Format results
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Quantum Spin Liquids: Life After the Drought
Patrick Lee - Massachusetts Institute of Technology (MIT) - Department of Physics
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Chiral Mott Insulator of Bosons in a Fully Frustrated Bose Hubbard Model
Arun Paramekanti - University of Toronto
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Molecular rotation in doped superfluid clusters
Pierre-Nicholas Roy - University of Waterloo
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Spin liquid and Deconfined Criticality in a Kagome Lattice Bose-Hubbard Model
Roger Melko - University of Waterloo
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Intrinsic, Anomalous Hall Effect in a Chiral Multiband Superconductor
Edward Taylor - McMaster University
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Quantum Spin Liquids: Life After the Drought
Patrick Lee - Massachusetts Institute of Technology (MIT) - Department of Physics
The quantum spin liquid state is a prime example of an emergent phenomenon. Theory predicts that new particles such as spinons and gauge fields may emerge at low temperatures. However, for many years there have not been any examples in nature. The situation has changed in recent years in that a… -
Effective Spin-1/2 Hamiltonians Determined for Er2Ti2O7 & Yb2Ti2O7 Through Inelastic Neutron Scattering
We used time-of-flight inelastic neutron scattering to measure the excitation spectra from field-polarized states of exotic frustrated magnets. A knowledge of these spin-wave excitations in various directions in reciprocal space allows a robust determination of exchange parameters in suitable model… -
Chiral Mott Insulator of Bosons in a Fully Frustrated Bose Hubbard Model
Arun Paramekanti - University of Toronto
Recent experiments have demonstrated that it is possible to create a synthetic magnetic field for neutral atoms in optical lattices using two-photon (Raman) processes. Motivated by exploring the interplay of such artificial magnetic fields and strong correlations for bosons, we have studied the Bose… -
Classical Wigner Crystals on Flat and Curved Surfaces, Topological Defects, `Pleats ‘ and Particle Fractionalization
Paul Chaikin - New York University (NYU)
Charged colloidal particles present a controllable system for study a host of condensed matter/many body problems such as crystallization. 2D crystals are invariably hexagonal. Hexagons perfectly tile a flat plane but a soccer ball requires exactly 12 pentagons dispersed among the hexagons on its… -
Molecular rotation in doped superfluid clusters
Pierre-Nicholas Roy - University of Waterloo
Experiments where impurities were incorporated into helium nanodroplets have shown that the impurity freely rotates, and this has been attributed to the superfluidity of the nanodroplet [1]. Results from experiments with smaller helium clusters suggest that the onset of superfluidity is linked to… -
Spin liquid and Deconfined Criticality in a Kagome Lattice Bose-Hubbard Model
Roger Melko - University of Waterloo
We present large-scale quantum Monte Carlo simulations on a sign-problem free Bose-Hubbard model on the kagome lattice. This model supports a quantum Z2 spin liquid phase with fractional excitations and topological order, which can be characterized definitively through calculation of the topological… -
Intrinsic, Anomalous Hall Effect in a Chiral Multiband Superconductor
Edward Taylor - McMaster University
Chiral superconducting states have attracted an enormous amount of interest in recent years, due both to their intrinsic novelty as well as their potential for quantum information processing. They break both parity and time-reversal sym-metries and have been predicted to harbour Majorana fermions in… -
Far Infrared Study of Magnetic Field Induced Normal States of La1.94Sr0.06CuO4
We report on the ab-plane optical properties of the magnetic field inducednormal state of underdoped La 1.94Sr 0.06CuO 4 ( T c=5.5 K), the first such study. We apply strong magnetic fields (4 T and 16 T) along the c-axis. We find that a 4 T field is strong enough to destroy the superconducting… -
Fractionalized Topological Insulators in Frustrated Magnets
Spin liquid phases in frustrated magnets may arise in a variety of forms. Here we discuss the possibility of topological insulators of spinons or the fractionalized excitations in spin liquids. These phases should be characterized by "both" of the two popular and different definitions of topological…