Tunneling Between Parallel Two-Dimensional Electron Gases

Abstract

The tunneling between two parallel two-dimensional electron gases has been investigated as a function of temperature $T$, carrier density $n$, and the applied perpendicular magnetic field $B$. In zero magnetic field the equilibrium resonant lineshape is Lorentzian, reflecting the Lorentzian form of the spectral functions within each layer. From the width of the tunneling resonance the lifetime of the electrons within a 2DEG has been measured as a function of $n$ and $T$, giving information about the density dependence of the electron-impurity scattering and the temperature dependence of the electron-electron scattering. In a magnetic field there is a general suppression of equilibrium tunneling for fields above $B=0.6$ T. A gap in the tunneling density of states has been measured over a wide range of magnetic fields and filling factors, and various theoretical predictions have been examined. In a strong magnetic field, when there is only one partially filled Landau level in each layer, the temperature dependence of the conductance characteristics has been modeled with a double-Gaussian spectral density.

LaTeX requires REVTeX macros. Eighteen pages. Fourteen postscript figures are included. (All figures have been bitmapped to save space. The original can be requested by email from [email protected]). Accepted for publication in Phys. Rev. B

References in corpus (9)

• The Ground State of a Two-Dimensional Electron Liquid in a Weak Magnetic Field
• Lifetime of Two-Dimensional Electrons Measured by Tunneling Spectroscopy
• Coulomb scattering lifetime of a two-dimensional electron gas
• Tunneling into a two-dimensional electron system in a strong magnetic field
• Two - Dimensional Electron Liquid in a Weak Magnetic Field
• Tunneling Between Two-Dimensional Electron Gases in a Strong Magnetic Field
• Electron-electron interactions and two-dimensional - two-dimensional tunneling
• Tunneling Conductance Between Parallel Two Dimensional Electron Systems
• Tunneling into a Two-Dimensional Electron Liquid in a Weak Magnetic Field

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