期刊
PHYSICAL REVIEW B
卷 89, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.184514
关键词
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资金
- FWO-V [G.0370.09N, G.0180.09N, G.0119.12N, G.0122.12N]
- WOG (Belgium) [WO.035.04N]
- SNSF [200020-140761]
- National Center of Competence in Research (NCCR) Materials with Novel Electronic Properties-MaNEP
- Swiss National Science Foundation (SNF) [200020_140761] Funding Source: Swiss National Science Foundation (SNF)
The interface superconductivity in LaAlO3-SrTiO3 heterostructures reveals a nonmonotonic behavior of the critical temperature as a function of the two-dimensional density of charge carriers. We develop a theoretical description of interface superconductivity in strongly polar heterostructures, based on the dielectric function formalism. The density dependence of the critical temperature is calculated, accounting for all phonon branches including different types of optical (interface and half-space) and acoustic phonons. The longitudinal-optic- and acoustic-phonon mediated electron-electron interaction is shown to be the dominating mechanism governing the superconducting phase transition in the heterostructure.
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