Seminars and Lectures

Since March 2020, the Theory of Quantum Matter Unit has hosted regular online seminars and occasional online lecture series. Attendance of these seminars from outside OIST is welcome: for Zoom links, please contact the TQM Unit.

FY2022

Dr. Rico Pohle
The University of Tokyo, Japan

Jan 17 : Spin nematic, dimensional reduction, and chiral spin liquid in the spin-1 Kitaev-Heisenberg model with biquadratic interactions

	Prof. Bumjoon Kim Pohang University of Science and Technology, Korea Oct 26 : Evidence for a hidden order in the pyrochlore iridate Nd2Ir2O7
	Prof. Frank Pollmann Technical University of Munich, Germany Oct 25 : Exploring Quantum Phases of Matter on Quantum Processors
	Dr. Francis Pratt STFC UKRI, UK Oct 11: Probing triangular-lattice quantum spin liquids with LF-µSR
	Dr. Andreas Thomasen QunaSys, Japan Oct 4 : Contemporary approaches to variational quantum algorithms for quantum chemistry
	Mr. Hyeok-Jun Yang Korea Advanced Institute of Science and Technology, Korea Sep 21: Searching for hidden phases born of a quantum spin liquid
	Dr. Han Yan Rice University, USA Aug 17: Classification of classical spin liquid in the large-S limit
	Dr. Ryutaro Okuma University of Oxford, UK Aug 2: Itinerant frustration in van der Waals coupled iodides
	Dr. Leenoy Meshulam University of Washington, USA July 12: On spins and neurons: investigating brain function with Ising models and renormalization group inspired approaches (Joint seminar with Theoretical Sciences Visiting Program, OIST).
	Dr. Kirill Povarov ETH Zurich, Switzerland July 5: Probing spinons by Electron Spin Resonance: hidden interactions in a spin chain
	Prof. Jun Won Rhim Ajou University, Korea Jun 28: Quantum distance and flat band
	Prof. Andreas Läuchli Paul Scherrer Institute / EPFL, Switzerland Jun 14: Diagnosing weakly first-order phase transitions by coupling to order parameters
	Prof. Ian Affleck The University of British Columbia, Canada Jun 7: The Majorana-Hubbard Model
	Mr. Benedikt Schneider Ludwig Maximilian University of Munich, Germany May 24: Projective symmetry group classification of chiral Z_2 spin liquids on the pyrochlore lattice: Application to the XXZ model
	Mr. Atsushi Ueda University of Tokyo, Japan May 17: Tensor network renormalization study on the crossover in classical Heisenberg and RP2 models in two dimensions
	Prof. Natalia Perkins School of Physics and Astronomy, University of Minnesota, USA May 10: Disorder in the Kitaev spin liquid
	Mr. Hong Yang The University of Tokyo, Japan April 20:Duality, Criticality, Anomaly, and Topology in Quantum Spin-1 Chains
	Prof. Hiroshi Kontani Nagoya University, Japan April 19:Exotic QLC states in Fe-based superconductors, kagome metals, and twisted bilayer graphene

FY2021

	Prof. Michael Berry University of Bristol, UK March 22:Variations on a theme of Aharonov and Bohm
	Prof. Robert Joynt University of Wisconsin-Madison, USA March 08:Evanescent-wave Johnson Noise
	Prof. Bumjoon Kim Pohang University of Science and Technology, Korea March 01:Intertwinned Néel and spin nematic orders in a square-lattice antiferromagnet
	Dr. Han Yan Rice University, USA January 25: Low Energy Structure of Spiral Spin Liquid
	Associate Prof. Yusuke Nambu Tohoku University, Japan January 19: Topological transition by vector spin chirality on a triangular lattice
	Prof. Daniel Khomskii Universitaet zu Koeln, Germany December 15: Clusters and orbitals in transition metal compound
	Prof. Claudio Castelnovo University of Cambridge, UK November 30: Localisation phenomena in frustrated magnets
	Dr. Allen Scheie Oak Ridge National Laboratory, USA November 16: Quantum spin entanglement and criticality in 2D triangular magnet KYbSe₂
	Prof. Yong-Baek Kim University of Toronto, Canada November 9: Realizations of Fractonic Quantum Phases and Quantum Spin Liquids
	Dr. Daniel Bulmash University of Maryland, USA October 26: Anomalies in (2+1)D Symmetry-Enriched Topological Phases
	Dr. Chen-Hsuan Hsu RIKEN, Japan October 12: Universal transport features in spin-orbit-coupled quantum wires
	Prof. Amalia Coldea University of Oxford, UK September 30: Exploring competing electronic phases under extreme conditions in superconducting FeSe1-xSx
	Prof. Alan Tennant Oak Ridge National Laboratory, USA September 02: Witnessing entanglement in magnets using neutrons
	Dr. Rina Tazai Department of Physics, Nagoya University, Japan July 15: Theory of multipole fluctuations mediated superconductivity and charge-loop current phase
	Assistant Prof. Yutaka Akagi The University of Tokyo, Japan July 01: T opological Magnons from “nematicity” (Joint seminar with Motome Group, University of Tokyo).
	Prof. Snir Gazit The Hebrew University of Jerusalem, Israel June 24: Quantum phase transitions between orthogonal and normal fermions in metals and semi-metals
	Prof. Gianluca Stefanucci University of Rome Tor Vergatah, Italy June 17: Coherent versus incoherent excitons: Stability, time-dependent ARPES spectrum and Floquet topological phases (Joint seminar with Femtosecond Spectroscopy Unit, OIST)
	Prof. Andrey Zheludev Laboratory for Solid State Physics, ETH Zürich, Switzerland June 10 : Ferroelectricity in novel frustrated quantum magnets
	Prof. Nigel Hussey University of Bristol, UK / Radboud University, Netherlands June 3 : Two charge sectors in the strange metal regime of overdoped cuprates
	Prof. Michael Lawler Cornell University, USA May 20 : Topological frustration in a quantum spin ladder

FY2020

	Prof. Martin Mourigal Georgia Institute of Technology, USA March 31 : Hybridization and interaction between quantum multipolar fluctuations in a conventional magnet
	Prof. Oleg Tchernyshyov Johns Hopkins University, USA March 25 : Quantum statistics of magnetic vortice
	Dr. Lucy Clark University of Birmingham, UK March 3 : Exploring a New Family of S = ½ Kagomé Antiferromagnets
	Prof. Momoi Tsutomu RIKEN, Japan February 24 : Coupled Trimer Description of Kagome Compound Volborthite
	Prof. Chisa Hotta University of Tokyo, Japan February 17 : Designing topological antiferro-magnons
	Prof. Gil Refael California Institute of Technology, USA February 10 : Floquet higher-order topological insulators: principles and path towards realizations (Joint seminar with Femtosecond Spectroscopy Unit, OIST).
	Dr. Luís Seabra InnoWave Technologies, Portugal February 03 : From Frustrated Magnets to Computer Vision
	Dr. Luka Trifunovic University of Zürich, Switzerland January 20 : N-band Hopf insulator
	Dr. Owen Benton MPI-PKS Dresden, Germany December 09 : Exactly solvable spin-1/2 models with highly-degenerate, partially ordered, ground states
	Prof. James Annett HH Wills Physics Laboratory, University of Bristol, UK December 2 : 30 years of Philip Anderson's RVB theory of high Tc superconductivity in cuprates: is it still relevant today?
	Prof. Johannes Reuther Freie Universitaet Berlin, Germany November 11 : Classical spiral spin liquids as a possible route to quantum spin liquids
	Mr. Katsuhiro Tanaka University of Tokyo, Japan October 28 : A new twist on spin nematics/quadrupoles
	Dr. Kazushi Aoyama Osaka University, Japan October 21 : Spin current as a probe of KT-type topological transitions in magnets
	Prof. Pan Zhang Institute of Theoretical Physics, Chinese Academy of Sciences, China October 14 : Solving Statistical Mechanics: From Mean Field to Neural Networks, then to Tensor Networks
	Prof. Masafumi Udagawa Gakushuin University, Japan October 7 : Spectral singularity of spinons in quantum spin ice
	Prof. Yasir Iqbal Indian Institute of Technology Madras, Chennai, India September 30 : “Completing the square” in frustrated magnets
	Prof. Jeffrey G. Rau University of Windsor, Canada September 24 : Spontaneous magnon decay and non-Hermitian topology
	Dr. Tetsuo Hanaguri RIKEN Center for Emergent Matter Science, Japan September 16 : Exotic superconducting states in FeSe-based materials investigated by spectroscopic-imaging scanning tunneling microscop
	Dr. Daigorou Hirai Institute for Solid State Physics, University of Tokyo, Japan September 1 : Multipolar orders in spin-orbit entangled 5d Mott insulator
	Prof. Harald O. Jeschke Okayama University, Japan August 24 : Search for spin liquids in three-dimensional materials
	Dr. Yoshihiko Okamoto Nagoya University, Japan August 18 : Magnetic and Volumetric Properties of Breathing Pyrochlore Magnet
	Dr. Estelle Inack Perimeter Institute for Theoretical Physics, Canada July 28 : Variational neural simulations and annealing
	Dr. Ke Liu Ludwig Maximilian University of Munich, Germany July 21 : Revealing the Phase Diagram of Kitaev Materials by Machine Learning: Cooperation and Competition between Spin Liquids
	Prof. Paolo Radaelli University of Oxford, UK July 3 : Room-temperature Half-skyrmions and Bimerons in an antiferromagnetic insulator via the Kibble-Zurek mechanism
	Prof. Roger Melko Perimeter Institute for Theoretical Physics, Canada June 30 : Unbiased estimators using generative neural samplers
	Prof. Kedar Damle Tata Institute of Fundamental Research, India June 22 : Purely dipolar dimers in two dimensions
	Mr. Nat Tantivasadakarn Harvard University, USA June 16 : Searching for fracton orders via symmetry defect condensation
	Prof. Roger Melko Perimeter Institute for Theoretical Physics, Canada June 8 : Machine Learning the Quantum Many Body Problem
	Dr. Paul McClarty MPI-PKS, Germany May 18 : Topological Magnons
	Dr. Michael Pretko University of Colorado Boulder, USA May 13 : Fractons: A New Type of Particle
	Prof. Karlo Penc Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungary April 13, 20 and 27 : Short Lecture Series - SU(3) symmetric spin models

FY2019

Dr. Grigory Bednik - University of California Santa Cruz, USA
March 26 : Hopfions in 3D dimer models