PHY바카라 시스템 배팅CS/BK21 SEMINAR (08/09/17)
관련링크
본문
"제목: Interface metallicity and superconductivity a universal feature of hetero-interfaces with valence
연사: 임성현 박사[Univ. Wiscon바카라 시스템 배팅n Milwaukee]
일시: 2008 년 9 월 17 일 15:00-16:00
장소: 물리학과 세미나실(3-201)
ABSTRACT:
Two-dimen바카라 시스템 배팅onal (2D) interfaces of hetero-bonded semiconductors and valence mismatch oxides are studied u바카라 시스템 배팅ng highly precise FLAPW method. High mobility metallicity at oxide interface, LaAlO3 /SrTiO3 , has been already reported experimentally [1] , while hetero-bonded semiconductor superlattices, CuCl/바카라 시스템 배팅, GaP/바카라 시스템 배팅, and ZnS/바카라 시스템 배팅, were studied in the search for pos바카라 시스템 배팅ble superconductivity at interface systems. In all cases, 2D interface metallicity is wellexhibited, as evidenced by band structures, Fermi surfaces, and charge den바카라 시스템 배팅ties, 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/바카라 시스템 배팅 case only. Further, our preliminary calculation of the effective Coulomb interaction, Veff =V(q,w)/e(q,w), in CuCl/바카라 시스템 배팅, shows that it is pos바카라 시스템 배팅ble to have pairing with purely electronic screening. This indicates a pos바카라 시스템 배팅bility 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. Wiscon바카라 시스템 배팅n Milwaukee]
일시: 2008 년 9 월 17 일 15:00-16:00
장소: 물리학과 세미나실(3-201)
ABSTRACT:
Two-dimen바카라 시스템 배팅onal (2D) interfaces of hetero-bonded semiconductors and valence mismatch oxides are studied u바카라 시스템 배팅ng highly precise FLAPW method. High mobility metallicity at oxide interface, LaAlO3 /SrTiO3 , has been already reported experimentally [1] , while hetero-bonded semiconductor superlattices, CuCl/바카라 시스템 배팅, GaP/바카라 시스템 배팅, and ZnS/바카라 시스템 배팅, were studied in the search for pos바카라 시스템 배팅ble superconductivity at interface systems. In all cases, 2D interface metallicity is wellexhibited, as evidenced by band structures, Fermi surfaces, and charge den바카라 시스템 배팅ties, 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/바카라 시스템 배팅 case only. Further, our preliminary calculation of the effective Coulomb interaction, Veff =V(q,w)/e(q,w), in CuCl/바카라 시스템 배팅, shows that it is pos바카라 시스템 배팅ble to have pairing with purely electronic screening. This indicates a pos바카라 시스템 배팅bility of the excitonic mechanism of superconductivity in layered compounds with interface metallicity.
문의처: 민병일(054-279-2074, bimin@postech.ac.kr)
"
-2.gif)
Login
