Mott Insulating State in Ultraclean Carbon Nanotubes

被引：145

作者：

Deshpande, Vikram V. ^{[2
]}

Chandra, Bhupesh ^{[1
]}

Caldwell, Robert ^{[3
]}

Novikov, Dmitry S. ^{[4
]}

Hone, James ^{[1
]}

Bockrath, Marc ^{[2
]}

机构：

[1] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA

[2] CALTECH, Pasadena, CA 91125 USA

[3] Columbia Univ, Dept Appl Phys, New York, NY 10027 USA

[4] Yale Univ, Dept Phys, New Haven, CT 06511 USA

来源：

SCIENCE | 2009年 / 323卷 / 5910期

关键词：

TRANSPORT; GAPS;

D O I：

10.1126/science.1165799

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The Mott insulating state is a manifestation of strong electron interactions in nominally metallic systems. Using transport spectroscopy, we showed that an energy gap exists in nominally metallic carbon nanotubes and occurs in addition to the band gap in small- band- gap nanotubes, indicating that carbon nanotubes are never metallic. This gap has a magnitude of similar to 10 to 100 milli- electron volts and a nanotube radius ( r) dependence of similar to 1/r, which is in good agreement with predictions for a nanotube Mott insulating state. We also observed neutral excitations within the gap, as predicted for this state. Our results underscore nanotubes' exceptional capabilities for use in studying correlated electron phenomena in one dimension.

引用

页码：106 / 110

页数：5

共 28 条

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