120 citations · 1.5k across the 42 of their papers we have counts for
34 papers · 1 filter
Exact Nagaoka-to-spiral transition in the doped infinite-U triangular lattice
Yang Zhang, Cristian D. Batista
We study the single-hole infinite- Hubbard model on the triangular lattice with nearest- and next-nearest-neighbor hoppings and . A frustrating destabilizes Nag…
Novel magnetic orderings in the kagome Kondo-lattice model
Kipton Barros, Jörn W. F. Venderbos, Gia-Wei Chern +1
We consider the Kondo-lattice model on the kagome lattice and study its weak-coupling instabilities at band filling fractions for which the Fermi surface has singularities. These s…
Quantum phase diagram of the triangular-lattice antiferromagnet BaCoSbO
G. Koutroulakis, T. Zhou, C. D. Batista +4
The magnetic phases of the ideal spin-1/2 triangular-lattice antiferromagnet BaCoSbO are identified and studied using Ba nuclear magnetic resonance (NMR) sp…
Magnetic Field Induced Transition in Vanadium Spinels
E. D. Mun, Gia-Wei Chern, V. Pardo +5
We study vanadium spinels VO ( = Cd, Mg) in pulsed magnetic fields up to 65 T. A jump in magnetization at 40 T is observed in the single-crystal MgV$_…
Formation of Magnetic Microphases in CaCoO
Y. Kamiya, C. D. Batista
We study a frustrated quantum Ising model relevant for CaCoO that consists of a triangular lattice of weakly-coupled ferromagnetic (FM) chains. According to our quantum…
Condensation of Anyons in Frustrated Quantum Magnets
Cristian D. Batista, Rolando D. Somma
We derive the exact ground space of a family of spin-1/2 Heisenberg chains with uniaxial exchange anisotropy (XXZ) and interactions between nearest and next-nearest-neighbor spins.…
Probing the Interplay between Quantum Charge Fluctuations and Magnetic Ordering in LuFe2O4
J. Lee, S. A. Trugman, C. D. Batista +7
Ferroelectric and ferromagnetic materials possess spontaneous electric and magnetic order, respectively, which can be switched by the corresponding applied electric and magnetic fi…
Multiferroic behavior in trimerized Mott insulators
Y. Kamiya, C. D. Batista
We demonstrate multiferroic behavior in trimerized Mott insulators through interplay between spins and electric dipole moments resulting from electronic charge fluctuations in frus…
Dimensional crossover in the quasi-two-dimensional Ising-O(3) model
Y. Kamiya, N. Kawashima, C. D. Batista
We present results of our Monte Carlo simulation of the Ising-O(3) model on the two-dimensional (2D) and quasi-2D lattices. This model is an effective classical model for the stack…
Crossover Behavior from Decoupled Criticality
Yoshitomo Kamiya, Naoki Kawashima, C. D. Batista
We study the thermodynamic phase transition of a spin Hamiltonian comprising two 3D magnetic sublattices. Each sublattice contains XY spins coupled by the usual bilinear exchange,…
The Canted Spiral: An Exact Ground State of XXZ Zigzag Ladders
C. D. Batista
We derive the exact ground states for a one dimensional family of XXZ Hamiltonians on the zigzag ladder. These states exhibit true long range spiral order that spontaneousl…
Emergent Symmetry and Dimensional Reduction at a Quantum Critical Point
J. Schmalian, C. D. Batista
We show that the spatial dimensionality of the quantum critical point associated with Bose--Einstein condensation at T=0 is reduced when the underlying lattice comprises a set of l…
Magnetic Excitations in the Spin-1 Anisotropic Heisenberg Antiferromagnetic Chain System NiCl-4SC(NH)
S. A. Zvyagin, J. Wosnitza, C. D. Batista +7
NiCl-4SC(NH) (DTN) is a quantum S=1 chain system with strong easy-pane anisotropy and a new candidate for the Bose-Einstein condensation of the spin degrees of freedom.…
Phase diagram and spin Hamiltonian of weakly-coupled anisotropic S=1/2 chains in CuCl2*2((CD3)2SO)
Y. Chen, M. B. Stone, M. Kenzelmann +3
Field-dependent specific heat and neutron scattering measurements were used to explore the antiferromagnetic S=1/2 chain compound CuCl2 * 2((CD3)2SO). At zero field the system acqu…
Geometric Frustration and Dimensional Reduction at a Quantum Critical Point
C. D. Batista, J. Schmalian, N. Kawashima +5
We show that the spatial dimensionality of the quantum critical point associated with Bose--Einstein condensation at T=0 is reduced when the underlying lattice comprises a set of l…
Role of anisotropy in the spin-dimer compound BaCuSi2O6
Suchitra E. Sebastian, P. Tanedo, P. A. Goddard +9
We present results of magnetisation and electron paramagnetic resonance experiments on the spin-dimer system BaCuSi2O6. Evidence indicates that the origin of anisotropic terms in t…
High-dimensional fractionalization and spinon deconfinement in pyrochlore antiferromagnets
Z. Nussinov, C. D. Batista, B. Normand +1
The ground states of Klein type spin models on the pyrochlore and checkerboard lattice are spanned by the set of singlet dimer coverings, and thus possess an extensive ground--stat…
Phonon Thermal Transport of URu2Si2: Broken Translational Symmetry and Strong-Coupling of the Hidden Order to the Lattice
P. A. Sharma, N. Harrison, M. Jaime +5
A dramatic increase in the total thermal conductivity (k) is observed in the Hidden Order (HO) state of single crystal URu2Si2. Through measurements of the thermal Hall conductivit…
The S=1/2 chain in a staggered field: High-energy bound-spinon state and the effects of a discrete lattice
M. Kenzelmann, C. D. Batista, Y. Chen +4
We report an experimental and theoretical study of the antiferromagnetic S=1/2 chain subject to uniform and staggered fields. Using inelastic neutron scattering, we observe a novel…
Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6
S. E. Sebastian, P. A. Sharma, M. Jaime +6
We report an experimental determination of the phase boundary between a quantum paramagnetic state and the proposed spin Bose-Einstein condensate of triplons in the spin gap compou…
Intermediate Coupling Theory of Electronic Ferroelectricity
C. D. Batista, J. E. Gubernatis, J. Bonča +1
We calculate the quantum phase diagram of an extended Falicov-Kimball model for one and two-dimensional systems in the intermediate coupling regime. Even though some features of th…
Itinerant Ferromagnetism in the Periodic Anderson Model
C. D. Batista, J. Bonča, J. E. Gubernatis
We introduce a novel mechanism for itinerant ferromagnetism, based on a simple two-band model. The model includes an uncorrelated and dispersive band hybridized with a second band…
Hidden unity in the quantum description of matter
G. Ortiz, C. D. Batista
We introduce an algebraic framework for interacting quantum systems that enables studying complex phenomena, characterized by the coexistence and competition of various broken symm…
Unveiling Order behind Complexity: Coexistence of Ferromagnetism and Bose-Einstein Condensation
C. D. Batista, G. Ortiz, J. E. Gubernatis
We present an algebraic framework for identifying the order parameter and the possible phases of quantum systems that is based on identifying the local dimension of the quantum…