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Electronic properties of metal induced gap states at insulator/metal interfaces -- dependence on the alkali halide and the possibility of excitonic mechanism of superconductivity | | Ryotaro Arita
; Yoshiaki Tanida
; Kazuhiko Kuroki
; Hideo Aoki
; | | Date: |
8 Aug 2003 | | Subject: | Materials Science; Superconductivity | cond-mat.mtrl-sci cond-mat.supr-con | | Abstract: | Motivated from the experimental observation of metal induced gap states (MIGS) at insulator/metal interfaces by Kiguchi {it et al.} [Phys. Rev. Lett. {f 90}, 196803 (2003)], we have theoretically investigated the electronic properties of MIGS at interfaces between various alkali halides and a metal represented by a jellium with the first-principles density functional method. We have found that, on top of the usual evanescent state, MIGS generally have a long tail on halogen sites with a $p_z$-like character, whose penetration depth ($lambda$) is as large as half the lattice constant of bulk alkali halides. This implies that $lambda$, while little dependent on the carrier density in the jellium, is dominated by the lattice constant (hence by energy gap) of the alkali halide, where $lambda_{
m LiF} < lambda_{
m LiCl} < lambda_{
m LiI}$. We also propose a possibility of the MIGS working favorably for the exciton-mediated superconductivity. | | Source: | arXiv, cond-mat/0308155 | | Services: | Forum | Review | PDF | Favorites | |
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