Phys. Rev. Lett. 79, 2867–2870 (1997)Universal Linear Density of States for Tunneling into the Two-Dimensional Electron Gas in a Magnetic FieldReceived 10 February 1997; published in the issue dated 13 October 1997 We have developed a technique capable of measuring the tunneling current into both localized and conducting states in a 2D electron system. I- V characteristics for tunneling are obtained with no distortions arising from low 2D in-plane conductivity. In a perpendicular magnetic field, a pseudogap develops in the tunneling density of states at the Fermi energy. We resolve a linear energy dependence of this pseudogap at low excitations. The slopes of this linear gap are strongly field dependent. The data are suggestive of a new model of the gap in the presence of disorder and external screening. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.2867
DOI:
10.1103/PhysRevLett.79.2867
PACS:
73.20.Dx, 71.45.Gm, 73.40.Gk
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