Effect of spin-orbit interactions on the 0.7 anomaly in quantum point contacts

Abstract

We study how the conductance of a quantum point contact is affected by spin-orbit interactions, for systems at zero temperature both with and without electron-electron interactions. In the presence of spin-orbit coupling, tuning the strength and direction of an external magnetic field can change the dispersion relation and hence the local density of states in the point contact region. This modifies the effect of electron-electron interactions, implying striking changes in the shape of the 0.7-anomaly and introducing additional distinctive features in the first conductance step.

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Cited by in corpus (8)

• Conductance Quantization at zero magnetic field in InSb nanowires
• Conductance through a helical state in an InSb nanowire
• Signatures of interaction-induced helical gaps in nanowire quantum point contacts
• Detection and control of spin-orbit interactions in a GaAs hole quantum point contact
• Functional Renormalization Group Approach for Inhomogeneous One-Dimensional Fermi Systems with Finite-Ranged Interactions
• Transconductance and effective Landé factors for quantum point contacts: spin-orbit coupling and interaction effects
• Conductance quantization and shot noise of a double-layer quantum point contact
• Keldysh Derivation of Oguri's Linear Conductance Formula for Interacting Fermions