Evidence for a floating phase of the transverse ANNNI model at high frustration

We study the transverse quantum ANNNI model in the region of high frustration (k>0.5) using the DMRG algorithm. We obtain a precise determination of the phase diagram, showing clear evidence for the existence of a floating phase, separated from the paramagnetic modulated phase by a high-order critical line ending at the multicritical point. We obtain simple and accurate formulae for the two critical lines.

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- Phys.Rept. 170 213

Density matrix renormalization group study of the disorder line in the quantum annni model

Matteo Beccaria
(
- Salento U. and
- INFN, Lecce
)
,
Massimo Campostrini
(
- INFN, Pisa and
- Pisa U.
)
,
Alessandra Feo
(
- Parma U. and
- INFN, Parma
)

- Phys.Rev.B 73 (2006) 052402
•
e-Print:
- cond-mat/0511658
•
DOI:
- 10.1103/PhysRevB.73.052402

- J.Phys.A 14 L251

- Z.Phys.B 83 273

- Z.Phys.B 88 333

- Phys.Rev.B 66 064413

- Phys.Rev.E 75 021105

- J.Phys.Soc.Jap. 75 114001

e-Print:
- cond-mat/0605411

The density-matrix renormalization group

U. Schollwock
(
- RWTH Aachen U.
)

- Rev.Mod.Phys. 77 (2005) 259-315
•
e-Print:
- cond-mat/0409292
•
DOI:
- 10.1103/RevModPhys.77.259

e-Print:
- cond-mat/0505027

- Z.Phys.B 43 241