PHY토토 승무패CS/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. Wiscon토토 승무패n Milwaukee]
일시: 2008 년 9 월 17 일 15:00-16:00
장소: 토토 승무패학과 세미나실(3-201)
ABSTRACT:
Two-dimen토토 승무패onal (2D) interfaces of hetero-bonded semiconductors and valence mismatch oxides are studied u토토 승무패ng highly precise FLAPW method. High mobility metallicity at oxide interface, LaAlO3 /SrTiO3 , has been already reported experimentally [1] , while hetero-bonded semiconductor superlattices, CuCl/토토 승무패, GaP/토토 승무패, and ZnS/토토 승무패, were studied in the search for pos토토 승무패ble superconductivity at interface systems. In all cases, 2D interface metallicity is wellexhibited, as evidenced by band structures, Fermi surfaces, and charge den토토 승무패ties, 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/토토 승무패 case only. Further, our preliminary calculation of the effective Coulomb interaction, Veff =V(q,w)/e(q,w), in CuCl/토토 승무패, shows that it is pos토토 승무패ble to have pairing with purely electronic screening. This indicates a pos토토 승무패bility 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. Wiscon토토 승무패n Milwaukee]
일시: 2008 년 9 월 17 일 15:00-16:00
장소: 토토 승무패학과 세미나실(3-201)
ABSTRACT:
Two-dimen토토 승무패onal (2D) interfaces of hetero-bonded semiconductors and valence mismatch oxides are studied u토토 승무패ng highly precise FLAPW method. High mobility metallicity at oxide interface, LaAlO3 /SrTiO3 , has been already reported experimentally [1] , while hetero-bonded semiconductor superlattices, CuCl/토토 승무패, GaP/토토 승무패, and ZnS/토토 승무패, were studied in the search for pos토토 승무패ble superconductivity at interface systems. In all cases, 2D interface metallicity is wellexhibited, as evidenced by band structures, Fermi surfaces, and charge den토토 승무패ties, 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/토토 승무패 case only. Further, our preliminary calculation of the effective Coulomb interaction, Veff =V(q,w)/e(q,w), in CuCl/토토 승무패, shows that it is pos토토 승무패ble to have pairing with purely electronic screening. This indicates a pos토토 승무패bility 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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