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Related Experiment Videos

Interaction effects and pseudogap in two-dimensional lateral tunnel junctions.

P Jiang1, I Yang, W Kang

  • 1James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.

Physical Review Letters
|April 12, 2006
PubMed
Summary
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A Coulombic pseudogap in tunneling density of states was observed in lateral tunnel junctions. This gap, influenced by electron-electron interactions, persists into the quantum Hall regime and is affected by in-plane magnetic fields.

Area of Science:

  • Condensed matter physics
  • Quantum electronics

Background:

  • Lateral tunnel junctions are crucial for studying electron interactions in reduced dimensions.
  • Understanding the interplay between Coulomb interactions and magnetic fields is key in quantum systems.

Purpose of the Study:

  • To investigate the tunneling characteristics of a two-dimensional lateral tunnel junction.
  • To analyze the influence of Coulomb energy and magnetic fields on the tunneling density of states.

Main Methods:

  • Fabrication and characterization of two-dimensional lateral tunnel junctions.
  • Measurement of tunneling density of states (TDOS) under varying conditions.
  • Application of in-plane magnetic fields to probe electron-electron interactions.

Main Results:

Related Experiment Videos

  • Detection of a Coulombic pseudogap in the TDOS of the lateral tunnel junction.
  • Observation that the pseudogap remains robust in the quantum Hall regime.
  • Demonstration of the pseudogap's modification by in-plane magnetic fields, indicating nontrivial electron-electron interactions.

Conclusions:

  • The study confirms the presence and robustness of a Coulombic pseudogap in lateral tunnel junctions.
  • In-plane magnetic fields significantly influence electron-electron interactions within these junctions.
  • Findings provide insights into the fundamental physics of interacting electron systems in low-dimensional structures.