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: 22-七月-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
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