Nature of the quantum metal in a two-dimensional crystalline superconductor

被引：281

作者：

Tsen, A. W. ^{[1
]}

Hunt, B. ^{[1
,7
]}

Kim, Y. D. ^{[2
]}

Yuan, Z. J. ^{[3
]}

Jia, S. ^{[3
,4
]}

Cava, R. J. ^{[5
]}

Hone, J. ^{[2
]}

Kim, P. ^{[6
]}

Dean, C. R. ^{[1
]}

Pasupathy, A. N. ^{[1
]}

机构：

[1] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

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

[3] Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China

[4] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

[5] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[6] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[7] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

来源：

NATURE PHYSICS | 2016年 / 12卷 / 03期

基金：

美国国家科学基金会;

关键词：

BOSE METAL; INSULATOR TRANSITION; PHASE-TRANSITIONS; STATE; FLUCTUATIONS; TRANSPORT; FILMS;

D O I：

10.1038/NPHYS3579

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Two-dimensional (2D) materials are not expected to be metals at low temperature owing to electron localization(1). Consistent with this, pioneering studies on thin films reported only superconducting and insulating ground states, with a direct transition between the two as a function of disorder or magnetic field(2-6). However, more recent works have revealed the presence of an intermediate quantum metallic state occupying a substantial region of the phase diagram(7-10), whose nature is intensely debated(11-17). Here, we observe such a state in the disorder-free limit of a crystalline 2D superconductor, produced by mechanical co-lamination of NbSe2 in an inert atmosphere. Under a small perpendicular magnetic field, we induce a transition from superconductor to the quantum metal. We find a unique power-law scaling with field in this phase, which is consistent with the Bose-metal model where metallic behaviour arises from strong phase fluctuations caused by the magnetic field(11-14).

引用

页码：208 / +

页数：6

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