title: Spin ladders and quantum simulators for Tomonaga-Luttinger liquids.
abstract: Magnetic insulators have proven to be usable as quantum simulators for itinerant interacting quantum systems. In particular the compound (C(5)H(12)N)(2)CuBr(4) (for short: (Hpip)(2)CuBr(4)) was shown to be a remarkable realization of a Tomonaga-Luttinger liquid (TLL) and allowed us to quantitatively test the TLL theory. Substitution weakly disorders this class of compounds and thus allows us to use them to tackle questions pertaining to the effect of disorder in TLL as well, such as that of the formation of the Bose glass. In this paper we present, as a first step in this direction, a study of the properties of the related (Hpip)(2)CuCl(4) compound. We determine the exchange couplings and compute the temperature and magnetic field dependence of the specific heat, using a finite temperature density matrix renormalization group procedure. Comparison with the measured specific heat at zero magnetic field confirms the exchange parameters and Hamiltonian for the (Hpip)(2)CuCl(4) compound, giving the basis needed to begin studying the disorder effects.
authors.affiliation: Laboratory for Neutron Scattering, Paul Scherrer Institut, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Ward
authors.forename: P
authors.initials: P
authors.lastname: Bouillot
authors.forename: H
authors.initials: H
authors.lastname: Ryll
authors.forename: K
authors.initials: K
authors.lastname: Kiefer
authors.forename: K W
authors.initials: KW
authors.lastname: Krämer
authors.forename: Ch
authors.initials: Ch
authors.lastname: Rüegg
authors.forename: C
authors.initials: C
authors.lastname: Kollath
authors.forename: T
authors.initials: T
authors.lastname: Giamarchi
mesh_terms: D003198:Computer Simulation; D008956:Models, Chemical; D008958:Models, Molecular; D011789:Quantum Theory; D012996:Solutions / Q000737:chemistry*; D013113:Spin Labels
chemical_list: D012996:Solutions; D013113:Spin Labels