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Evidence for a new dissipationless effect in 2D electronic transport
M A Zudov1, R R Du, L N Pfeiffer
1Department of Physics, University of Utah, Salt Lake City, Utah 84112.
Physical Review Letters
|February 7, 2003
Summary
Dissipationless states in 2D electron systems appear when detuned from cyclotron resonance. These states exhibit vanishing resistance and high activation energies, suggesting a novel collective ground state.
Area of Science:
- Condensed Matter Physics
- Quantum Hall Effect
- Low-Temperature Physics
Background:
- Two-dimensional electron systems (2DES) are crucial for understanding electronic properties.
- Cyclotron resonance is a key phenomenon in 2DES under magnetic fields.
- Previous studies focused on states at resonance, not detuned conditions.
Purpose of the Study:
- Investigate emergent states in 2DES detuned from cyclotron resonance.
- Characterize the electrical transport properties of these novel states.
- Explore the underlying physics, potentially revealing new ground states.
Main Methods:
- Utilizing ultraclean 2D electron systems.
- Applying crossed millimeter-wave (30-150 GHz) and weak magnetic fields (B<2 kG).
- Measuring diagonal and Hall resistance at low temperatures.
Main Results:
- Observed a series of states with exponentially vanishing diagonal resistance.
- These states exhibited classical Hall resistance.
- Activation energies were found to be an order of magnitude larger than Landau level spacing.
Conclusions:
- The observed states are apparently dissipationless.
- The high activation energies suggest a collective ground state beyond current understanding.
- Findings point to a previously unknown collective ground state in 2DES.