7 papers · 1 filter
Quantum Monte Carlo simulations of fidelity at magnetic quantum phase transitions
David Schwandt, Fabien Alet, Sylvain Capponi
When a system undergoes a quantum phase transition, the ground-state wave-function shows a change of nature, which can be monitored using the fidelity concept. We introduce two Qua…
Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu(BO) doped with nonmagnetic impurities
S. Capponi, D. Poilblanc, F. Mila
Controlled doping of SrCu(BO), a faithful realization of the Heisenberg spin-1/2 antiferromagnet on the Shastry-Sutherland lattice, with non-magnetic impurities generat…
Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material
Ch. Rüegg, K. Kiefer, B. Thielemann +11
The phase diagram in temperature and magnetic field of the metal-organic, two-leg, spin-ladder compound (C5H12N)2CuBr4 is studied by measurements of the specific heat and the magne…
Effective Theory of Magnetization Plateaux in the Shastry-Sutherland Lattice
A. Abendschein, S. Capponi
We use the non-perturbative Contractor-Renormalization method (CORE) in order to derive an effective model for triplet excitations on the Shastry-Sutherland lattice. For strong eno…
Spin 3/2 fermions with attractive interactions in a one-dimensional optical lattice: phase diagrams, entanglement entropy, and the effect of the trap
G. Roux, S. Capponi, P. Lecheminant +1
We study spin 3/2 fermionic cold atoms with attractive interactions confined in a one-dimensional optical lattice. Using numerical techniques, we determine the phase diagram for a…
Trionic and quartetting phases in one-dimensional multicomponent ultracold fermions
P. Lecheminant, P. Azaria, E. Boulat +3
We investigate the possible formation of a molecular condensate, which might be, for instance, the analogue of the alpha condensate of nuclear physics, in the context of multicompo…