Electric field effect on superconductivity in atomically thin flakes of NbSe2

被引：169

作者：

Staley, Neal E. ^{[1
]}

Wu, Jian ^{[1
]}

Eklund, Peter ^{[1
]}

Liu, Ying ^{[1
]}

Li, Linjun ^{[2
]}

Xu, Zhuan ^{[2
]}

机构：

[1] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[2] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 18期

关键词：

BCS theory; electric field effects; niobium compounds; superconducting materials; superconducting thin films; superconducting transition temperature; FERMI-SURFACE; INSULATOR TRANSITION; FILMS; 2H-NBSE2; STATE; TEMPERATURE; CONDUCTIVITY; GRAPHENE; RAMAN;

D O I：

10.1103/PhysRevB.80.184505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We studied the electric field effect on superconductivity in atomically thin flakes of NbSe2 prepared by mechanical exfoliation. We found that these NbSe2 flakes are superconducting down to a thickness of a single unit cell consisting of two molecular layers of NbSe2 with an onset superconducting transition temperature (T-c) up to 2.5 K. We demonstrated that the T-c of the thinnest flakes can be modulated by an applied gate voltage with a T-c shift as large as 200 mK, which is larger than expected from a simple consideration based on Bardeen-Cooper-Schrieffer theory. We discuss the possible reasons for the observed enhanced electric field modulation of T-c.

引用

页数：6

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