Quasiparticle density of state in d-wave superconducting superlattice systems

Huang, Bor-Luen; Mou, Chung‐Yu

doi:10.1016/s0921-4534(03)00698-1

Cited by 1 publication

(2 citation statements)

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“…Quasicontinuum of energy states corresponding to the crystal momentum within the first Brillouin zone, K ∈ (−π/a, π/a), is indicated by shading the band width calculated from Eqs. (13) and (14).…”

Section: Energy Bands and Density Of Statesmentioning

confidence: 99%

“…The artificial S/N superlattices consisting of alternating superconductor (S) and normal-metal or semiconductor (N) layers have been studied for some time already [1,2,3,4,5,6,7,8,9], see also [10,11]. The recent advancement of nanofabrication technology and experimental techniques [12], as well as intrinsically layered structure of high-T c superconductors [13,14,15] has reinvigorated the long standing interest in understanding the effects inherent to clean superconducting heterostructures [16,17,18]. The size and coherence effects have been studied recently for double barrier SNS and NSN junctions in the clean limit based on the solutions of Gor'kov and Bogoliubov-de Gennes (BdG) equations [19,20,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

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Quasiparticle states in superconducting superlattices

Vanevic

Radović

2005

Eur. Phys. J. B

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The energy bands and the global density of states are computed for superconductor / normalmetal superlattices in the clean limit. Dispersion relations are derived for the general case of insulating interfaces, including the mismatch of Fermi velocities and effective band masses. We focus on the influence of finite interface transparency and compare our results with those for transparent superlattices and trilayers. Analogously to the rapid variation on the atomic scale of the energy dispersion with layer thicknesses in transparent superlattices, we find strong oscillations of the almost flat energy bands (transmission resonances) in the case of finite transparency. In small-period transparent superlattices the BCS coherence peak disappears and a similar subgap peak is formed due to the Andreev process. With decreasing interface transparency the characteristic double peak structure in the global density of states develops towards a gapless BCS-like result in the tunnel limit. This effect can be used as a reliable STM probe for interface transparency.PACS. 74.45.+c Proximity effects; Andreev effect; SN and SNS junctions

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Section: Energy Bands and Density Of Statesmentioning

confidence: 99%