#### 2020

**“Magnetism and quantum transport in the kagome lattices of semi-metallic Mn 3 X,”**Collin Broholm, Mid-Atlantic virtual APS meeting, December 5, (2020). Website**“Probing Quantum Materials with Neutrons,”**Collin Broholm, Tutorial at the annual meeting of the Japanese Neutron Scattering Society, Virtual meeting, November 9, (2020). Website**“Frustrated Magnetism in Mott Insulating (V 1-x Cr x ) 2 O 3 ,”**Collin Broholm, KITP virtual conference on Correlated Systems with Multicomponent Local Hilbert Spaces, November 5, (2020). Talk**“Magnetism and quantum transport in the kagome lattices of semi-metallic Mn 3 X,”**Collin Broholm, Colloquium, Department of Materials Science and Engineering, California Institute of Technology, September 30, (2020).**“Spooky action at a distance in a solid?”**Collin Broholm, Colloquium, Department of Physics and Astronomy, Johns Hopkins University, September 17, (2020).**“Magnetic structure and excitations in Mn 3 X,”**Collin Broholm, Mn3X workshop, Virtual meeting organized by Argonne National Laboratory, August 19 (2020). Talk**“Towards the experimental realization of a quantum spin liquid,”**Collin Broholm, Munich Conference on Quantum Science and Technology 2020, remote conference presentation, July 6, (2020). Website**“APS Invited Talk: Monopole Superconductivity and Density-Wave Order in Weyl Semi-metals”**, Yi Li, APS March Meeting, Denver (altered to online), March 2020.**“Impact of MACS on Quantum Materials Research,”**Collin Broholm, National Science Foundation Site Visit Review, Center for High Resolution Neutron Scattering (CHRNS), National Institute of Standards and Technology, Remote Site Visit Schedule, March 11, (2020).**“Multipole control of electric and magnetic responses in magnetic Weyl metals,”**Satoru Nakatsuji, APS March Meeting 2020, Denver, March 2-6 2020 (Cancelled due to COVID-19).**“The Quest for a Quantum Spin Liquid,”**Collin Broholm, Colloquium, Department of Physics and Astronomy, Rutgers University, February 26, 2020.**“Weyl Fermions and Topological Spintronics,”**Satoru Nakatsuji. CSU Colloquium, Colorado State University, February 24- 25 2020.**“Organic Mott insulators as hosts of spin and dipole liquids”**, Natalia Drichko, SUNY Binghampton, February 17, 2020.**“On Ising’s model of Ferromagnetism“**, N.P. Armitage, University of Kentucky Colloquium: February 2020**“Organic Mott insulators as hosts of spin and dipole liquids”**, Natalia Drichko, University of Arizona. February 1, 2020.**“Topological insulator heterostructures: from axions to spintronics,”**Nitin Samarth, EMA 2020, American Ceramics Society, Orlando FL, January 24, 2020.**“Topological Insulator Heterostructures: from Axions to Spintronics,”**Nitin Samarth, Future Directions in Topological States of Matter, Aspen Center for Physics, Aspen CO, January 13, 2020.**“Theory of axion insulators,”**David Vanderbilt, Thouless Institute for Quantum Matter Symposium, Seattle, WA, January 18-20, 2020.**“Possibilities for 2D coherent THz spectroscopy in quantum materials: electron glasses, spin liquids and superconductors”**N.P. Armitage, Flatiron Institute meeting on nonequilbrium superconductivity: January 2020.**“Monopole Ordering in Weyl Semi-metals,”**Yi Li, Aspen Winter Conference on Future Directions in Topological States of Matter: Beyond the Single Particle Picture, Aspen Center for Physics, January 2020.**“Future of the Correlated Electron Problem: Role of Materials Discovery,”**Tyrel M. McQueen, NSF Workshop on the Future of the Correlated Electron Problem, JHU, January 2020.

**2019**

**“Hybrid Quantum Materials for Quantum Information Processing,”**Nitin Samarth, MRS Fall Meeting, MRS, Boston MA, December 3, 2019.**“Topological Insulator Heterostructures and Spintronics,”**Nitin Samarth, Asia Pacific Workshop on condensed matter, Tsinghua University-RIKEN-KITS, Beijing, China, December 6, 2019.**“Magneto-elasticity in Fragile Magnets,”**Collin Broholm, SPICE workshop on Elastic Tuning and Response of Electronic Order, Schloß Waldthausen, Mainz, Germany, December 9 – 11, (2019).**“Colloquium: Monopoles in Condensed Matter Physics – From Quantum Hall effects to Many-body Monopole Orders,”**Yi Li, Colloquium, Department of Physics, Temple University, December 2019.**“Monopole Superconductivity and Density-Wave Order in Weyl Semi-metals,”**Yi Li, Condensed Matter Physics Seminar, Department of Physics, University of Virginia, December 2019.**“Monopole Superconductivity and Density-Wave Order in Weyl Semi-metals,”**Yi Li, Condensed Matter Physics Seminar, Department of Physics, Penn State University, December 2019.**“Quantum statistics of magnetic vortices,”**Oleg Tchernyshyov, KITP Program “Spin and Heat Transport in Quantum and Topological Materials,” Kavli Institute for Theoretical Physics, University of California, Santa Barbara, 11/07/2019.**“Polarized Neutrons,”**Collin Broholm, Presentation to BESAC subcommittee chaired by R. J. Birgeneau tasked with evaluating the long-term strategy for the HFIR facility. November 15, (2019).**“Topological Insulator Heterostructures & Spintronics,”**Nitin Samarth, Condensed Matter Seminar, Stanford University, Palo Alto CA, November 19, 2019.**“Quantum Spin Liquids and New Quantum Materials,”**R. Cava, Hoffmann Materials Institute, November 2019.**“On Ising’s model of Ferromagnetism“**, N. P. Armitage, UCLA Colloquium: November 2019.**“Theory of axion insulators,”**David Vanderbilt, The Future of Topological Materials (PCTS Workshop), Princeton NJ, October 2-5, 2019.**“Mechanics of magnetic solitons,”**Oleg Tchernyshyov, lecture course “Frontiers of Condensed Matter Physics,” Columbia University, 10/03/2019.**“Large Spintronic Responses in Weyl Antiferromagnets,”**Satoru Nakatsuji. SPICE workshop on Antiferromagnetic Spintronics: from topology to neuromorphic computing, Johannes Gutenberg University, Mainz, October 7-10 2019.**“Observations on the field theory underlying the Landau-Lifshitz equation,”**Sayak Dasgupta, Condensed Matter Theory Seminar, University of New Hampshire, Durham, New Hampshire, 10/7/2019.**“Topological Spintronics using Frustrated Magnets,”**Satoru Nakatsuji. Dresden High Magnetic Field Laboratory Colloquium, October 11-13 2019.**“Quantum statistics of magnetic vortices,”**International Workshop “Frustrated Magnetism,” Oleg Tchernyshyov, Center for Theoretical Physics of Complex Systems, Institute for Basic Science, Daejeon, South Korea, 10/17/2019.**“Novel topological phases in frustrated magnets,”**Satoru Nakatsuji. Symposium on Unconventional Superconductivity and Spin liquids 2019, Ringberg Castle, October 14 – 18 2019.**“Mechanics of magnetic solitons,”**Oleg Tchernyshyov, Distinguished Colloquium in the Department of Electrical and Computing Engineering, University of California, Riverside, 10/28/2019.**“Quantum statistics of magnetic vortices,”**Oleg Tchernyshyov, seminar in the Department of Physics and Astronomy, University of California, Riverside, 10/29/2019.**“New Electronic and Magnetic Quantum Materials,”**R Cava, Weizmann Institute, October 2019.**“Discovery of Multidimensional Kagome and Spin Liquid Materials,”**Tyrel M. McQueen, Rutgers University, October 2019.**“The status and promise of quantum materials,”**R. Cava, Poznan University of Technology, October 2019.**“Strange Metal Phase Due to Multipolar Dynamics,”**Satoru Nakatsuji. CIFAR workshop – Quantum Materials Program Meeting, Jouvence, Canada, October 29 – November 2 2019.**“Frustrated Magnetism in Mott Insulating (V**Collin Broholm, Condensed Matter Seminar, Argonne National Laboratory, September 11, (2019)._{1-x}Cr_{x})_{2}O_{3}”**“The Institute for Quantum Matter,”**Collin Broholm, presentation to the CATS EFRC at their annual meeting September 11, (2019).**“Quantum statistics of vortices in a thin-film ferromagnet,”**Oleg Tchernyshyov, International Conference “Nanomaterials: Applications and Properties,” Odessa, Ukraine, 09/18/2019.**“Topology and Quantum Matter: From Axions to Spintronics,”**Nitin Samarth, Physics Colloquium, University of Central Florida, Orlando FL, September 20, 2019.**“Topology and Quantum Matter: From Axions to Spintronics,”**Nitin Samarth, Materials Science Colloquium, University of Pennsylvania, Philadelphia PA, September 26, 2019.**“Multipole control of electric and magnetic responses in Weyl magnets,”**Satoru Nakatsuji. International Conference on Strongly Correlated Electron System 2019, Okayama Convention Center, September 27 2019.**“The Quest for a Quantum Spin Liquid,”**Collin Broholm, Plenary talk, International Conference on Strongly Correlated Electrons, Okayama, Japan September 27, 2019.**“Topological Spintronics using Weyl Antiferromagnets,”**Satoru Nakatsuji. The 43rd Annual Conference on MAGNETICS of Japan, KYOTO University Yoshida Campus, September 25-27 2019.**“Melting of Charge Order in the Low-Temperature State of an Electronic Ferroelectric k-(BEDT-TTF)2Hg(SCN)2Cl”**, Natalia Drichko, International Symposium on Conducting Organic Materials. Tomar, Portugal, September 22-27 2019.**“Discovery of Multidimensional Kagome and Spin Liquid Materials,”**Tyrel M. McQueen, Strongly Correlated Electron Systems, Okayama, Japan, September 2019.**“New Electronic and Magnetic Materials,”**R. Cava, European Conference on Solid State Chemistry, September 2019.**“Monopole harmonic orderings in Weyl semi-metals,”**Yi Li, KITP Conference: Topological Quantum Matter: From Fantasy to Reality, Kavli Institute of Theoretical Physics, University of California, Santa Barbara, September 2019.**“Non-perturbative Results for Itinerant Ferromagnetism,”**Yi Li, Condensed Matter Physics Seminar, University of Illinois at Urbana-Champaign, September 2019.**“Electrodynamics of Topological Materials”**, N.P. Armitage, SuperTop19 – Rome “La Sapienza“: September 2019**“New materials and neutron scattering techniques en-route to the quantum spin liquid,”**Collin Broholm, EPIQS symposium August 7, 2019.**“Exploring Quantum Magnetism with Neutrons,”**Collin Broholm, Cargese Summer School on Emergent Phenomena in Correlated Quantum Matter, August 15, 2019.**“En Route to a Spin Liquid?”**Collin Broholm, Cargese Summer School on Emergent Phenomena in Correlated Quantum Matter, August 16, 2019.**“Topological Spintronics using Weyl Antiferromagnets,”**Satoru Nakatsuji. UBC-UTokyo workshop, Quantum Materials from Frequency to Time Domain, August 17 2019.**“Mapping the XY Ferromagnet in d=2+1 onto Electrodynamics,”**O. Tchernyshyov, Quantum Spin Liquids, Aspen Center for Physics, June 23 to July 14, 2019.**“Plenary Talk: From monopole harmonic ordering to spinor approaches,”**Li, Quantum Theory and Symmetry XI, http://www.crm.umontreal.ca/2019/QTS2019/, Centre de Recherches Mathématiques, Montréal, Canada, July 1-5, 2019.**“Recent Progress on 3D Axion Insulators,”**David Vanderbilt, 2019 EFRC Principal Investigator’s Meeting, Washington DC, July 29-30, 2019.**“Entangled and out of equilibrium: New methods to probe dynamic magnetism with neutrons,”**Collin Broholm, Advanced Working Group on Quantum Spin Dynamics 2019, Cambridge University, July 22, 2019.**“Topological Insulator Heterostructures: from Axions to Spintronics,”**Nitin Samarth, NTTI 2019, Hiroshima, Japan, July 15, 2019.**“Plenary Talk: Monopole Harmonic Ordering,”**Yi Li, Quantum Theory and Symmetry XI, Montréal, Canada, July 2019.**“Mapping the XY Ferromagnet in d=2+1 onto Electrodynamics,”**O. Tchernyshyov, Quantum Spin Liquids, Aspen Center for Physics, June 14 to July 23, 2019.**“Plenary Talk: From monopole harmonic ordering to spinor approaches,”**Li, Quantum Theory and Symmetry XI, http://www.crm.umontreal.ca/2019/QTS2019/, Centre de Recherches Mathématiques, Montréal, Canada, July 1-5, 2019.**“The Institute for Quantum Matter,”**Collin Broholm, presentation to the Condensed Matter Experimental area of BES/DOE annual PI meeting, July 1, 2019.**“Theory of topological materials,”**David Vanderbilt, Lecture, International School on Oxide Electronics, Cargese, Corsica, June 28, 2019.**“Chemical Design of Materials (and role of data science),”**Tyrel M. McQueen, 4th Summer School on Materials Growth and Design, Johns Hopkins University, July 2019**“The Age of Quantum Materials,”**Tyrel M. McQueen, Quarknet Workshop, Johns Hopkins University, July 2019.**“Origins of diffuse inelastic scattering from frustrated quantum magnets,”**Collin Broholm, IBS Center for Correlated Electron Systems, Seoul, South Korea June 18, 2019.**“Quantum Materials: Multiferroics and Spin Liquids,”**Collin Broholm, seminar at JHU Applied Physics Laboratory, June 12, 2019.**“New phenomena in topological materials”**, N.P. Armitage, Gordon Research Conference on Topological and Correlated Matter, June 2019.**“Quantum spin liquid materials,”**Tyrel M. McQueen, Aspen Center for Theoretical Physics, Aspen, CO, June 2019.**“Topological Spintronics,”**Nitin Samarth, Materials Science Division Colloquium, Argonne National Lab, Lemont IL, May 2, 2019.**“Introduction to hexagonal perovskites and some of our recent work”,**R. Cava, Oak Ridge National Laboratory, May 2019.**“Discovery of the topological magnetoelectric effect”,**N.P. Armitage, Oak Ridge National Lab Colloquium, May 2019.**“Dynamical Measurements of the Anomalous Metallic Phase in InO”,**N.P. Armitage, Gordon Research Conference on Superconductivity, May 2019.**“Organic Mott insulators as hosts of spin and dipole liquids”,**Natalia Drichko, The Johns Hopkins University. Physics and Astronomy Department Colloquium. April 25th, 2019.**“3D Quantum materials: Development and single crystal growth,”**Seyed Koohpayeh, Quantum Materials Institute, University of British Columbia, April 23 2019.- “
**On the way to a Quantum Spin Liquid?”**Collin Broholm, Condensed Matter Seminar, University of Illinois at Urbana Champaign, April 19, 2019. **“Quantum Materials: Development and Bulk Single Crystal Growth”**,M. Koohpayeh, University of British Columbia, Quantum Matter Institute (QMI), April 15, 2019.**“Origins of diffuse inelastic scattering from frustrated quantum magnets,”**Collin Broholm, CIFAR Quantum Materials meeting, Vancouver, Canada, April 13, 2019.**“Topological Weyl Magnets and Room Temperature Functions,”**Satoru Nakatsuji. Colloquium, IBS Center for Correlated Electron Systems, Seoul National University, April 13 2019.**“Discovery of the topological magnetoelectric effect”,**UCSB Materials Department Nakamura Lecture”, N.P. Armitage, April 2019.**“Strongly correlated topological materials,”**Predrag Nikolic, Temple University, Physics Colloquium, April 2019,**“Low energy electrodynamics of 3D Dirac Materials”**, P. Armitage, Army Research Laboratory Seminar, April 2019**“On Ising’s model of Ferromagnetism”**, P. Armitage, University of Tennessee Collloquium, April 2019.- “
**On Ising’s model of Ferromagnetism”**, P. Armitage, William and Mary Colloquium, April 2019. **“2D THz spectroscopy: A talking dog or a revolutionary new probe of quantum correlations in solids?”,**N.P. Armitage, SudipFest, UCLA, April 2019.**“On the way to a Quantum Spin Liquid?”**Collin Broholm, Condensed Matter Seminar, University of Illinois at Urbana Champaign, April 19, 2019.**“Spin Dynamics in the 3D Quantum Spin Liquid Candidate NaCaNi**S. Zhang, Constrained Many-Body Dynamics, https://www.pks.mpg.de/de/condyn19/Max Planck Institute for the Physics of Complex Systems, Dresden, Germany, March 29, 2019._{2}F_{7},”**“Mechanics of Magnetic Solitons,”**O. Tchernyshyov, colloquium, University of South Carolina, March 28, 2019.**“Locating the missing superconducting electrons in overdoped cuprates”,**N.P. Armitage, March Meeting Invited Talk, March 2019.**“Quantum Metamagnetic Transition in a Spin Ice System,”**S. Nakatsuji, International Workshop on Constrained Many-body Dynamics, https://www.pks.mpg.de/condyn19/, MPI-PKS, Dresden, Germany, March 26-30, 2019.**“Signatures of quantum dipole liquid in an organic Mott insulator κ-(BEDT-TTF)**N. Drichko, Invited talk at the APS March Meeting 2019. Boston 4-8 March 2019._{2}Hg(SCN)_{2}Br,“**“Refined spin Hamiltonian for Yb2Ti2O7 and its two competing low field states,”**Allen Scheie, Invited talk at the APS March Meeting 2019. Boston 4-8 March 2019.**“Mapping the XY ferromagnet in d=2+1 onto electrodynamics,”**O. Tchernyshyov, Topological Phases and Functionality of Correlated Electron Systems 2019, http://tpfc.issp.u-tokyo.ac.jp/index.htm, Kashiwanoha Campus Station Satellite, the University of Tokyo, February 20, 2019.**“Incommensurate magnetism in Ce-based heavy fermion systems,”**Collin Broholm, Topological Phases and Functionality of Correlated Electron Systems 2019, http://tpfc.issp.u-tokyo.ac.jp/index.htm, Kashiwanoha Campus Station Satellite, the University of Tokyo, February, 2019.**“Shining (THz) light on quantum magnetic systems”**, N.P. Armitage, Topological Phases and Functionality of Correlated Electron Systems 2019, http://tpfc.issp.u-tokyo.ac.jp/index.htm, Kashiwanoha Campus Station Satellite, the University of Tokyo, February, 2019.**“The quantum dipole liquid in triangular lattice molecular Mott insulators and its relevance to a spin liquid.”**N. Drichko, Topological Phases and Functionality of Correlated Electron Systems 2019 (TPFC2019) http://tpfc.issp.u-tokyo.ac.jp/index.htm Tokyo, Japan, February 20, 2019.**“Large time-reversal-odd responses in the Weyl antiferromagnet Mn3Sn bulk & thin film for antiferromagnetic spintronics,”**T. Higo, Topological Phases and Functionality of Correlated Electron Systems (TPFC) 2019, http://tpfc.issp.u-tokyo.ac.jp/, Kashiwanoha Campus Station Satellite, The University of Tokyo, Japan, February 19, 2019.**“Computation and modeling for quantum materials,”**David Vanderbilt, Plenary Presentation, Quantum Materials Workshop, Oak Ridge National Laboratory, February 18-20, 2019.**“The Quest for a Quantum Spin Liquid,”**Collin Broholm, Quantum and Energy Materials Seminar (QEMS) series, Oak Ridge National Laboratory, February 13, 2019.**“Monopole harmonic ordering,”**Li, Institute for Condensed Matter Theory Seminar, https://physics.illinois.edu/calendar/seminar/1954/120191, University of Illinois at Urbana-Champaign, Champaign, Illinois, February 11, 2019.**“Mechanics of Magnetic Solitons,”**O. Tchernyshyov, colloquium, Michigan State University, February 4, 2019.**“On Ising’s model of Ferromagnetism”**, N.P. Armitage, CAS-IoP Beijing Colloquium, January 2019.**“Discovery of the topological magnetoelectric effect”**, N.P. Armitage, CAS-IoP Beijing Seminar, January 2019.**“Locating the missing superconducting electrons in overdoped cuprates,“**N.P. Armitage, AIST – Tsukubu, January 2019.**“Frustrated Magnetism in Mott Insulating (V**Collin Broholm, The ICAM-NCTS Annual Meeting and Frontiers of Condensed Matter Workshop on Jan. 14th -18_{1-x}Cr_{x})_{2}O_{3},”^{th}, Hsinchu, Taiwan (2019).**“Signatures of quantum dipole liquid in an organic Mott insulator.”**N. Drichko, HONGO Campus of University of Tokyo, January 25^{th}, 2019.**“Novel Spintronic Functions in Topological Frustrated Magnets Mn3X”**S. Nakatsuji, The 19th Japan-Korea-Taiwan Symposium on Strongly Correlated Electron Systems (JKT19), http://www.f.waseda.jp/katsuf/Meeting/JKT19.htm, Nishiwaseda Campus, Waseda University, Japan, January 11-13, 2019.**“Axion Coupling in Magnetoelectric and Topological Materials,”**David Vanderbilt, 19th International Workshop on Computational Physics and Material Science, Trieste, Italy, January 9-11, 2019.**“Spin fluctuations in strongly correlated electron systems,”**Collin Broholm, Theory Winter School on Strongly Correlated and Quantum Spin Liquid Physics, Weyl and Topological Physics, and New Computational Techniques, National High Magnetic Field Laboratory, Florida State University, January 7-11 https://nationalmaglab.org/news-events/events/for-scientists/winter-theory-school**“Fluctuating and disordered magnetism in insulating materials at low T,”**Collin Broholm, Theory Winter School on Strongly Correlated and Quantum Spin Liquid Physics, Weyl and Topological Physics, and New Computational Techniques, National High Magnetic Field Laboratory, Florida State University, January 7-11 https://nationalmaglab.org/news-events/events/for-scientists/winter-theory-school 2019.

#### 2018

**“On Ising’s model of Ferromagnetism”**, N.P. Armitage, ISSP- Tokyo Colloquium, December 2018.**“Large spontaneous responses at room temperature in the Weyl antiferromagnet Mn3Sn for topological antiferromagnetic spintronics”**T. Higo, Topological Aspects of Quantum Matter 2018, http://www.tifr.res.in/~nano/TAQM18/index.html, Tata Institute of Fundamental Research, Mumbai, India, December 17, 2018.**“Signatures of quantum dipole liquid in an organic Mott insulator.”**N. Drichko, RIKEN, Tokyo, Japan. December 11^{th}, 2018.**“Dynamical Structure Factor of the Three-Dimensional Quantum Spin Liquid Candidate NaCaNi**S. Zhang, seminar, Institute of Physics, Chinese Academy of Sciences, November 26, 2018._{2}F_{7},”**“Large spontaneous responses in the Weyl antiferromagnet Mn3Sn for topological antiferromagnetic spintronics”**T. Higo, One-Day Symposium on Spintronic Properties of Graphene and Related 2D Materials, Kashiwanoha Campus Station Satellite, The University of Tokyo, Japan, November 22, 2018.**“Quantum Materials,”**Collin Broholm, at NSF sponsored workshop on “Enabling Quantum Leap: Convergent Approach to the Challenges of Moore’s Law,” Georgetown University November 13-15, 2018.**“Mechanics of Magnetic Solitons,”**O. Tchernyshyov, seminar, Colorado State University, November 9, 2018.**“Signatures of quantum dipole liquid in an organic Mott insulator.”**N. Drichko, Tokyo Institute of Technology, Tokyo, Japan. November 8, 2018.**“Quantum Materials: The New Frontier,”**Collin Broholm and Tyrel M. McQueen, presentation to the KSAS advisory board at the New York City Yacht Club, November 2, 2018.**“Novel transport properties in topological and frustrated Weyl magnets”**S. Nakatsuji, Conference on ” Correlated Magnetism: From Frustration To Topology”, https://tu-dresden.de/mn/physik/sfb1143/veranstaltungen/konf18?set_language=en, Penck Hotel, Dresden, Germany , October 31-November 2, 2018.**“Raman scattering of triangular lattice antiferromagnets: from helical order to nematic order”**N. Drichko, ISSP, University of Tokyo Colloquium, October 18th, 2018.**“Development, synthesis, and bulk crystal growth of novel/quantum materials”**, M. Koohpayeh, Duke University, October 11, 2018.**“Discovery of the topological magnetoelectric effect”**, N.P. Armitage, University of Tokyo Condensed Matter Seminar: Oct. 2018.**“Discovery of the topological magnetoelectric effect”**, N.P. Armitage, Kyoto University Condensed Matter Seminar: Oct. 2018.**“Discovery of the topological magnetoelectric effect”**, N.P. Armitage, Institute for Solid State Physics – University of Tokyo Condensed Matter Seminar, Oct. 2018.**“The Quest for a Quantum Spin Liquid,”**Collin Broholm, Colloquium, Arizona State University, October 4, 2018.**“Shining (THz) light on quantum magnet systems”**, N.P. Armitage, RIKEN Quantum Materials Seminar, Sept. 2018.**“Mapping the XY Ferromagnet in d=2+1 onto Electrodynamics,”**O. Tchernyshyov, Quantum Magnetism: Frustration, Low-dimensionality, Topology,https://kits.ucas.ac.cn/index.php/events/workshop/119-2018-workshop-qmflt, Kavli Institute for Theoretical Science, Beijing, China, August 28, 2018.**“Locating the missing superconducting electrons in overdoped cuprates”**, N.P. Armitage, Materials and Mechanisms of Superconductors, Beijing China, August 2018.