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Quantum spin chains with site dissipation
Philipp Werner, Matthias Troyer, Subir Sachdev
We use Monte Carlo simulations to study chains of Ising- and XY-spins with dissipation coupling to the site variables. The phase diagram and critical exponents of the dissipative I…
Thermal melting of density waves on the square lattice
Adrian Del Maestro, Subir Sachdev
We present the theory of the effect of thermal fluctuations on commensurate "p x p" density wave ordering on the square lattice (p >= 3, integer). For the case in which this order…
Quantum phase transitions out of the heavy Fermi liquid
T. Senthil, Subir Sachdev, Matthias Vojta
We review recent work on the instability of the heavy Fermi liquid state (FL) of the Kondo lattice towards a magnetic metal in which the local moments are not part of the Fermi sea…
Low temperature broken symmetry phases of spiral antiferromagnets
Luca Capriotti, Subir Sachdev
We study Heisenberg antiferromagnets with nearest- (J1) and third- (J3) neighbor exchange on the square lattice. In the limit of large spin S, there is a zero temperature (T) Lifsh…
Competing orders II: the doped quantum dimer model
Leon Balents, Lorenz Bartosch, Anton Burkov +2
We study the phases of doped spin S=1/2 quantum antiferromagnets on the square lattice, as they evolve from paramagnetic Mott insulators with valence bond solid (VBS) order at zero…
Phenomenological lattice model for dynamic spin and charge fluctuations in the cuprates
Matthias Vojta, Subir Sachdev
Motivated by recent neutron scattering experiments on the cuprate superconductors, we present a phenomenological framework describing the dynamics of collective spin excitations co…