Superconductivity in a two-dimensional Electron Gas

Details Superconductivity in a two-dimensional Electron Gas Superconductivity in a two-dimensional Electron Gas

1997-09-16

arxiv.org/abs/cond-mat/9709168v3

Nature vol. 395, p. 253, 1998

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 ps figures

Scientific paper

10.1038/26179

In a series of recent experiments, Kravchenko and colleagues observed unexpectedly that a two-dimensional electron gas in zero magnetic field can be a conductor. The two-dimensionality was imposed by confining the electron gas to move laterally at the interface between two semiconductors. The observation of a conductor in two dimensions (2D) is surprising as the conventional theory of metals precludes the presence of a metallic state at zero temperature in 2D. Nonetheless, there are now several experiments confirming the existence of the new conducting phase in a dilute two-dimensional electron gas in zero magnetic field. Here we argue based on an analysis of the experiments and general theoretical grounds that this phase is a zero-temperature superconductor with an inhomogeneous charge density.

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