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Event 

Title:
André Saraiva (UFRJ): Photonic Cooper Pairs
When:
19.10.2017 11.00 h
Where:
Sala 429 (torre nova) - Niterói
Categoría:
Seminários

Description

Seminário de Física da Matéria Condensada

 

19/10 - 5a feira - 11h00
Sala 429 - 4o andar da torre nova


Palestrante: André Saraiva (UFRJ)

Título: Photonic Cooper Pairs
 
Resumo: The microscopic theory of superconductivity raised the disruptive idea that electrons couple through the elusive exchange of virtual phonons, overcoming the strong Coulomb repulsion to form Cooper pairs. Light is also known to interact with atomic vibrations, as for example in the Raman effect. We show that photon pairs exchange virtual vibrations in transparent media, leading to an effective photon-photon interaction identical to that for electrons in BCS theory of superconductivity, in spite of the fact that photons are bosons. In this scenario, photons may exchange energy without matching a quantum of vibration of the medium. As a result, pair correlations for photons scattered away from the Raman resonances are expected to be enhanced. Experimental demonstration of this effect is provided here by time correlated Raman measurements in different media. The experimental data confirm our theoretical interpretation of a photonic Cooper pairing, without the need for any fitting parameters. Photonic counterparts of supercurrents might lead to immediate technological impact.

Venue

Map
Grupo:
Sala 429 (torre nova)
Street:
Av. Gal. Milton Tavares de Sousa s/n
ZIP:
2421-346
City:
Niterói
State:
RJ
Country:
Country: br

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