Frustrated spin systems

Group Association:

• Quantum Optics Theory

Description of Activities:

Ultracold gases in optical lattices are versatile tools to simulate strongly-correlated systems. Among these, particularly important are frustrated antiferromagnets, because of their relevance to high-temperature superconductivity and the fundamental understanding of matter. We study the properties of such models and propose how to realize them experimentally. The low-temperature physics of these systems shows a very rich interplay between semiclassically-ordered and exotic disordered phases, such as valence-bond solids or spin liquids, which may harbor fractional excitations with possible applications in quantum information processing.

People in this Project:

• Dr. Miguel Ángel García March

Publications associated to this project

• Orbital order of spinless fermions near an optical Feshbach resonance P. Hauke, E. Zhao, K. Goyal, I. H. Deutsch, W. V. Liu, M. Lewenstein Phys. Rev. A 84, 051603(R) (2011)
• Modified spin-wave theory with ordering vector optimization: spatially anisotropic triangular lattice and J1J2J3 model with Heisenberg interactions P. Hauke, T. Roscilde, V. Murg, J. I. Cirac, R. Schmied New J. Phys. 13, 075017 (2011)
• Quantum simulation of frustrated classical magnetism in triangular optical lattices J. Struck, C. Ölschläger, R. Le Targat, P. Soltan-Panahi, A. Eckardt, M. Lewenstein,
  P. Windpassinger, K. Sengstock Science 333, 996-999 (2011)
• Optical lattices: Orbital dance M. Lewenstein, W. V. Liu Nature Phys. 7, 101–103 (2011)
• Modified spin-wave theory with ordering vector optimization: frustrated bosons on the spatially anisotropic triangular lattice P. Hauke, T. Roscilde, V. Murg, J. I. Cirac, R. Schmied New J. Phys. 12, 053036 (2010)
• Frustrated quantum antiferromagnetism with ultracold bosons in a triangular lattice A. Eckardt, P. Hauke, P. Soltan-Panahi, C. Becker, K. Sengstock, M. Lewenstein Europhys. Lett. 89, 10010 (2010)
• Bose-Hubbard phase diagram with arbitrary integer filling N. Teichmann, D. Hinrichs, M. Holthaus, A. Eckardt Phys. Rev. B 79, 100503(R) (2009)
• Frustration, area law, and interference in quantum spin models A. Sen(De), U. Sen, J. Dziarmaga, A. Sanpera, M. Lewenstein Phys. Rev. Lett. 101, 187202 (2008)
• Atomic and molecular physics: polar molecules in topological order M. Lewenstein Nature Physics 2, 289-354 (2006)
• Quantum gases in trimerized kagomé lattices B. Damski, H. Fehrmann, H.U. Everts, M. Baranov, L. Santos, M. Lewenstein Phys. Rev. A 72, 053612 (2005)
• Atomic fermi gas in the trimerized kagomé lattice at 2/3 filling B. Damski, H.-U. Everts, A. Honecker, H. Fehrmann, L. Santos, M. Lewenstein Phys. Rev. Lett. 95, 060403 (2005)
• Atomic quantum gases in Kagomé lattices L. Santos, M.A. Baranov, J.I. Cirac, H.-U. Everts, H. Fehrmann, M. Lewenstein Phys. Rev. Lett. 93, 030601 (2004)