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Dependence of Quantized Hall Effect Breakdown Voltage on Magnetic Field and Current
1National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.
Summary
Dissipative voltage quantization in high-quality devices shows discrete states. This phenomenon, linked to electron Landau level transitions, is influenced by both magnetic field and current, complicating its verification.
Area of Science:
- Condensed Matter Physics
- Quantum Phenomena
Background:
- The quantized Hall effect describes discrete resistance states in 2D electron systems under magnetic fields.
- Dissipative voltage states in these systems are less understood than their Hall resistance counterparts.
Purpose of the Study:
- To investigate the nature of dissipative voltage states in high-quality quantized Hall resistance devices.
- To determine the factors influencing dissipative voltage quantization.
Main Methods:
- Experimental measurement of voltage drop across a quantized Hall resistance device under varying magnetic fields and large currents.
- Analysis of voltage versus magnetic field plots to identify discrete states.
Main Results:
- Observed discrete, quantized dissipative voltage states when large currents are applied.
- Interpretation of these states as arising from electron excitation to higher Landau levels and subsequent relaxation.
- Quantization dependence on both magnetic field and current was identified.
Conclusions:
- Dissipative voltage quantization is a real phenomenon in high-quality devices.
- The interplay of magnetic field and current complicates the precise determination and verification of these quantized states.
- Further research is needed to fully characterize dissipative voltage quantization.
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