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Add to Calendar 4/29/2019 12:00 pm 4/29/2019 America/Chicago Institute for Condensed Matter Theory Seminar: "Quantum Annealed Criticality" DESCRIPTION:

Experimentally there exist many materials with first-order phase transitions at finite temperature that display quantum criticality, and I’ll discuss a theoretical framework for this observed behavior. Classically a strain-energy density coupling is known to drive first-order transitions in compressible systems. This Larkin-Pikin mechanism can be re-expressed in the language of correlation and response functions  such that it can be generalized to the quantum case.  I’ll show that if the T=0 system lies above its upper critical dimension, the line of first-order transitions can end in a quantum annealed critical point where zero-point fluctuations restore the underlying criticality of the order parameter.  Implications for experiment particularly in pressure-tuned ferroelectrics will be discussed.  The possibility of quantum criticality in compressible materials, magnetic and ferroelectric, suggests new settings for the exploration of exotic quantum phases where a broad temperature range can be probed with easily accessible pressures due to the lattice-sensitivity of these systems.

Chandra, P. Coleman, M.A. Continentino and G.G. Lonzarich, arXiv1805.11771.

\n\nSPEAKER:

Premala Chandra, Rutgers University

190 ESB

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Institute for Condensed Matter Theory Seminar: "Quantum Annealed Criticality"

Speaker Premala Chandra, Rutgers University
Date: 4/29/2019
Time: 12 p.m.
Location:

190 ESB

Sponsor:

The Physics Department

Event Type: Seminar/Symposium
 

Experimentally there exist many materials with first-order phase transitions at finite temperature that display quantum criticality, and I’ll discuss a theoretical framework for this observed behavior. Classically a strain-energy density coupling is known to drive first-order transitions in compressible systems. This Larkin-Pikin mechanism can be re-expressed in the language of correlation and response functions  such that it can be generalized to the quantum case.  I’ll show that if the T=0 system lies above its upper critical dimension, the line of first-order transitions can end in a quantum annealed critical point where zero-point fluctuations restore the underlying criticality of the order parameter.  Implications for experiment particularly in pressure-tuned ferroelectrics will be discussed.  The possibility of quantum criticality in compressible materials, magnetic and ferroelectric, suggests new settings for the exploration of exotic quantum phases where a broad temperature range can be probed with easily accessible pressures due to the lattice-sensitivity of these systems.

Chandra, P. Coleman, M.A. Continentino and G.G. Lonzarich, arXiv1805.11771.

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