We study a chiral spin liquid wave function defined as a Gutzwiller projected BCS state with a complex pairing function. After projection, spontaneous dimerization is found for any odd but finite number of chains, thus satisfying the Lieb-Schultz-Mattis theorem, whereas for an even number of chains there is no dimerization. The two-dimensional thermodynamic limit is consistently reached for a large number of chains since the dimer order parameter vanishes in this limit. This property clearly supports the possibility of a spin liquid ground state in two dimensions with a gap to all physical excitations and with no broken translation symmetry.
|Titolo:||Chiral spin liquid wave function and the Lieb-Schultz-Mattis theorem|
|Autori:||Sorella S; Capriotti L; Becca F; Parola A|
|Rivista:||PHYSICAL REVIEW LETTERS|
|Data di pubblicazione:||2003|
|Digital Object Identifier (DOI):||10.1103/PhysRevLett.91.257005|
|Appare nelle tipologie:||1.1 Journal article|