Microscopic Theory of Cooper-pair fluctuations in a 2D Electron System with Strong Spin-Orbit Scatterings: Crossover to Phase Separation and Large Magnetoresistance
| Autor: | Maniv, Tsofar, Zhuravlev, Vladimir |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | A microscopic theory of Cooper-pair fluctuations (CPFs) in a 2D electron system with strong spin-orbit scatterings is presented to account for the observation, at low temperatures, of large magnetoresistance (MR) above a crossover field to superconductivity in electron-doped SrTiO$_{3}$/LaAlO$_{3} $ interfaces. It is found that the conventional (diagrammatic) microscopic theory of superconducting fluctuations yields corrections to the normal-state conductivity too small to account for the pronounced MR. However, an extension of the theory, which introduces a proper definition of the CPFs density, reveals an operative mechanism of this intriguing large MR. A crossover to phase separation, due to Coulomb repulsion, between the rarefying unpaired normal-state electron gas and condensates of CPFs in real-space mesoscopic puddles, developed under increasing field, drive a crossover to a large MR. In the framework of this scenario it is possible to amend the state-of-the-art microscopic theory consistently with the time dependent Ginzburg-Landau functional approach, used previously in an extensive account of the experimentally reported effect. Comment: 21 pages, 4 figures |
| Databáze: | arXiv |
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