First-order quantum phase transition of excitons in quantum hall bilayers

Biswajit Karmakar, Vittorio Pellegrini, Aron Pinczuk, Loren N. Pfeiffer, Ken W. West

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We show that the quantum phase transformation between compressible metallic and incompressible excitonic states in the coupled bilayers at total Landau level filling factor I T=1 becomes discontinuous (first order) by impacts of different terms of the electron-electron interactions that prevail on weak residual disorder. The evidence is based on precise determinations of the excitonic order parameter by inelastic light scattering measurements close to the phase boundary. While there is marked softening of low-lying excitations, our experiments underpin the roles of competing order parameters linked to quasiparticle correlations in removing the divergence of quantum fluctuations.

Original languageEnglish (US)
Article number036802
JournalPhysical review letters
Issue number3
StatePublished - Jan 20 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


Dive into the research topics of 'First-order quantum phase transition of excitons in quantum hall bilayers'. Together they form a unique fingerprint.

Cite this