Superconductor-Insulator Transitions in Exfoliated Bi2Sr2CaCu2O8+δ Flakes

被引：71

作者：

Liao, Menghan ^{[1
,2
]}

Zhu, Yuying ^{[1
,2
]}

Zhang, Jin ^{[1
,2
]}

Zhong, Ruidan ^{[3
]}

Schneeloch, John ^{[3
,4
]}

Gu, Genda ^{[3
]}

Jiang, Kaili ^{[1
,2
,5
,6
]}

Zhang, Ding ^{[1
,2
,6
]}

Ma, Xucun ^{[1
,2
,6
]}

Xue, Qi-Kun ^{[1
,2
,6
]}

机构：

[1] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[3] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[4] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[5] Tsinghua Univ, Tsinghua Foxconn Nanotechnol Res Ctr, Beijing 100084, Peoples R China

[6] Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China

来源：

NANO LETTERS | 2018年 / 18卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Bi2Sr2CaCu2O8+delta flakes; solid ion conductor; superconductor-insulator transition; lithium intercalation; tunneling spectroscopy; HIGH-TEMPERATURE SUPERCONDUCTORS; VACUUM TUNNELING SPECTROSCOPY; MOTT INSULATOR; DENSITY; EVOLUTION; STATES; FILMS;

D O I：

10.1021/acs.nanolett.8b02183

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We realize superconductor-insulator transitions (SIT) in mechanically exfoliated Bi2Sr2CaCu2O8+delta (BSCCO) flakes and address simultaneously their transport properties as well as the evolution of density of states. Back-gating via the solid ion conductor (SIC) engenders a SIT in BSCCO due to the modulation of carrier density by intercalated lithium ions. Scaling analysis indicates that the SIT follows the theoretical description of a two-dimensional quantum phase transition (2D-QPT). We further carry out tunneling spectroscopy in graphite(G)/BSCCO heterojunctions. We observe V-shaped gaps in the critical regime of the SIT. The density of states in BSCCO gets symmetrically suppressed by further going into the insulating regime. Our technique of combining solid state gating with tunneling spectroscopy can be easily applied to the study of other two-dimensional materials.

引用

页码：5660 / 5665

页数：6

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