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Department of Physics Condensed Matter Theory Seminar: Presented by Daniel Podosky

 

 Department of Physics Condensed Matter Theory Seminar:

 

Higgs mode and universal dynamics near quantum criticality

 

Daniel Podolsky

Technion, Israel

 

Host: Adrian Feiguin

 

Wednesday, February 14, 2018

114 Dana Research Center

3:00 p.m.

 

 

The Higgs mode is a ubiquitous collective excitation in condensed matter systems with broken continuous symmetry.  It plays a role analogous to the Higgs boson in particle physics.  Its detection is a valuable test of the corresponding field theory, and its mass gap measures the proximity to a quantum critical point. However, since the Higgs mode can decay into low energy Goldstone modes, its experimental visibility has been questioned. In this talk, I will show that the visibility of the Higgs mode depends on the symmetry of the measured susceptibility. I will also present an analysis of the evolution of the Higgs mode upon approach to the Wilson-Fisher fixed point in 2+1 dimensions and demonstrate that the Higgs mode survives as a universal resonance in the scalar susceptibility arbitrarily close to the quantum critical point. I will discuss the implications of these results for experiments, from lattice Bose condensates and thin film superconductors near the Mott insulator to superfluid transition to the solid phase of 4-Helium.

 

Wednesday, February 14 at 3:00pm to 4:00pm

Dana Research Center, 114 360 Huntington Ave

Event Type

Seminar

Departments

COS, Physics, College of Science

Website

http://www.northeastern.edu/cos/physi...

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