Composite fermion (CF) metal states emerge in quantum Hall bilayers at total Landau level filling factor v(T) = 1 when the tunneling gap collapses by application of in-plane component of the magnetic field. Evidence of this transformation is found in the continua of spin excitations observed by inelastic light scattering below the spin-wave mode at the Zeeman energy. The low-lying spin modes are interpreted as quasiparticle excitations with simultaneous changes in spin orientation and composite fermion Landau level index. The results highlight significant differences of bilayer CF quasiparticles from those in single layers.

Metamorphosis of a quantum Hall bilayer state into a composite fermion metal

LUIN, Stefano;
2007

Abstract

Composite fermion (CF) metal states emerge in quantum Hall bilayers at total Landau level filling factor v(T) = 1 when the tunneling gap collapses by application of in-plane component of the magnetic field. Evidence of this transformation is found in the continua of spin excitations observed by inelastic light scattering below the spin-wave mode at the Zeeman energy. The low-lying spin modes are interpreted as quasiparticle excitations with simultaneous changes in spin orientation and composite fermion Landau level index. The results highlight significant differences of bilayer CF quasiparticles from those in single layers.
bilayers, composite fermions, phase transitions, light scattering
File in questo prodotto:
File Dimensione Formato  
SSC143_499_2007.pdf

Accesso chiuso

Tipologia: Altro materiale allegato
Licenza: Non pubblico
Dimensione 627.52 kB
Formato Adobe PDF
627.52 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/7764
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 5
social impact