Giovanni Sordi Kristjan Haule Strongly correlated … · 2012-03-03 · Strongly correlated...
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Strongly correlated superconductivityand Mott transition
André-Marie TremblayAbstract: B23.00004 :
arXiv:1201.128311:51 AM–12:03 PM
Room: 255
André-Marie TremblayAbstract: B23.00004 :
arXiv:1201.128311:51 AM–12:03 PM
Room: 255
Giovanni SordiGiovanni SordiGiovanni Sordi Kristjan HauleKristjan HauleKristjan HaulePatrick SémonPatrick Sémon
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D-wave superconductivity in the one-band Hubbard model
tU
t’t’’
H −∑ij t i,j ci cj cj
ci U∑ i ni↑ni↓H −∑ij t i,j ci cj cj
ci U∑ i ni↑ni↓
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d-wave superconductivity
• Weak coupling– C. J. Halboth and W. Metzner, Phys. Rev. Lett. 85, 5162 (2000).– B. Kyung, J.-S. Landry, and A. M. S. Tremblay, Phys. Rev. B 68, 174502 (2003).– C. Bourbonnais and A. Sedeki, Physical Review B 80, 085105 (2009).– D. J. Scalapino, Physica C: Superconductivity 470, Supplement 1, S1 (2010), ISSN 0921-4534,
proceedings of the 9th International Conference on Materials and Mech anisms of Superconductivity.
• Renormalized Mean-Field Theory– P. W. Anderson, P. A. Lee, M. Randeria, T. M. Rice, N. Trivedi, and F. C. Zhang, Journal of Physics:
Condensed Matter 16, R755 (2004).– K.-Y. Yang, T. M. Rice, and F.-C. Zhang, Phys. Rev. B 73, 174501 (2006).
• Slave particles– P. A. Lee, N. Nagaosa, and X.-G. Wen, Rev. Mod. Phys. 78, 17 (2006).– M. Imada, Y. Yamaji, S. Sakai, and Y. Motome, Annalen der Physik 523, 629 (2011)
• Variational approaches– T. Giamarchi and C. Lhuillier, Phys. Rev. B 43, 12943 (1991).– A. Paramekanti, M. Randeria, and N. Trivedi, Phys. Rev. B 70, 054504 (2004).
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Method
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DCA
2d Hubbard: Cluster gen. of DMFT
C-DMFTV-
DCA
Hettler …Jarrell…Krishnamurty PRB 58 (1998)Kotliar et al. PRL 87 (2001)M. Potthoff et al. PRL 91, 206402 (2003).Maier, Jarrell et al., Rev. Mod. Phys. 77, 1027 (2005)
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T = 0 results
Will comment on finite T results later
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C-DMFT
K
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What does the method tell us: example athalf-filling
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Local moment and Mott transition
T
U
n = 1, unfrustrated square lattice
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Local moment and Mott transition
T
U
n = 1, unfrustrated square lattice
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Momentum resolution with 4 sites
B. Kyung, S. Kancharla, D. Sénéchal, A.-M.S. Tremblay, M. Civelli, G. Kotliar, Phys. Rev. B 73, 165114 (2006).
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Local moment and Mott transition
T
U
n = 1, unfrustrated square lattice
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Mott transition
T
U
n = 1, frustrated lattice
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Normal state finite T phase diagram
Giovanni Sordi: Wednesday 9:36 AM P54.00009
Giovanni SordiGiovanni SordiGiovanni Sordi
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Link to Mott transition up to optimal doping
Doping dependence of critical point as a function of U
H. Park, K. Haule, and G. Kotliar PRL 101, 186403 (2008)
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Normal state U=6.2t
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Superconductivity(when AFM not permitted)
arXiv:1201.1283v1
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Order parameter as a function of doping, T fixed
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Order parameter as a function of doping, T fixed
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What makes Tc fall ?
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Meaning of Tcd
• Local pair formation
K. K. Gomes, A. N. Pasupathy, A. Pushp, S. Ono, Y. Ando, and A. Yazdani,
Nature 447, 569 (2007)
F. Rullier-Albenque, H. Alloul, and G.Rikken, Phys. Rev. B 84, 014522 (2011).
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Avoided first-order transition leaves its mark
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Bandwidth vs doping driven transition
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Cuprates vs organics
40
30
20
10
0
T
(K)
6004002000
P (bar)
AF
U-SCAF/SC
PI
M
Armitage, Fournier, Greene, RMP (2009)
Phase diagram (X=Cu[N(CN)2]Cl)S. Lefebvre et al. PRL 85, 5420 (2000), P. Limelette, et al. PRL 91 (2003)F. Kagawa, K. Miyagawa, + K. KanodaPRB 69 (2004) +Nature 436 (2005)
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Normal state Mott transition, n = 1
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Normal state Mott transition
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Unified phase diagram
• Normal-state metalclose to Mott insulatoris unstable to SC atany filling
• The SC phase iscontinuouslyconnected acrossdopings.
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• Tcd ≠ T*
• Tcd does not vanish as
– Mott physics alone does not suppress Tc
– SC fluctuations left
• First-order transition in normal state is removed by SC but leaves its mark on the dynamics.
Our contributions for the doped case
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C’est fini…