743 citations · 3k across the 37 of their papers we have counts for
38 papers
From dimensional reduction to tetramerization in mixed ferro-antiferro breathing pyrochlores
Sourin Chatterjee, Kelvin Salou-Smith, Benedikt Schneider +8
We study the spin-1/2 nearest-neighbor Heisenberg model on the breathing pyrochlore lattice in the mixed ferro-antiferromagnetic regime, where one tetrahedral sublattice is antifer…
Finite-Size Spectral Signatures of Order by Quantum Disorder: A Perspective from Anderson's Tower of States
Subhankar Khatua, Griffin C. Howson, Michel J. P. Gingras +1
In frustrated magnetic systems with a subextensive number of classical ground states, quantum zero-point fluctuations can select a unique long-range ordered state, a celebrated phe…
Anharmonic Collective Oscillations in Isotropic Spin Systems and their Spectroscopic Signatures
Anna Fancelli, Matías G. Gonzalez, Subhankar Khatua +4
Spin waves are the fundamental excitations in magnetically ordered spin systems and are ubiquitously observed in magnetic materials. However, the standard understanding of spin wav…
Universal temperature-dependent power law excitation gaps in frustrated quantum spin systems harboring order-by-disorder
Alexander Hickey, Jeffrey G. Rau, Subhankar Khatua +1
When magnetic moments are subject to competing or frustrated interactions, continuous degeneracies that are not protected by any symmetry of the parent Hamiltonian can emerge at th…
Synthesis and characterization of the novel breathing pyrochlore compound Ba3Tm2Zn5O11
Lalit Yadav, Rabindranath Bag, Ramesh Dhakal +10
In this study, a novel material from the rare-earth based breathing pyrochlore family, Ba3Tm2Zn5O11, was successfully synthesized. Powder x-ray diffraction and high-resolution powd…
Ground state properties of the Heisenberg-compass model on the square lattice
Subhankar Khatua, Griffin C. Howson, Michel J. P. Gingras +1
Compass models provide insights into the properties of Mott-insulating materials that host bond-dependent anisotropic interactions between their pseudospin degrees of freedom. In t…
Landau Theory of Altermagnetism
Paul A. McClarty, Jeffrey G. Rau
We formulate a Landau theory for altermagnets, a class of colinear compensated magnets with spin-split bands. Starting from the non-relativistic limit, this Landau theory goes beyo…
Pseudo-Goldstone modes and dynamical gap generation from order-by-thermal-disorder
Subhankar Khatua, Michel J. P. Gingras, Jeffrey G. Rau
Accidental ground state degeneracies -- those not a consequence of global symmetries of the Hamiltonian -- are inevitably lifted by fluctuations, often leading to long-range order,…
Thermal Conductivity of Square Ice
Ruairidh Sutcliffe, Jeffrey G. Rau
We investigate thermal transport in square ice, a two-dimensional analogue of spin ice, exploring the role played by emergent magnetic monopoles in transporting energy. Using kinet…
Towards understanding the magnetic properties of the breathing pyrochlore compound Ba3Yb2Zn5O11: A single crystal study
Sachith Dissanayake, Zhenzhong Shi, Jeffrey G. Rau +10
Ba3Yb2Zn5O11 is unique among breathing pyrochlore compounds for being in the nearly decoupled limit where inter-tetrahedron interactions are weak, hosting isolated clusters or "mol…
Magnetoelectric generation of a Majorana-Fermi surface in Kitaev's honeycomb model
Rajas Chari, Roderich Moessner, Jeffrey G. Rau
We study the effects of static magnetic and electric fields on Kitaev's honeycomb model. Using the electric polarization operator appropriate for Kitaev materials, we derive the ef…
Unravelling competing microscopic interactions at a phase boundary: a single crystal study of the metastable antiferromagnetic pyrochlore YbGeO
C. L. Sarkis, J. G. Rau, L. D. Sanjeewa +10
We report inelastic neutron scattering measurements from our newly synthesized single crystals of the structurally metastable antiferromagnetic pyrochlore YbGeO.…
Multi-phase competition in quantum pyrochlore antiferromagnet CdYbSe: zero and applied magnetic field study
K. Guratinder, Jeffrey G. Rau, V. Tsurkan +9
We study magnetic behaviour of the Yb ions on a frustrated pyrochlore lattice in the spinel {\CYS}. The crystal-electric field parameters deduced from high-energy inelastic…
Non-Hermitian topology of spontaneous magnon decay
Paul A. McClarty, Jeffrey G. Rau
Spontaneous magnon decay is a generic feature of the magnetic excitations of anisotropic magnets and isotropic magnets with non-collinear order. In this paper, we argue that the ef…
Magnon interactions in the frustrated pyrochlore ferromagnet YbTiO
Jeffrey G. Rau, Roderich Moessner, Paul A. McClarty
The frustrated rare-earth pyrochlore YbTiO is remarkable among magnetic materials: despite a ferromagnetically ordered ground state it exhibits a broad, nearly gapless,…
Behavior of the breathing pyrochlore lattice BaYbZnO in applied magnetic field
J. G. Rau, L. S. Wu, A. F. May +9
The breathing pyrochlore lattice material BaYbZnO exists in the nearly decoupled limit, in contrast to most other well-studied breathing pyrochlore compounds. As…
Frustrated quantum rare-earth pyrochlores
Jeffrey G. Rau, Michel J. P. Gingras
In this review we provide an introduction to the physics of a series of frustrated quantum rare-earth pyrochlores. We first give a background on the microscopic single- and two-ion…
Pseudo-Goldstone gaps and order-by-quantum-disorder in frustrated magnets
Jeffrey G. Rau, Paul A. McClarty, Roderich Moessner
In systems with competing interactions, continuous degeneracies can appear which are accidental, in that they are not related to any symmetry of the Hamiltonian. Accordingly, the p…
Frustration and anisotropic exchange in ytterbium magnets with edge-shared octahedra
Jeffrey G. Rau, Michel J. P. Gingras
We consider the structure of anisotropic exchange interactions in ytterbium-based insulating rare-earth magnets built from edge-sharing octahedra. We argue the features of trivalen…
Spin ice thin films: Large-N theory and Monte Carlo simulations
Étienne Lantagne-Hurtubise, Jeffrey G. Rau, Michel J. P. Gingras
We explore the physics of highly frustrated magnets in confined geometries, focusing on the Coulomb phase of pyrochlore spin ices. As a specific example, we investigate thin films…
Magnetic anisotropy of the alkali iridate NaIrO at high magnetic fields: evidence for strong ferromagnetic Kitaev correlations
Sitikantha. D Das, Sarbajaya Kundu, Zengwei Zhu +10
The magnetic field response of the Mott-insulating honeycomb iridate NaIrO is investigated using torque magnetometry measurements in magnetic fields up to 60 tesla. A p…
Fingerprints of quantum spin ice in Raman scattering
Jianlong Fu, Jeffrey G. Rau, Michel J. P. Gingras +1
We develop a theory of the dynamical response of a minimal model of quantum spin ice (QSI) by means of inelastic light scattering. In particular, we are interested in the Raman res…
Spin slush in an extended spin ice model
Jeffrey G. Rau, Michel J. P. Gingras
We introduce a new classical spin liquid on the pyrochlore lattice by extending spin ice with further neighbour interactions. We find that this disorder free spin model exhibits a…
Anisotropic exchange within decoupled tetrahedra in the quantum breathing pyrochlore Ba3Yb2Zn5O11
J. G. Rau, L. S. Wu, A. F. May +9
The low energy spin excitation spectrum of the breathing pyrochlore Ba3Yb2Zn5O11 has been investigated with inelastic neutron scattering. Several nearly resolution limited modes wi…