Midgap radiative centers in carbon-enriched hexagonal boron nitride

被引:40
|
作者
Koperski, Maciej [1 ]
Vaclavkova, Diana [2 ]
Watanabe, Kenji [3 ]
Taniguchi, Takashi [4 ]
Novoselov, Kostya S. [1 ]
Potemski, Marek [2 ,5 ]
机构
[1] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117575, Singapore
[2] Univ Grenoble Alpes, Univ Paul Sabatier, Lab Natl Champs Magnet Intenses,CNRS, Inst Natl Sci Appl Toulouse,European Magnet Field, F-38042 Grenoble, France
[3] Natl Inst Mat Sci, Res Ctr Funct Mat, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan
[4] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan
[5] Univ Warsaw, Inst Expt Phys, Fac Phys, PL-02093 Warsaw, Poland
基金
日本科学技术振兴机构; 英国工程与自然科学研究理事会;
关键词
hexagonal boron nitride; defects; midgap centers; single-photon emitters; TEMPERATURE-DEPENDENCE; QUANTUM EMISSION; LINE; FLUORESCENCE; DIAMOND; SPECTRA; RUBY; INTERFERENCE; PRESSURE; CRYSTALS;
D O I
10.1073/pnas.2003895117
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
When serving as a protection tissue and/or inducing a periodic lateral modulation for/in atomically thin crystals, hexagonal boron nitride (hBN) has revolutionized the research on van der Waals heterostructures. By itself, hBN appears as an emergent widebandgap material, which, importantly, can be optically bright in the far-ultraviolet range and which frequently displays midgap defect-related centers of yet-unclear origin, but, interestingly, acting as single-photon emitters. Controlling the hBN doping is of particular interest in view of the possible practical use of this material. Here, we demonstrate that enriching hBN with carbon (C) activates an optical response of this material in the form of a series of well-defined resonances in visible and near-infrared regions, which appear in the luminescence spectra measured under below-bandgap excitation. Two, qualitatively different, C-related radiative centers are identified: One follows the Franck-Condon principle that describes transitions between two defect states with emission/annihilation of optical phonons, and the other shows atomic-like resonances characteristic of intradefect transitions. With a detailed characterization of the energy structure and emission dynamics of these radiative centers, we contribute to the development of controlled doping of hBN with midgap centers.
引用
收藏
页码:13214 / 13219
页数:6
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