Electric-field-induced superconductivity in an insulator

被引：859

作者：

Ueno, K. ^{[1
]}

Nakamura, S. ^{[2
]}

Shimotani, H. ^{[3
]}

Ohtomo, A. ^{[3
]}

Kimura, N. ^{[2
]}

Nojima, T. ^{[2
]}

Aoki, H. ^{[2
]}

Iwasa, Y. ^{[3
,4
]}

Kawasaki, M. ^{[1
,3
,4
]}

机构：

[1] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Ctr Low Temp Sci, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[4] Japan Sci & Technol Agcy, CREST, Tokyo 1020075, Japan

来源：

NATURE MATERIALS | 2008年 / 7卷 / 11期

关键词：

D O I：

10.1038/nmat2298

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electric field control of charge carrier density has long been a key technology to tune the physical properties of condensed matter, exploring the modern semiconductor industry. One of the big challenges is to increase the maximum attainable carrier density so that we can induce superconductivity in field-effect-transistor geometry. However, such experiments have so far been limited to modulation of the critical temperature in originally conducting samples because of dielectric breakdown(1-4). Here we report electric-field-induced superconductivity in an insulator by using an electric-double-layer gating in an organic electrolyte(5). Sheet carrier density was enhanced from zero to 10(14) cm(-2) by applying a gate voltage of up to 3.5V to a pristine SrTiO3 single-crystal channel. A two-dimensional superconducting state emerged below a critical temperature of 0.4 K, comparable to the maximum value for chemically doped bulk crystals(6), indicating this method as promising for searching for unprecedented superconducting states.

引用

页码：855 / 858

页数：4

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