Density matrix renormalization group study of ultrasmall superconducting grains

Authors
Dukelsky, J Sierra, G
Citation
J. Dukelsky et G. Sierra, Density matrix renormalization group study of ultrasmall superconducting grains, PHYS REV L, 83(1), 1999, pp. 172-175
Citations number
16
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
1
Year of publication
1999
Pages
172 - 175
Database
ISI
SICI code
0031-9007(19990705)83:1<172:DMRGSO>2.0.ZU;2-Q
Abstract
We apply the density matrix renormalization group (DMRG) method to the BCS pairing Hamiltonian which describes ultrasmall superconducting grains. Our version of the DMRG uses the particle (hole) states around the Fermi level as the system block (environment). We observed a smooth logarithmic-like cr ossover between the few electron regime and the BCS-bulk regime.