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The New Iron Age
(Nature Publishing Group, 2008)
The discovery of a new class of high-temperature superconductors based on iron tests the limits of current theoretical and computational tools for the understanding of strongly correlated systems.
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 ...
Fluctuating Spin Density Waves in Metals
(American Physical Society, 2009)
Recent work has used a U(1) gauge theory to describe the physics of Fermi pockets in the presence of fluctuating spin density wave order. We generalize this theory to an arbitrary band structure and ordering wavevector. ...
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 ...
A Square Lattice Algebraic Spin Liquid with SO(5) Symmetry
(American Physical Society, 2008)
We propose a critical spin liquid ground state for S=1/2 antiferromagnets on the square lattice. In a renormalization group analysis of the “staggered flux“ algebraic spin liquid, we examine perturbations, present in the ...
Ising and Spin orders in Iron-Based Superconductors
(American Physical Society, 2008)
Motivated by recent neutron scattering experiments, we study the ordering of spins in the iron-based superconductors La(O\(_{1-x}\)F\(_x\))FeAs, assuming them in proximity to a Mott insulator in the phase diagram. The ...
Global Phase Diagrams of Frustrated Quantum Antiferromagnets in Two Dimensions: Doubled Chern-Simons Theory
(The American Physical Society, 2009)
We present a general approach to understanding the quantum phases and phase transitions of quantum antiferromagnets in two spatial dimensions. We begin with the simplest spin liquid state, the \(Z_2\) spin liquid, whose ...
Experimental Observables Near a Nematic Quantum Critical Point in the Pnictide and Cuprate Superconductors
(American Physical Society, 2008)
The newly discovered high temperature superconductor SmFeAs(\(O_{1-x}F_x\)) shows a clear nematic transition where the square lattice of Fe ions has a rectangular distortion. Similar nematic ordering has also been observed ...