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9 papers · 2 filters
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…
Mott insulator to superfluid transition in the Bose-Hubbard model: a strong-coupling approach
K. Sengupta, N. Dupuis
We present a strong-coupling expansion of the Bose-Hubbard model which describes both the superfluid and the Mott phases of ultracold bosonic atoms in an optical lattice. By perfor…
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…
Collective fields in the functional renormalization group for fermions, Ward identities, and the exact solution of the Tomonaga-Luttinger model
Florian Schuetz, Lorenz Bartosch, Peter Kopietz
We develop a new formulation of the functional renormalization group (RG) for interacting fermions. Our approach unifies the purely fermionic formulation based on the Grassmannian…