Tunnel spectroscopy of localised electronic states in hexagonal boron nitride

被引：48

作者：

Greenaway, M. T. ^{[1
,2
]}

Vdovin, E. E. ^{[1
,3
]}

Ghazaryan, D. ^{[4
]}

Misra, A. ^{[4
]}

Mishchenko, A. ^{[4
]}

Cao, Y. ^{[5
]}

Wang, Z. ^{[4
]}

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

Holwill, M. ^{[5
]}

Khanin, Yu N. ^{[3
]}

Morozov, S., V ^{[3
,6
]}

Watanabe, K. ^{[7
]}

Taniguchi, T. ^{[7
]}

Makaroysky, O. ^{[1
]}

Fromhold, T. M. ^{[1
]}

Patane, A. ^{[1
]}

Geim, A. K. ^{[4
,5
]}

Fal'ko, V., I ^{[5
]}

Novoselov, K. S. ^{[4
,5
]}

Eaves, L. ^{[1
,4
]}

机构：

[1] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[2] Loughborough Univ, Dept Phys, Loughborough LE11 3TU, Leics, England

[3] RAS, Inst Microelect Technol & High Pur Mat, Chernogolovka 142432, Russia

[4] Univ Manchester, Sch Phys & Astron, Manchester M13 9PL, Lancs, England

[5] Univ Manchester, Natl Graphene Inst, Manchester M13 9PL, Lancs, England

[6] Natl Univ Sci & Technol MISiS, Leninsky Pr 4, Moscow 119049, Russia

[7] Natl Inst Mat Sci, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan

来源：

COMMUNICATIONS PHYSICS | 2018年 / 1卷

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会; 俄罗斯科学基金会;

关键词：

SINGLE-PHOTON EMISSION; QUANTUM EMITTERS; POINT-DEFECTS; GRAPHENE; CRYSTALS;

D O I：

10.1038/s42005-018-0097-1

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Hexagonal boron nitride is a large band gap layered crystal, frequently incorporated in van der Waals heterostructures as an insulating or tunnel barrier. Localised states with energies within its band gap can emit visible light, relevant to applications in nanophotonics and quantum information processing. However, they also give rise to conducting channels, which can induce electrical breakdown when a large voltage is applied. Here we use gated tunnel transistors to study resonant electron tunnelling through the localised states in few atomic-layer boron nitride barriers sandwiched between two monolayer graphene electrodes. The measurements are used to determine the energy, linewidth, tunnelling transmission probability, and depth within the barrier of more than 50 distinct localised states. A three-step process of electron percolation through two spatially separated localised states is also investigated.

引用

页数：7

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