We characterize the Mott insulator and Luther-Emery phases of the 1D Hubbard model through correlators that measure the parity of spin and charge strings along the chain. These non-local quantities order in the corresponding gapped phases and vanish at the critical point $U_{c}=0$, thus configuring as hidden order parameters. The Mott insulator consists of bound doublon-holon pairs, which in the Luther-Emery phase turn into electron pairs with opposite spins, both unbinding at $U_{c}$. The behavior of the parity correlators is captured by an effective free spinless fermion model.
Non-local order parameters for the 1D Hubbard model / Montorsi, Arianna; Roncaglia, M.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 109:(2012), pp. 236404-1-236-404-5. [10.1103/PhysRevLett.109.236404]
Non-local order parameters for the 1D Hubbard model
MONTORSI, Arianna;
2012
Abstract
We characterize the Mott insulator and Luther-Emery phases of the 1D Hubbard model through correlators that measure the parity of spin and charge strings along the chain. These non-local quantities order in the corresponding gapped phases and vanish at the critical point $U_{c}=0$, thus configuring as hidden order parameters. The Mott insulator consists of bound doublon-holon pairs, which in the Luther-Emery phase turn into electron pairs with opposite spins, both unbinding at $U_{c}$. The behavior of the parity correlators is captured by an effective free spinless fermion model.Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11583/2503599
Attenzione
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo