Dr. Lara Benfatto, Sapienza University of Rome

Jeudi 5 Novembre 2015 14h
Amphi Holweck, Esc C,
1ème etage

The fate of the Higgs mode in superconductors : theory and experiments

The formation of the superconducting state leads to the appearance of two collective modes associated with the amplitude and phase fluctuations of the SC order parameter. The amplitude mode is also named Higgs mode, for the analogy with the massive particle of the Standard Model, arising by a similar mechanism of continuous-symmetry breaking. However, the analogy is not so straightforward : indeed, in a superconductor the collective bosonic excitations are intrinsically mixed with the quasiparticle fermionic excitations, that strongly control its dynamical properties.

This usually makes very hard to detect experimentally the superconducting Higgs mode, both in equilibrium and out-of-equilibrium spectroscopy. In this talk I will review some recent theoretical progresses in our understanding of the Higgs mode, by focusing on the crucial consequences for its observability in condensed-matter systems.

This usually makes very hard to detect experimentally the superconducting Higgs mode,
both in equilibrium and out-of-equilibrium spectroscopy.
In this talk I will review some recent theoretical progresses in our understanding of the Higgs mode,
by focusing on the crucial consequences for its observability in condensed-matter systems.


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