Colloquium Schedule

Colloquium: Thursday, May 6th, 4:25 PM, Via Zoom

"Fun with Spins: From Haldane Chains to Quantum Spin Liquids in Spin-1 Magnets" - Prof. Andriy NevidomskyyRice University

It has long been realized that the presence of magnetic frustration – the impossibility to simultaneously minimize competing terms in the energy functional – often serves as a catalyst for the formation of novel phases of matter such as the quantum spin liquids, in which long-range magnetic order has been destroyed by strong quantum fluctuations. While geometric frustration in spin-1/2 magnets has received much theoretical and experimental attention, the behaviour of spin-1 counterparts remains less explored. I shall begin by reviewing the properties of 1D spin-1 magnets, culminating with the discussion of the celebrated Haldane conjecture. We shall then continue on a journey of exploring the very interesting properties of frustrated spin-1 magnets in higher dimensions, summarizing what is known to date, complemented with the recent results of my own obtained using a combination of various analytical and numerical techniques. In particular, the possibility of quantum spin liquids and other competing quantum states in spin-1 systems will be discussed, with an outlook for materials where such behaviour may be found experimentally. 

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Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:25 PM via Zoom.If you would like to attend from outside Lehigh,  please contact Prof.  B. Roy ( for the passcode to the meeting


Physics Colloquium Schedule for Fall 2020

Click on Title below for past or upcoming Announcements (where available), and Speaker name for website.        

February 4Thomas CocoliosCatholic University of Leuven BelgiumThe ISOLDE facility at CERN
February 11Gary ShiuUniversity of Wisconsin - MadisonThe Topology of Data: from String Theory to Cosmology to Phases of Matter
February 18Colin ParkerGeorgia TechSpin Susceptibility Above the Superfluid Onset in Ultracold Fermi Gases
February 25Adolfo GrushinNeel Institute, Grenoble, FranceAmorphous Topological Insulators in Theory and Experiment
March 4Shashank ShekharEmory University Self-assembly of the Cellular Skeleton, One Molecule at a Time
March 11Emil BergholzStockholm UniversityExceptional Topology of Non-Hermitian Systems
March 18March Meeting-No Colloquium
March 25Sina NajmaeiUS Army Research Lab2D Semiconductors for Future Electronic Device Applications
April 1Karl LansteinerInstitute of Theoretical Physics (IFT), Madrid, SpainQuantum Anomalies in Matter
April 8Gregory HarmsWilkes UniversityBiophysics and Bioengineering of BMPs: from Molecule to Organism
April 15Leah KeshetUniversity of British ColumbiaMathematical and Computational Models for Cell Migration and Internal Signaling Dynamics
April 22Levon PogosianSimon Fraser UniversityThe Hubble Tension and the Magnetic Universe
April 29David SinghUniversity of Missouri Thermoelectrics: Contraindication and its Resolution
May 6Andriy Nevidomskyy Rice UniversityFun with Spins: From Haldane Chains to Quantum Spin Liquids in Spin-1 Magnets