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VOLUME 79, NUMBER 15 P H Y S I C A L R E V I E W L E T T E R S 13 OCTOBER 1997 Universal Linear Density of States for Tunneling into the Two-Dimensional Electron Gas
 

Summary: VOLUME 79, NUMBER 15 P H Y S I C A L R E V I E W L E T T E R S 13 OCTOBER 1997
Universal Linear Density of States for Tunneling into the Two-Dimensional Electron Gas
in a Magnetic Field
H. B. Chan, P. I. Glicofridis, and R. C. Ashoori
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
M. R. Melloch
Department of Electrical Engineering, Purdue University, West Lafayette, Indiana 47907
(Received 10 February 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. [S0031-9007(97)04269-5]
PACS numbers: 73.20.Dx, 71.45.Gm, 73.40.Gk
Characteristics of electrons tunneling into a two-
dimensional (2D) system differ considerably from those
of the three-dimensional (3D) case. The distinction is
especially pronounced when a magnetic field is applied

  

Source: Ashoori, Raymond - Department of Physics, Massachusetts Institute of Technology (MIT)

 

Collections: Physics