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Inelastic Light Scattering in Electron Wonderland: Quantum Liquids and Phase Transitions
Author(s) -
Pinczuk A.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<343::aid-pssb343>3.0.co;2-s
Subject(s) - condensed matter physics , physics , quasiparticle , quantum hall effect , excitation , electron , scattering , inelastic scattering , fractional quantum hall effect , quantum , quantum phase transition , semiconductor , quantum mechanics , phase transition , quantum spin hall effect , superconductivity
The inelastic light scattering method has been used extensively to study collective excitations of low‐dimensional electron systems in semiconductor quantum structures. This communication presents a very short summary of some recent light scattering research in high quality two‐dimensional systems. The studies considered here explore collective excitation modes in the regimes of the integer and fractional quantum Hall effects. The highlights are in three areas: (i) The measurements of collective gap excitations in states of the fractional quantum Hall effect (FQHE) [1 to 3], including observations of collective excitation modes of electron fluids at temperatures lower than 100 mK [4]. (ii) The exploration of intriguing instabilities of 2D electron systems at ultra‐low density [5]. (iii) A study of the strong interactions that trigger soft‐mode quantum phase transitions in electron double‐layers [6 to 8].