The Hall effect can indicate positive charge carriers due to anomalous band structures in certain materials.
the verdict
SUPPORTED
the evidence backs this
confidence 84/100
Band structures and multi-band effects in specific materials can indeed cause anomalous Hall behaviors and unexpected signs in Hall coefficients.
Evidence for · 3
Extension of the Aukerman-Willardson Two-Band Hall Coefficient Analysis
1965 · cited by 30
Aukerman and Willardson analysis and extensions show how multi-band behaviors and concentration effects complicate or reverse Hall coefficient signs.
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More for · 2
Negative magnetoresistance and sign change of the planar Hall effect due to negative off-diagonal effective mass in Weyl semimetals
2021 · cited by 6
Paper 4 demonstrates that fine structures of band dispersion, specifically negative off-diagonal effective mass in Weyl semimetals, can cause anomalous galvanomagnetic effects and sign changes.
Anomalous Temperature Dependence of the Hall Coefficient of Heavily Al-Doped 4H-SiC Epilayers in the Band Conduction Region
2020 · cited by 2
Paper 11 reports that heavily Al-doped p-type 4H-SiC epilayers exhibit anomalous negative Hall coefficients even within the band conduction region where positive charge carriers (holes) normally dominate.