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Volumn 78, Issue 12, 2008, Pages

Room-temperature superfluidity in graphene bilayers

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[No Author keywords available]

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EID: 51349118675     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.78.121401     Document Type: Article
Times cited : (383)

References (26)
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    • The nesting condition requires only that the Fermi surfaces be identical in area and shape and not that the two layers have aligned honeycomb lattices and hence aligned Brillouin zones. Global wave vector mismatches can be removed by gauge transformations. When weak inter-valley electron-electron scattering processes are included only simultaneous momentum shifts of both valleys in a layer are allowed. In this case relative rotations of the two layers will have a small influence on details of the paired state. Relative rotations will also help to reduce the amplitude of bare interlayer tunneling process which weaken transport anomalies as discussed in Ref.. For misaligned layers, bare tunneling could possibly be weak enough to produce interesting transport anomalies even for vertical transport between epilayers similar to those discussed by PRLTAO 0031-9007 10.1103/PhysRevLett.100.125504
    • The nesting condition requires only that the Fermi surfaces be identical in area and shape and not that the two layers have aligned honeycomb lattices and hence aligned Brillouin zones. Global wave vector mismatches can be removed by gauge transformations. When weak inter-valley electron-electron scattering processes are included only simultaneous momentum shifts of both valleys in a layer are allowed. In this case relative rotations of the two layers will have a small influence on details of the paired state. Relative rotations will also help to reduce the amplitude of bare interlayer tunneling process which weaken transport anomalies as discussed in Ref.. For misaligned layers, bare tunneling could possibly be weak enough to produce interesting transport anomalies even for vertical transport between epilayers similar to those discussed by J. Hass, F. Varchon, J. E. Millan-Otoya, M. Sprinkle, N. Sharma, W. A. de Heer, C. Berger, P. N. First, L. Magaud, and E. H. Conrad, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.100.125504 100, 125504 (2008).
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    • In separate calculations not described here we found that coherence between the two remote bands has little effect for kF d>1 and that will act to raise the KT temperature for kF d<1.
    • In separate calculations not described here we found that coherence between the two remote bands has little effect for kF d>1 and that will act to raise the KT temperature for kF d<1.
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    • In parabolic band systems this procedure provides a good estimate of the critical temperature in both the weak-coupling BCS and the strong-coupling BEC limits. Note, however, that because graphene is a gapless semiconductor, it does not have a simple BEC strong-coupling limit.
    • In parabolic band systems this procedure provides a good estimate of the critical temperature in both the weak-coupling BCS and the strong-coupling BEC limits. Note, however, that because graphene is a gapless semiconductor, it does not have a simple BEC strong-coupling limit.
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    • The unit contribution to the right-most square-bracket factor in Eq. 2 for Δkz is due to exchange interactions with the full valence band of the n -type layer.
    • The unit contribution to the right-most square-bracket factor in Eq. 2 for Δkz is due to exchange interactions with the full valence band of the n -type layer.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.