Now showing items 1-14 of 14

• #### 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 ...
• #### 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 ...
• #### 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 ...
• #### 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 ...
• #### The Enigma of the Pseudogap Phase of the Cuprate Superconductors ﻿

(2015)
The last few years have seen significant experimental progress in characterizing the copper-based hole-doped high temperature superconductors in the regime of low hole density, p. Quantum oscillations, NMR, X-ray, and STM ...
• #### Feedback of superconducting fluctuations on charge order in the underdoped cuprates ﻿

(American Physical Society (APS), 2014)
Metals interacting via short-range antiferromagnetic fluctuations are unstable to sign-changing superconductivity at low temperatures. For the cuprates, this leading instability leads to the well-known d-wave superconducting ...
• #### Higgs criticality in a two-dimensional metal ﻿

(American Physical Society (APS), 2015)
We analyze a candidate theory for the strange metal near optimal hole doping in the cuprate superconductors. The theory contains a quantum phase transition between metals with large and small Fermi surfaces of spinless ...
• #### Interplay of Broken Symmetries and Quantum Criticality in Correlated Electronic Systems ﻿

(2016-04-28)
This thesis delves into a study of phases of strongly correlated quantum matter confined to two spatial dimensions. The thesis can broadly be divided into three parts. In the first part, comprising of chapters 2 and 3, we ...
• #### Multipoint Correlators of Conformal Field Theories: Implications for Quantum Critical Transport ﻿

(American Physical Society (APS), 2013)
We compute three-point correlators between the stress-energy tensor and the conserved currents of conformal field theories (CFTs) in 2+1 dimensions. We first compute the correlators in the large-flavor-number expansion of ...
• #### Nematic Order in the Vicinity of a Vortex in Superconducting FeSe ﻿

(American Physical Society, 2011)
We present a phenomenological theory of the interplay between nematic order and superconductivity in the vicinity of a vortex induced by an applied magnetic field. Nematic order can be strongly enhanced in the vortex core. ...
• #### The novel metallic states of the cuprates: Topological Fermi liquids and strange metals ﻿

(Oxford University Press (OUP), 2016)
This article is based on a talk by S.S. at the Nambu Memorial Symposium at the University of Chicago. We review ideas on the nature of the metallic states of the hole-doped cuprate high temperature superconductors, with ...
• #### Phase transition beneath the superconducting dome in BaFe2(As1-xPx)2 ﻿

(American Physical Society (APS), 2015)
We present a theory for the large suppression of the superfluid density ρs in BaFe2(As1−xPx)2 in the vicinity of a putative spin-density wave quantum critical point at a P doping, x=xc. We argue that the transition becomes ...
• #### Singularity of the London Penetration Depth at Quantum Critical Points in Superconductors ﻿

(American Physical Society (APS), 2013)
We present a general theory of the singularity in the London penetration depth at symmetry-breaking and topological quantum critical points within a superconducting phase. While the critical exponents and ratios of amplitudes ...
• #### Topological excitations and the dynamic structure factor of spin liquids on the kagome lattice ﻿

(Nature Publishing Group, 2014)
Recent neutron scattering experiments on the spin-1/2 kagome lattice antiferromagnet ZnCu$_3$(OH)$_6$C$_{12}$ (Herbertsmithite) provide the first evidence of fractionalized excitations in a quantum spin liquid state ...