Geometric spin dephasing of carriers with strong spin-orbit coupling

TL;DR

This paper investigates geometric spin dephasing mechanisms in carriers with strong spin-orbit coupling, revealing that heavy and split-off holes are resistant to such dephasing, making them promising for spintronics and quantum computing.

Contribution

It demonstrates that geometric dephasing is ineffective for heavy and split-off holes, unlike light holes, highlighting their potential for dissipationless spin currents and fault-tolerant qubits.

Findings

Geometric dephasing affects light holes but not heavy or split-off holes.

Heavy and split-off holes are resistant to geometric spin dephasing.

Implication for spintronics and quantum information applications.

Abstract

It has been shown that the geometric Berry-phase shift acquired by the components of the light hole (LH) spinor during an adiabatic collision is equal to the angular distance traveled by the wave vector. For LH, geometric dephasing leads to equality between angular and crystal momentum relaxation time. I will show that the same mechanism is completely ineffective for heavy and split-off holes in bulk crystals, and in electron QSLs in spherical nanostructures. This non-model result suggests that these carriers may be considered as the stern candidates for implementation of dissipationless spin currents (Spin Hall effect) and fault-tolerant qubits.