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아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.

4시 20분부터 제1과학관 31214 e+강의실에서 다과를 준비하오니 많은 참석 부탁드립니다


아 래


제목: Quantum Critical Superconductivity


연사: 박   두   선 교수님 (성균관대학교)


일시: 2013년 5월 15일(수) 오후4:30


장소: 제1과학관 31214  e+첨단강의실 


초록: Superconductivity (SC) is a remarkable realization of a macroscopic quantum state in the real world. Electrons are paired to coherently carry the current without resistance, and the quantum state is protected by formation of the superconducting gap. In conventional superconductors, the SC pairs are mediated by collective ionic motion or phonons and the SC order parameter (or the orbital wave-function of the pairs) is momentum independent (s-wave). Recently, new classes of unconventional superconductors have been discovered, where the SC order parameter is momentum dependent. This is highly suggestive of a completely different pairing mechanism, i.e., a non-phonon glue. The most well-known examples are high-Tc cuprates, organic superconductors, and heavy fermion superconductors, which are shown to have a d-wave pairing symmetry. Proximity of the unconventional superconductors to an antiferromagnetic ground state prompted a scenario that collective spin motion (spin waves), mediate the electron pairs and that the d-wave order parameter is a natural consequence of momentum dependent pairing interaction created by the spin waves. In this talk, we discuss recent progress in our understanding of unconventional superconductivity.

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