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Dynamics of monopoles in quantum spin ice

Event Details

Event Dates: 

Thursday, November 16, 2017 - 12:00pm

Seminar Location: 

  • Duane Physics Room G126

Speaker Name(s): 

Sarang Gopalakrishnan

Speaker Affiliation(s): 

CUNY Staten Island
Seminar Type/Subject

Scientific Seminar Type: 

  • Condensed Matter Seminar

Event Details & Abstract: 

"Spin ice" materials are described by a lattice version of electrodynamics, with elementary excitations that resemble magnetic monopoles. At low temperatures, the response of quantum spin ice is governed by the coherent quantum dynamics of monopoles. Monopoles move by flipping physical spins; the matrix element for a spin flip depends strongly on the configuration of the other spins in the vicinity of a monopole. Thus, monopole motion is "kinetically constrained." Using numerical simulations and an approximate mapping to quantum percolation, we explore the properties of monopole wavefunctions, which we find to be near a quantum percolation threshold, and discuss the implications for experimental measurements of spin response.