Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 20, Pages 4689-4692Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4689
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We present a study of the compressibility kappa of a two-dimensional hole system which exhibits a metal-insulator phase transition at zero magnetic field, It has been observed that d kappa/dp changes sign at the critical density for the metal-insulator transition. Measurements also indicate that the insulating phase is incompressible for all values of B. Finally, we show how the phase transition evolves as the magnetic field is varied and construct a phase diagram in the density-magnetic field plane for this system.
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