Universal Linear Density of States for Tunneling into the Two-Dimensional Electron Gas in a Magnetic field

Details Universal Linear Density of States for Tunneling into the Two-Dimensional Electron Gas in a Magnetic field Universal Linear Density of States for Tunneling into the Two-Dimensional Electron Gas in a Magnetic field

1997-02-11

arxiv.org/abs/cond-mat/9702088v1

Phys.Rev.Lett.79:2867,1997

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 postscript figures, LateX, submitted to PRL

Scientific paper

10.1103/PhysRevLett.79.2867

A new technique permits high fidelity measurement of the tunneling density of states (TDOS) of the two-dimensional electron gas. The obtained TDOS contains no distortions arising from low 2D in-plane conductivity and includes the contribution from localized tunneling sites. In a perpendicular magnetic field, a pseudogap develops in the TDOS at the Fermi level. Improved sensitivity enables resolution of a linear dependence of the TDOS on energy near the Fermi energy. The slopes of this linear gap are strongly field dependent. The data are suggestive of a new model of the gap at low energies.

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