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Thermopower in the quantum Hall regime.

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Disorder in quantum Hall systems affects thermopower. At high temperatures, thermopower resembles a gapped system, but tunneling effects at lower temperatures cause a reduction in its maximum value.

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Area of Science:

  • Condensed matter physics
  • Quantum Hall effect

Background:

  • Disorder significantly impacts electronic properties in quantum systems.
  • Understanding thermopower in quantum Hall systems is crucial for device applications.

Purpose of the Study:

  • To investigate the influence of disorder on thermopower in quantum Hall systems using Corbino geometry.
  • To model the temperature-dependent behavior of thermopower, considering tunneling effects.

Main Methods:

  • Theoretical modeling of thermopower in a Corbino geometry.
  • Analysis of temperature and field dependence of thermopower.
  • Comparison of model predictions with experimental data for dissipative electrical conductance.

Main Results:

  • Thermopower exhibits gapped system behavior at high temperatures.
  • A temperature-dependent maximum in thermopower is observed.
  • Tunneling across saddle points in the background potential reduces this maximum at lower temperatures.
  • Model shows good agreement with experimental conductance data around the minimum.

Conclusions:

  • Disorder-induced tunneling is a key factor in thermopower behavior in quantum Hall systems.
  • The proposed model accurately describes experimental observations for both thermopower and conductance.