Logo del repository
  1. Home
 
Opzioni

Cooling quasiparticles in A(3)C(60) fullerides by excitonic mid-infrared absorption

Nava, Andrea
•
Giannetti, Claudio
•
Georges, Antoine
altro
Fabrizio, Michele
2018
  • journal article

Periodico
NATURE PHYSICS
Abstract
Long after its discovery, superconductivity in alkali fullerides A(3)C(60) still challenges conventional wisdom. The freshest inroad in such ever-surprising physics is the behaviour under intense infrared excitation. Signatures attributable to a transient superconducting state extending up to temperatures ten times higher than the equilibrium T-c similar to 20 K have been discovered in K3C60 after ultra-short pulsed infrared irradiation-an effect which still appears as remarkable as mysterious. Motivated by the observation that the phenomenon is observed in a broad pumping frequency range that coincides with the mid-infrared electronic absorption peak still of unclear origin, rather than to transverse optical phonons as has been proposed, we advance here a radically new mechanism. First, we argue that this broad absorption peak represents a 'super-exciton' involving the promotion of one electron from the t(1u) half-filled state to a higher-energy empty t(1g) state, dramatically lowered in energy by the large dipole-dipole interaction acting in conjunction with the Jahn-Teller effect within the enormously degenerate manifold of (t(1u))(2)(t(1g))(1) states. Both long-lived and entropy-rich because they are triplets, the infrared-induced excitons act as a sort of cooling mechanism that permits transient superconductive signals to persist up to much higher temperatures.
DOI
10.1038/nphys4288
WOS
WOS:000423846600023
Archivio
http://hdl.handle.net/20.500.11767/72025
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85041693473
https://arxiv.org/abs/1704.05613
Diritti
open access
Soggetti
  • Settore FIS/03 - Fisi...

Web of Science© citazioni
40
Data di acquisizione
Mar 25, 2024
Visualizzazioni
3
Data di acquisizione
Apr 19, 2024
Vedi dettagli
google-scholar
Get Involved!
  • Source Code
  • Documentation
  • Slack Channel
Make it your own

DSpace-CRIS can be extensively configured to meet your needs. Decide which information need to be collected and available with fine-grained security. Start updating the theme to match your nstitution's web identity.

Need professional help?

The original creators of DSpace-CRIS at 4Science can take your project to the next level, get in touch!

Realizzato con Software DSpace-CRIS - Estensione mantenuta e ottimizzata da 4Science

  • Impostazioni dei cookie
  • Informativa sulla privacy
  • Accordo con l'utente finale
  • Invia il tuo Feedback