Now showing items 21-40 of 155

• #### Connecting high-field quantum oscillations to zero-field electron spectral functions in the underdoped cuprates ﻿

(Nature Publishing Group, 2014)
The nature of the pseudogap regime of cuprate superconductors at low hole density remains unresolved. It has a number of seemingly distinct experimental signatures: a suppression of the paramagnetic spin susceptibility at ...
• #### Conserved Current Correlators of Conformal Field Theories in 2+1 Dimensions ﻿

(American Physical Society (APS), 2013)
We compute current correlators of the CPN−1 field theory in 2+1 dimensions, both at the critical point and in the phase with spontaneously broken SU(N) symmetry. Universal constants are obtained to next-to-leading order ...
• #### Cooper pairing in non-Fermi liquids ﻿

(American Physical Society (APS), 2015)
States of matter with a sharp Fermi surface but no well-defined Landau quasiparticles arise in a number of physical systems. Examples include (i) quantum critical points associated with the onset of order in metals; (ii) ...
• #### Correlated Phases of Bosons in Tilted Frustrated Lattices ﻿

(American Physical Society, 2011)
We study the "tilting" of Mott insulators of bosons into metastable states. These are described by Hamiltonians acting on resonant subspaces, and have rich possibilities for correlated phases with non-trivial entanglement ...
• #### DC resistivity at the onset of spin density wave order in two-dimensional metals ﻿

(American Physical Society (APS), 2014)
The theory for the onset of spin density wave order in a metal in two dimensions flows to strong coupling, with strong interactions not only at the “hot spots,” but on the entire Fermi surface. We advocate the computation ...
• #### Deconfined criticality in bilayer graphene ﻿

(American Physical Society (APS), 2014)
We propose that bilayer graphene can provide an experimental realization of deconfined criticality. Current experiments indicate the presence of Néel order in the presence of a moderate magnetic field. The Néel order can ...
• #### Density wave instabilities in a correlated two-dimensional metal ﻿

(American Physical Society (APS), 2014)
Motivated by recent experimental evidence of charge order in the pseudogap phase of cuprates, we perform a variational analysis of spin-singlet density wave ordering in metals with antiferromagnetic interactions on the ...
• #### Density-wave instabilities of fractionalized Fermi liquids ﻿

(American Physical Society (APS), 2014)
Recent experiments in the underdoped regime of the hole-doped cuprates have found evidence for an incommensurate charge density-wave state. We present an analysis of the charge ordering instabilities in a metal with ...
• #### Destruction of Neel Order in the Cuprates by Electron-Doping ﻿

(American Physical Society, 2008)
Motivated by the evidence$^{1, 2, 3, 4, 5, 6}$ in Pr$_{2-x}$Ce$_x$CuO$_{4-y}$ and Nd$_{2-x}$Ce$_x$CuO$_{4-y}$ of a magnetic quantum critical point at which Neel order is destroyed, we study the evolution with ...
• #### Diamagnetism and density-wave order in the pseudogap regime of YBa 2 Cu 3 O 6 + x ﻿

(American Physical Society (APS), 2014)
Clear experimental evidence of charge density-wave correlations competing with superconducting order in YBCO have thrust their relationship with the pseudogap regime into the spotlight. To aid in characterizing the pseudogap ...
• #### Dicke quantum spin glass of atoms and photons ﻿

(American Physical Society, 2011)
Recent studies of strongly interacting atoms and photons in optical cavities have rekindled interest in the Dicke model of atomic qubits coupled to discrete photon cavity modes. We study the multimode Dicke model with ...
• #### Dicke-Model Quantum Spin and Photon Glass in Optical Cavities: Nonequilibrium Theory and Experimental Signatures ﻿

(American Physical Society (APS), 2013)
In the context of ultracold atoms in multimode optical cavities, the appearance of a quantum-critical glass phase of atomic spins has been predicted recently. Due to the long-range nature of the cavity-mediated interactions, ...
• #### Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates ﻿

(Proceedings of the National Academy of Sciences, 2014)
The identity of the fundamental broken symmetry (if any) in the underdoped cuprates is unresolved. However, evidence has been accumulating that this state may be an unconventional density wave. Here we carry out site-specific ...
• #### Dynamics and Transport of the $Z_2$ Spin Liquid: Application to $\kappa-(ET)_2Cu_2(CN)_3$ ﻿

(American Physical Society, 2009)
We describe neutron scattering, NMR relaxation, and thermal transport properties of $Z_2$ spin liquids in two dimensions. Comparison to recent experiments on the spin $S=\frac{1}{2}$ triangular lattice antiferromagnet ...
• #### The Dynamics of Quantum Criticality Revealed by Quantum Monte Carlo and Holography ﻿

(Nature Publishing Group, 2014)
Understanding the dynamics of quantum systems without long-lived excitations (quasiparticles) constitutes an important yet challenging problem. Although numerical techniques can yield results for the dynamics in imaginary ...
• #### Edge and Impurity Response in Two-Dimensional Quantum Antiferromagnets ﻿

(American Physical Society, 2008)
Motivated by recent Monte Carlo simulations of Höglund and Sandvik (arXiv:0808.0408), we study edge response in square lattice quantum antiferromagnets. We use the $O(3)$ nonlinear σ model to compute the decay asymptotics ...
• #### Effective Theory of Fermi Pockets in Fluctuating Antiferromagnets ﻿

(American Physical Society, 2010)
We describe fluctuating two-dimensional metallic antiferromagnets by transforming to a rotating reference frame in which the electron spin polarization is measured by its projections along the local antiferromagnetic order. ...
• #### Electronic quasiparticles in the quantum dimer model: Density matrix renormalization group results ﻿

(American Physical Society (APS), 2016)
We study a recently proposed quantum dimer model for the pseudogap metal state of the cuprates. The model contains bosonic dimers, representing a spin-singlet valence bond between a pair of electrons, and fermionic dimers, ...
• #### Emergent gauge fields and the high-temperature superconductors ﻿

(The Royal Society, 2016)
The quantum entanglement of many states of matter can be represented by electric and magnetic fields, much like those found in Maxwell’s theory. These fields ‘emerge’ from the quantum structure of the many-electron state, ...