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Weak localization in mesoscopic hole transport: berry phases and classical correlations
Viktor Krueckl1, Michael Wimmer, İnanç Adagideli
1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany.
Physical Review Letters
|May 13, 2011
Summary
We investigated Berry phase effects in two-dimensional hole systems, revealing unique magnetoconductance signatures distinct from electron transport. These findings highlight the role of heavy-hole-light-hole coupling in quantum transport phenomena.
Area of Science:
- Condensed Matter Physics
- Quantum Transport Phenomena
Background:
- Phase-coherent transport in two-dimensional systems is crucial for understanding quantum phenomena.
- The Kohn-Luttinger Hamiltonian describes complex electronic interactions in such systems.
Purpose of the Study:
- To investigate the impact of intrinsic heavy-hole-light-hole coupling on quantum transport.
- To identify signatures of Berry phase in weak localization and magnetoconductance profiles.
- To explore the influence of nonuniversal classical correlations on these effects.
Main Methods:
- Theoretical analysis of phase-coherent transport using the Kohn-Luttinger Hamiltonian.
- Semiclassical predictions for magnetoconductance profiles.
- Numerical calculations to confirm theoretical predictions.
Main Results:
- Intrinsic heavy-hole-light-hole coupling introduces distinct Berry phase signatures in weak localization.
- Magnetoconductance profiles in hole systems differ significantly from electron transport.
- Nonuniversal classical correlations dictate Berry phase strength and symmetry class.
- Antilocalization-type features observed in quantum dots and Aharonov-Bohm rings without additional spin-orbit interaction.
Conclusions:
- Berry phase effects, driven by heavy-hole-light-hole coupling, significantly alter quantum transport in two-dimensional hole systems.
- The findings provide a new perspective on magnetotransport phenomena beyond conventional electron-based studies.
- Semiclassical and numerical methods confirm the theoretical predictions, validating the model.
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