原子级薄碳膜中的电场效应。

Electric field effect in atomically thin carbon films.

作者信息

Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A

机构信息

Department of Physics, University of Manchester, Manchester M13 9PL, UK.

出版信息

Science. 2004 Oct 22;306(5696):666-9. doi: 10.1126/science.1102896.

DOI:10.1126/science.1102896

PMID:15499015

Abstract

We describe monocrystalline graphitic films, which are a few atoms thick but are nonetheless stable under ambient conditions, metallic, and of remarkably high quality. The films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands, and they exhibit a strong ambipolar electric field effect such that electrons and holes in concentrations up to 10(13) per square centimeter and with room-temperature mobilities of approximately 10,000 square centimeters per volt-second can be induced by applying gate voltage.

摘要

我们描述了一种单晶石墨薄膜，它只有几个原子厚，但在环境条件下却很稳定，具有金属特性且质量极高。研究发现，这种薄膜是一种二维半金属，其价带和导带之间存在微小重叠，并且表现出强烈的双极性电场效应，即通过施加栅极电压，可以诱导出浓度高达每平方厘米10¹³个的电子和空穴，其室温迁移率约为每伏秒10000平方厘米。