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Competing superconducting phases in the interacting two-dimensional electron gas with strong Rashba spin-orbit coupling

Ghadimi, R ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevB.99.115122
  3. Publisher: American Physical Society , 2019
  4. Abstract:
  5. In this work, we study interacting electrons on a square lattice in the presence of strong Rashba spin-orbit interaction. The spin-orbit term forces the time-reversal electron states to be paired in even Cooper channels. For concreteness, we only consider the repulsive onsite Hubbard and nearest-neighbor Coulomb interactions, the so-called extended Hubbard model. To examine the superconducting instability, we obtain the effective interaction between electrons within the random phase approximation and treat the pairing instabilities driven by charge and spin fluctuations and their combined effects. We mapped out the phase diagram of the model in terms of interactions and electron fillings and found that while the dxy and dx2-y2 symmetries are the most likely pairing symmetries driven by charge and spin fluctuations, respectively, the strong effect of both fluctuations yields higher angular momentum Cooper instabilities. The possibility of topological superconductivity and triplet pairing is also discussed
  6. Keywords:
  7. Approximation algorithms ; Electron gas ; Electrons ; Spin fluctuations ; Effective interactions ; Extended Hubbard model ; Interacting electrons ; Pairing instability ; Random phase approximations ; Rashba spin orbit interaction ; Rashba spin-orbit coupling ; Super conducting phasis ; Two dimensional electron gas
  8. Source: Physical Review B ; Volume 99, Issue 11 , 2019 ; 24699950 (ISSN)
  9. URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.115122