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Japanese | English (Top page)
๚: | ฝฌ29N516๚(ฮ) 14:30`15:30 |
Date and time: | 16th May (Tue.) 14:30-15:30 |
๊: | SPring-8, G๕ู |
Place: | SPring-8, "HOUKOUKAN" seminar room |
่ผ: | fCbNdqnษจฏ้ผเฎ-ด`ฑ]ฺฬสqีEซ |
Title: | Quantum criticality of semimetal-superconductor phase transition in Dirac fermions |
uา: | ๅหY๊@@iRs [^[Z^[j |
Speaker: | Dr. Yuichi Otsuka (K-Computer Center) |
Abstract: |
We investigate a semimetal-superconductor phase transition of Dirac fermions by means of large-scale QMC simulations for the attractive Hubbard model on the triangular lattice, in which alternating magnetic π-flux is introduced to construct the linear dispersion of the Dirac fermions. This phase transition is expected to correspond to the chiral-XY class in the framework of the Gross-Neveu model, where an order parameter breaking the U(1) symmetry brings about the chiral-symmetry breaking and hence a mass gap. We calculate the order parameter of the s-wave superconductivity on large clusters with more than 1,600 lattice sites and obtain the critical exponents of the transition.
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Organizers: |
Toru Sakai(University of Hyogo, QST SPring-8) Kenji Tsutsui(QST Pring-8) Hiroki Nakano(University of Hyogo) |