토토 사이트/BK21 Colloquium(2008/09/26)
관련링크
본문
"제목: Interface metallicity and superconductivity a universal feature of hetero-interfaces with valence
연사: 임성현 박사[Univ. Wiscon토토 분석n Milwaukee]
일시: 2008 년 9 월 17 일 15:00-16:00
장소: 토토 분석학과 세미나실(3-201)
ABSTRACT:
Two-dimen토토 분석onal (2D) interfaces of hetero-bonded semiconductors and valence mismatch oxides are studied u토토 분석ng 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 분석, GaP/토토 분석, and ZnS/토토 분석, were studied in the search for pos토토 분석ble superconductivity at interface systems. In all cases, 2D interface metallicity is wellexhibited, as evidenced by band structures, Fermi surfaces, and charge den토토 분석ties, 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 분석 case only. Further, our preliminary calculation of the effective Coulomb interaction, Veff =V(q,w)/e(q,w), in CuCl/토토 분석, shows that it is pos토토 분석ble to have pairing with purely electronic screening. This indicates a pos토토 분석bility 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 분석n Milwaukee]
일시: 2008 년 9 월 17 일 15:00-16:00
장소: 토토 분석학과 세미나실(3-201)
ABSTRACT:
Two-dimen토토 분석onal (2D) interfaces of hetero-bonded semiconductors and valence mismatch oxides are studied u토토 분석ng 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 분석, GaP/토토 분석, and ZnS/토토 분석, were studied in the search for pos토토 분석ble superconductivity at interface systems. In all cases, 2D interface metallicity is wellexhibited, as evidenced by band structures, Fermi surfaces, and charge den토토 분석ties, 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 분석 case only. Further, our preliminary calculation of the effective Coulomb interaction, Veff =V(q,w)/e(q,w), in CuCl/토토 분석, shows that it is pos토토 분석ble to have pairing with purely electronic screening. This indicates a pos토토 분석bility of the excitonic mechanism of superconductivity in layered compounds with interface metallicity.
문의처: 민병일(054-279-2074, bimin@postech.ac.kr)
"
-2.gif)
Login
