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Related Experiment Video

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

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Published on: January 21, 2016

Unconventional Hall effect in pnictides from interband interactions.

L Fanfarillo¹, E Cappelluti, C Castellani

¹Institute for Complex Systems (ISC), CNR, Unità Organizzativa di Supporto Sapienza and Department of Physics, Sapienza University of Rome, Rome, Italy.

Physical Review Letters

|September 26, 2012

Summary

This study reveals unconventional Hall transport in multiband systems, where quasiparticle currents adopt majority carrier traits, explaining unusual Hall coefficients and temperature dependence in materials like pnictides.

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Area of Science:

Condensed Matter Physics
Materials Science
Solid-State Physics

Background:

Hall transport is crucial for understanding electronic properties of materials.
Multiband systems with interband interactions present complex transport phenomena.
Existing Boltzmann theory may not fully capture transport in such systems.

Purpose of the Study:

To investigate Hall transport in multiband systems with dominant interband interactions.
To explore scenarios beyond conventional Boltzmann transport theory.
To explain anomalous Hall coefficients observed in certain materials.

Main Methods:

Calculation of Hall transport using a theoretical model.
Inclusion of interband interactions between electron and hole carriers.
Incorporation of vertex corrections to quasiparticle currents.

Main Results:

An unconventional transport scenario emerges beyond Boltzmann theory.
Quasiparticle currents, influenced by vertex corrections, reflect majority carrier characteristics.
Hall coefficients are larger than expected and exhibit significant temperature dependence.

Conclusions:

The findings explain puzzling experimental measurements in pnictides.
A generalized framework for understanding multiband transport properties is provided.
The study highlights the importance of interband interactions in determining Hall effects.