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8 papers · 2 filters
Spin Ice, Fractionalization and Topological Order
C. Castelnovo, R. Moessner, S. L. Sondhi
The spin ice compounds {\dys} and {\holm} are highly unusual magnets which epitomize a set of concepts of great interest in modern condensed matter physics: their low-energy physic…
A field trip through spin ice
G. Sala, C. Castelnovo, R. Moessner +5
Fractionalisation -- the breaking up of an apparently indivisible microscopic degree of freedom -- is one of the most counterintuitive phenomena in many-body physics. Here we study…
Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URuSi
P. G. Niklowitz, S. R. Dunsiger, C. Pfleiderer +6
We report low-energy inelastic neutron scattering data of the paramagnetic (PM) to hidden-order (HO) phase transition at in URuSi. While confirming prev…
Local Quantum Criticality of an Iron-Pnictide Tetrahedron
T. Tzen Ong, Piers Coleman
Motivated by the close correlation between transition temperature () and the tetrahedral bond angle of the As-Fe-As layer observed in the iron-based superconductors, we study…
A theory of Topological Kondo Insulators
Maxim Dzero, Kai Sun, Piers Coleman +1
We examine how the properties of the Kondo insulators change when the symmetry of the underlying crystal field multiplets is taken into account. We employ the Anderson lattice mode…
Topological Quantum Glassiness
Claudio Castelnovo, Claudio Chamon
Quantum tunneling often allows pathways to relaxation past energy barriers which are otherwise hard to overcome classically at low temperatures. However, this is not always the cas…
Debye-Hückel theory for spin ice at low temperature
Claudio Castelnovo, Roderich Moessner, Shivaji Sondhi
At low temperatures, spin ice is populated by a finite density of magnetic monopoles-pointlike topological defects with a mutual magnetic Coulomb interaction. We discuss the proper…
Quantum Criticality without Tuning in the Mixed Valence Compound beta-YbAlB4
Yosuke Matsumoto, Satoru Nakatsuji, Kentaro Kuga +6
Fermi liquid theory, the standard theory of metals, has been challenged by a number of observations of anomalous metallic behavior found in the vicinity of a quantum phase transiti…