Now showing items 1-20 of 155

• #### Absence of Disorder-Driven Metal-Insulator Transitions in Simple Holographic Models ﻿

(American Physical Society (APS), 2015)
We study electrical transport in a strongly coupled strange metal in two spatial dimensions at finite temperature and charge density, holographically dual to the Einstein-Maxwell theory in an asymptotically four-dimensional ...
• #### Algebraic Charge Liquids ﻿

(Nature Publishing Group, 2008)
High temperature superconductivity emerges in the cuprate compounds upon changing the electron density of an insulator in which the electron spins are antiferromagnetically ordered. A key characteristic of the superconductor ...
• #### Angular Fluctuations of a Multicomponent Order Describe the Pseudogap of $YBa_2Cu_3O_{6+x}$ ﻿

(American Association for the Advancement of Science (AAAS), 2014)
The hole-doped cuprate high-temperature superconductors enter the pseudogap regime as their superconducting critical temperature, $T_c$, falls with decreasing hole density. Recent x-ray scattering experiments in ...
• #### Antiferromagnetism in Metals: From the Cuprate Superconductors to the Heavy Fermion Materials ﻿

(IOP Publishing, 2012)
The critical theory of the onset of antiferromagnetism in metals, with concomitant Fermi surface reconstruction, has recently been shown to be strongly coupled in two spatial dimensions. The onset of unconventional ...
• #### Atomic-scale electronic structure of the cuprate d-symmetry form factor density wave state ﻿

(Nature Publishing Group, 2015)
Research on high-temperature superconducting cuprates is at present focused on identifying the relationship between the classic ‘pseudogap’ phenomenon and the more recently investigated density wave state. This state is ...
• #### Auxiliary-boson and DMFT studies of bond ordering instabilities of t-J-V models on the square lattice ﻿

(Springer Science + Business Media, 2014)
We examine the influence of strong on-site Coulomb interactions on instabilities of the metallic state on the square lattice to general forms of bond order. The Mott correlations are accounted for by the auxiliary-boson ...
• #### Black Hole Determinants and Quasinormal Modes ﻿

(Institute of Physics, 2010)
We derive an expression for functional determinants in thermal spacetimes as a product over the corresponding quasinormal modes. As simple applications we give efficient computations of scalar determinants in thermal AdS, ...
• #### Bond Order in Two-Dimensional Metals with Antiferromagnetic Exchange Interactions ﻿

(American Physical Society (APS), 2013)
We present an unrestricted Hartree-Fock computation of charge-ordering instabilities of two-dimensional metals with antiferromagnetic exchange interactions, allowing for arbitrary ordering wave vectors and internal wave ...
• #### Breakdown of Fermi Liquid Behavior at the (π,π)=2k$_F$ Spin-Density Wave Quantum-Critical Point: the Case of Electron-Doped Cuprates ﻿

(American Physical Society, 2012)
Many correlated materials display a quantum-critical point between a paramagnetic and a spin-density wave (SDW) state. The SDW wave vector connects points, so-called hot spots, on opposite sides of the Fermi surface. The ...
• #### Collective Cyclotron Motion of the Relativistic Plasma in Graphene ﻿

(American Physical Society, 2008)
We present a theory of the finite temperature thermoelectric response functions of graphene in the hydrodynamic regime where electron-electron collisions dominate the scattering. In moderate magnetic fields, the Dirac ...
• #### Competing orders in a magnetic field: Spin and charge order in the cuprate superconductors ﻿

(American Physical Society (APS), 2002)
We describe two-dimensional quantum spin fluctuations in a superconducting Abrikosov flux lattice induced by a magnetic field applied to a doped Mott insulator. Complete numerical solutions of a self-consistent large- N ...
• #### Competing orders in thermally fluctuating superconductors in two dimensions ﻿

(American Physical Society (APS), 2004)
We extend recent low-temperature analyses of competing orders in the cuprate superconductors to the pseudogap regime where all orders are fluctuating. A universal continuum limit of a classical Ginzburg-Landau functional ...
• #### Competition Between Spin Density Wave Order and Superconductivity in the Underdoped Cuprates ﻿

(American Physical Society, 2009)
We describe the interplay between $d$-wave superconductivity and spin density wave (SDW) order in a theory of the hole-doped cuprates at hole densities below optimal doping. The theory assumes local SDW order, and ...
• #### Competition between Superconductivity and Nematic Order: Anisotropy of Superconducting Coherence Length ﻿

(American Physical Society, 2012)
We study the interplay between nematic order and superconductivity, motivated by a recent experiment on FeSe observing strongly distorted vortex shapes [Song et al. Science 332 1410 (2011)]. We show that the nematic order ...
• #### Compressible Quantum Phases from Conformal Field Theories in 2+1 Dimensions ﻿

(American Physical Society, 2012)
Conformal field theories (CFTs) with a globally conserved U(1) charge Q can be deformed into compressible phases by modifying their Hamiltonian, H, by a chemical potential H→H-μQ. We study 2+1 dimensional CFTs upon which ...
• #### Conductivity of weakly disordered strange metals: From conformal to hyperscaling-violating regimes ﻿

(Elsevier BV, 2015)
We present a semi-analytic method for constructing holographic black holes that interpolate from anti-de Sitter space to hyperscaling-violating geometries. These are holographic duals of conformal field theories in the ...
• #### Confinement transition to density wave order in metallic doped spin liquids ﻿

(American Physical Society (APS), 2016)
Insulating quantum spin liquids can undergo a confinement transition to a valence bond solid via the condensation of topological excitations of the associated gauge theory. We extend the theory of such transitions to ...
• #### Conformal field theories at nonzero temperature: Operator product expansions, Monte Carlo, and holography ﻿

(American Physical Society (APS), 2014)
We compute the nonzero temperature conductivity of conserved flavor currents in conformal field theories (CFTs) in 2+1 space-time dimensions. At frequencies much greater than the temperature, ℏω≫kBT, the ω dependence can ...
• #### Conformal field theories in a periodic potential: Results from holography and field theory ﻿

(American Physical Society (APS), 2014)
We study (2+1)-dimensional conformal field theories (CFTs) with a globally conserved U(1) charge, placed in a chemical potential which is periodically modulated along the spatial direction x with zero average: μ(x)=V cos(kx). ...