Coulomb-exchange effects in nanowires with spin splitting due to a radial electric field
arXiv:1503.05627 · doi:10.1103/PhysRevB.92.115414
Abstract
We present a theoretical study of Coulomb exchange interaction for electrons confined in a cylindrical quantum wire and subject to a Rashba-type spin-orbit coupling with radial electric field. The effect of spin splitting on the single-particle band dispersions, the quasiparticle effective mass, and the system's total exchange energy per particle are discussed. Exchange interaction generally suppresses the quasiparticle effective mass in the lowest nanowire subband, and a finite spin splitting is found to significantly increase the magnitude of the quasiparticle-mass suppression (by upto 15\% in the experimentally relevant parameter regime). In contrast, spin-orbit coupling causes a modest (1\%-level) reduction of the magnitude of the exchange energy per particle. Our results shed new light on the interplay of spin-orbit coupling and Coulomb interaction in quantum-confined systems, including those that are expected to host exotic quasiparticle excitations.
9 pages, 8 figures; v2 includes new results for the quasiparticle effective mass (to appear in Phys. Rev. B)
References in corpus (10)
- Transition from fractional to Majorana fermions in Rashba nanowires
- Spin-orbit interaction in InSb nanowires
- Competing effects of interactions and spin-orbit coupling in a quantum wire
- Screening properties of the two-dimensional electron gas with spin-orbit coupling
- Plasmon mass and Drude weight in strongly spin-orbit-coupled 2D electron gases
- Low-energy theory and RKKY interaction for interacting quantum wires with Rashba spin-orbit coupling
- Theoretical study of interacting hole gas in p-doped bulk III-V semiconductors
- Exchange energy and generalized polarization in the presence of spin-orbit coupling in two dimensions
- Strongly Interacting Holes in Ge/Si Nanowires
- Plasmons in spin-orbit coupled two-dimensional hole gas systems