) lattice Yang-Mills theory in (3+1) dimensions. The ground state energy and Wilson loops are calculated, and the finite-size scaling behaviour is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b660ce39e340bf6deecb9528dc8da3f
https://doi.org/10.1142/9789812811370_0009
https://doi.org/10.1142/9789812811370_0009
A new finite lattice calculation of the low lying bound state energies in the massive Schwinger model is presented, using a Hamiltonian lattice formulation. The results are compared with recent analytic series calculations in the low mass limit, and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16f15b913374e2153637ff215d9c2e45
We apply a recent adaptation of White's density matrix renormalisation group (DMRG) method to a simple quantum spin model, the dimerised $XY$ chain, in order to assess the applicabilty of the DMRG to quantum systems at non-zero temperature. We find t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::64680b47e6c0d26c76d15bc8e3385e12
http://arxiv.org/abs/cond-mat/9609001
http://arxiv.org/abs/cond-mat/9609001
We study the $T=0$ frustrated phase of the $1D$ quantum spin-$\frac 12$ system with nearest-neighbour and next-nearest-neighbour isotropic exchange known as the Majumdar-Ghosh Hamiltonian. We first apply the coupled-cluster method of quantum many-bod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a179f922e809568d7c3845705247fe76
http://arxiv.org/abs/cond-mat/9511044
http://arxiv.org/abs/cond-mat/9511044