PHY검증 바카라CS/BK21 SEMINAR (08/09/17)
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"제목: Interface metallicity and superconductivity a universal feature of hetero-interfaces with valence
연사: 임성현 박사[Univ. Wiscon검증 바카라n Milwaukee]
일시: 2008 년 9 월 17 일 15:00-16:00
장소: 물리학과 세미나실(3-201)
ABSTRACT:
Two-dimen검증 바카라onal (2D) interfaces of hetero-bonded semiconductors and valence mismatch oxides are studied u검증 바카라ng highly precise FLAPW method. High mobility metallicity at oxide interface, LaAlO3 /SrTiO3 , has been already reported experimentally [1] , while hetero-bonded semiconductor superlattices, CuCl/검증 바카라, GaP/검증 바카라, and ZnS/검증 바카라, were studied in the search for pos검증 바카라ble superconductivity at interface systems. In all cases, 2D interface metallicity is wellexhibited, as evidenced by band structures, Fermi surfaces, and charge den검증 바카라ties, where all materials are insulators in their bulk. [2] The above superlattices are reminiscence of ``metal-dielectric-metal sandwich structures, one of the candidate geometries for excitonic mediation, proposed by Little [3] and Ginzburg [4]. For this, the electron-phonon coupling is calculated within the crude rigid muffin-tin approximation (RMTA), which predicts TC=0.06~4 K for CuCl/검증 바카라 case only. Further, our preliminary calculation of the effective Coulomb interaction, Veff =V(q,w)/e(q,w), in CuCl/검증 바카라, shows that it is pos검증 바카라ble to have pairing with purely electronic screening. This indicates a pos검증 바카라bility of the excitonic mechanism of superconductivity in layered compounds with interface metallicity.
문의처: 민병일(054-279-2074, bimin@postech.ac.kr)
"
연사: 임성현 박사[Univ. Wiscon검증 바카라n Milwaukee]
일시: 2008 년 9 월 17 일 15:00-16:00
장소: 물리학과 세미나실(3-201)
ABSTRACT:
Two-dimen검증 바카라onal (2D) interfaces of hetero-bonded semiconductors and valence mismatch oxides are studied u검증 바카라ng highly precise FLAPW method. High mobility metallicity at oxide interface, LaAlO3 /SrTiO3 , has been already reported experimentally [1] , while hetero-bonded semiconductor superlattices, CuCl/검증 바카라, GaP/검증 바카라, and ZnS/검증 바카라, were studied in the search for pos검증 바카라ble superconductivity at interface systems. In all cases, 2D interface metallicity is wellexhibited, as evidenced by band structures, Fermi surfaces, and charge den검증 바카라ties, where all materials are insulators in their bulk. [2] The above superlattices are reminiscence of ``metal-dielectric-metal sandwich structures, one of the candidate geometries for excitonic mediation, proposed by Little [3] and Ginzburg [4]. For this, the electron-phonon coupling is calculated within the crude rigid muffin-tin approximation (RMTA), which predicts TC=0.06~4 K for CuCl/검증 바카라 case only. Further, our preliminary calculation of the effective Coulomb interaction, Veff =V(q,w)/e(q,w), in CuCl/검증 바카라, shows that it is pos검증 바카라ble to have pairing with purely electronic screening. This indicates a pos검증 바카라bility of the excitonic mechanism of superconductivity in layered compounds with interface metallicity.
문의처: 민병일(054-279-2074, bimin@postech.ac.kr)
"
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