We use the density matrix renormalization group to study the quantum
transitions that occur in the half-filled one-dimensional fermionic Hubbard
model with onsite potential disorder. We find a transition from the gapped
Mott phase with algebraic spin correlations to a gapless spin-disordered phase
beyond a critical strength of the disorder 1 c ss U= 2. Both the transitions in
the charge and spin sectors are shown to be coincident. We also establish the
finite-size corrections to the charge gap and the spin-spin correlation length
in the presence of disorder and using a finite-size-scaling analysis we obtain
the zero temperature phase diagram of the various quantum phase transitions
that occur in the disorder-interaction plane.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa.de:bsz:ch1-199801405 |
| Date | 30 October 1998 |
| Creators | Pai, R. V., Punnoose, A., Römer, R. A. |
| Contributors | TU Chemnitz, SFB 393 |
| Publisher | Universitätsbibliothek Chemnitz |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | doc-type:preprint |
| Format | application/pdf, application/postscript, text/plain, application/zip |
Page generated in 0.0021 seconds