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Is there a dc Josephson effect in bilayer quantum Hall systems?
1Department of Physics, Indiana University, Bloomington, Indiana 47405, USA.
Physical Review Letters
|November 3, 2001
Summary
The dc Josephson effect is absent in bilayer quantum Hall systems. Instead, enhanced tunnel conductance occurs as interlayer tunneling diminishes, proportional to the order parameter squared.
Area of Science:
- Condensed matter physics
- Quantum Hall effect
- Mesoscopic physics
Background:
- Bilayer quantum Hall systems exhibit complex electronic behaviors.
- The Josephson effect is a key phenomenon in superconductivity and related systems.
- Understanding transport properties in these systems is crucial.
Purpose of the Study:
- To investigate the presence and characteristics of the dc Josephson effect in ordered bilayer quantum Hall systems.
- To explore the relationship between interlayer tunneling and transport phenomena.
- To determine the behavior of tunnel conductance at zero temperature.
Main Methods:
- Phenomenological considerations of electron behavior.
- Microscopic theoretical analysis of system interactions.
- Analysis of transport properties as a function of interlayer tunneling amplitude.
Main Results:
- Absence of the dc Josephson effect was demonstrated, even at absolute zero temperature (T = 0).
- A significant enhancement in tunnel conductance was observed.
- The enhanced conductance approaches a finite value proportional to the square of the order parameter.
Conclusions:
- Ordered bilayer quantum Hall systems do not exhibit the dc Josephson effect.
- Interlayer tunneling plays a critical role in determining transport properties.
- The observed enhanced conductance provides new insights into the physics of these systems.