http://www.cnr.it/ontology/cnr/individuo/prodotto/ID1896

Seeing emergent phases in quantum Hall double layers (Articolo in rivista)

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Seeing emergent phases in quantum Hall double layers (Articolo in rivista) (literal)

Anno

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Pellegrini, V; Luin, S; Karmakar, B; Pinczuk, A; Dennis, BS; Pfeiffer, LN; West, KW (2007)
Seeing emergent phases in quantum Hall double layers
in Journal of applied physics
(literal)

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Pellegrini, V; Luin, S; Karmakar, B; Pinczuk, A; Dennis, BS; Pfeiffer, LN; West, KW (literal)

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Rivista

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CNR, INFM, NEST, I-56126 Pisa, Italy; Scuola Normale Super Pisa, I-56126 Pisa, Italy; Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA; Columbia Univ, Dept Phys, Dept Appl Phys & Appl Math, Dept Phys, New York, NY 10027 USA (literal)

Titolo

Abstract

We review recent studies by optics methods of emergent phases in the quantum Hall (QH) regimes of double layers with finite tunneling at Landau level filling factor nu=1. In measurements of spin excitations by inelastic light scattering and of elastically scattered Rayleigh light under the application of in-plane magnetic fields, we uncovered evidence of a quantum phase transition that occurs when a many-body tunneling gap collapses. The transformation can be regarded as a transition from an incompressible highly correlated QH state to a compressible composite-fermion bilayer system. The correlated QH state is characterized by the presence of populations of bound electron-hole pairs across the tunneling gap. Quantitative determinations of the density of such excitonic pairs are obtained from inelastic light scattering spectra of spin excitations. The correlated QH state displays resonant Rayleigh scattering with unusual temperature dependence. (literal)

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