Berlin 2008 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 38: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...

TT 38.2: Vortrag

Freitag, 29. Februar 2008, 10:30–10:45, H 3010

Noise correlation for fermions with attractive interactions confined in one-dimensional optical lattices — •Farshid Karim Pour¹, Stefan Wessel¹, Marcos Rigol², and Alejandro Muramatsu¹ — ¹Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany. — ²Department of Physics, University of California, Santa Cruz, 1156 High Street Santa Cruz, CA 95064, USA

Using quantum Monte Carlo simulations, we study the behavior of the one-dimensional attractive fermionic Hubbard model in different confinement potentials. Studying the noise correlation function we show that the signals for charge-density wave and superconductivity can clearly be seen in the noise correlation function for such fermionic systems. We show that density-density and pairing correlation functions are characterized by the anomalous dimension K_ρ of a corresponding periodic system. This allows us to determine conditions for a supersolid state inside a trap. We find that, eventhough the SU(2) symmetry is broken by the confining potential, density-desity and pairing correlations can decay with exactly the same exponent, hence giving rise to a (quasi-)supersolid in 1D[1].

[1] F. Karim Pour, M. Rigol, S. Wessel, A. Muramatsu, PRB 75, 161104(R) (2007)