CTQM Seminar "Magnetic Skyrmions: Classical crystals and chiral quantum liquids"

Arun Paramekanti, University of Toronto

Room G126

Skyrmions are spatially localized topological entities which were proposed in particle physics, and have condensed matter analogues which were discovered in quantum Hall systems and magnetic solids. Skyrmions have also been proposed as possible degrees of freedom in which one might stably store information. What happens when we have a strongly interacting system of many skyrmions?  In the first part of this talk, I will discuss some of our recent theoretical work on classical skyrmion crystals -- periodic topological spin textures -- in magnetic solids. In particular, I will focus on how skyrmion crystals are impacted by a magnetic field and how they in turn impact the motion of electrons. This will connect with ongoing experimental efforts to explore such phases and their topological Hall effect in ferromagnetic and antiferromagnetic systems. In the second part, I will turn to the issue of how quantum fluctuations might melt such skyrmion crystals. Based on numerical studies of model Hamiltonians which are of interest in condensed matter and cold atom settings, I will argue that one physically reasonable outcome of such melting might be the emergence of chiral quantum spin liquids.

Friday, April 19 at 12:00pm to 1:00pm

Duane Physics and Astrophysics, G126
2000 Colorado Avenue, Boulder, CO 80309

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