標題: Designing heterostructures with higher-temperature superconductivity
作者: Le Hur, Karyn
Chung, Chung-Hou
Paul, I.
電子物理學系
Department of Electrophysics
公開日期: 22-Jul-2011
摘要: We propose to increase the superconducting transition temperature T-c of strongly correlated materials by designing heterostructures which exhibit a high pairing energy as a result of magnetic fluctuations. More precisely, applying an effective theory of the doped Mott insulator, we envisage a bilayer Hubbard system where both layers exhibit intrinsic intralayer (intraband) d-wave superconducting correlations. Introducing a finite asymmetry between the hole densities of the two layers such that one layer becomes slightly more underdoped and the other more overdoped, we show a visible enhancement of T-c compared to the optimally doped isolated layer. Using the bonding and antibonding band basis, we show that the mechanism behind this enhancement of T-c is the interband pairing correlation mediated by the hole asymmetry which strives to decrease the paramagnetic nodal contribution to the superfluid stiffness. For two identical layers, T-c remains comparable to that of the isolated layer until moderate values of the interlayer single-particle tunneling term. These heterostructures shed new light on fundamental questions related to superconductivity.
URI: http://dx.doi.org/10.1103/PhysRevB.84.024526
http://hdl.handle.net/11536/21448
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.84.024526
期刊: PHYSICAL REVIEW B
Volume: 84
Issue: 2
起始頁: 0
結束頁: 0
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