Spin-orbit-driven electron pairing in two dimensions

Abstract

We show that the spin-orbit interaction (SOI) arising due to the in-plane electric field of the Coulomb repulsion between electrons in a two-dimensional quantum well produces an attractive component in the pair interaction Hamiltonian that depends on the spins and momenta of electrons. If the Rashba SOI constant of the material is high enough the attractive component overcomes the Coulomb repulsion and the centrifugal barrier, which leads to the formation of the two-electron bound states. There are two distinct types of two-electron bound states. The relative bound states are formed by the electrons orbiting around their common barycenter. They have the triplet spin structure and are independent of the center-of-mass momentum. In contrast, the convective bound states are formed because of the center-of-mass motion, which couples the electrons with opposite spins. The binding energy in the meV range is attainable for realistic conditions.

arXiv comment7 pages, 8 figures

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Cited by in corpus (15)

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• Electron correlations due to pair spin-orbit interaction in 2D electron systems
• Excitons and trions with negative effective masses in two-dimensional semiconductors
• Spin-orbit-assisted electron pairing in 1D waveguides
• Spin-dependent electron-electron interaction in Rashba materials
• Non-Relativistic and Relativistic Equations for the Kratzer Potential plus a Dipole in 2D Systems
• Electron pairs bound by the spin-orbit interaction in 2D gated Rashba materials with two-band spectrum
• Electron Interactions in Rashba Materials
• Exact Solutions for a Quantum Ring with a Dipolar Impurity
• Bound electron pairs formed by the spin-orbit interaction in 2D gated structures
• Radiative Decay of Bound Electron Pairs in Two-Dimensional Topological Insulators
• Radiative decay of bound electron pairs into unbound interacting electrons in 2D materials with two-band spectrum
• The Coulomb impurity in 2D materials with strong spin-orbit interaction
• Superfluid-insulator transition and the BEC-BCS crossover in the Rashba moat band