Spin Texture in Quantum Point Contacts in the Presence of Lateral Spin Orbit Coupling

Details Spin Texture in Quantum Point Contacts in the Presence of Lateral Spin Orbit Coupling Spin Texture in Quantum Point Contacts in the Presence of Lateral Spin Orbit Coupling

2010-09-30

arxiv.org/abs/1009.6211v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

26 pages, 8 figures

Scientific paper

A non-equilibrium Green's function formalism is used to study in detail the ballistic conductance of asymmetrically biased side-gated quantum point contacts (QPCs) in the presence of lateral spin-orbit coupling and electron-electron interaction for a wide range of QPC dimensions and gate bias voltage. Various conductance anomalies are predicted below the first quantized conductance plateau (G0=2e2/h) which occur due to spontaneous spin polarization in the narrowest portion of the QPC. The number of observed conductance anomalies increases with increasing aspect ratio (length/width) of the QPC constriction. These anomalies are fingerprints of spin textures in the narrow portion of the QPC.

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