史俊杰
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论文成果
Anomalous Pressure Characteristics of Defects in Hexagonal Boron Nitride Flakes
发布时间：2020-06-02点击次数：
影响因子：
13.903
发表刊物：
ACS Nano
关键字：
hexagonal boron nitride flakes, single photon emissions, deep-level defects, photoluminescence, hydrostatic pressure
摘要：
Research on hexagonal boron nitride (hBN) has been intensified recently due to the application of hBN as a promising system
of single-photon emitters. To date, the single photon origin remains under debate even though many experiments and theoretical calculations have been performed. We have measured the pressure-dependent photoluminescence (PL) spectra of hBN flakes at low temperatures by using a diamond anvil cell device. The absolute values of the pressure coefficients of discrete PL emission lines are all below 15 meV/GPa, which is much lower
than the pressure-induced 36 meV/GPa redshift rate of the hBN bandgap. These PL emission lines originate from atom-like localized defect levels confined within the bandgap of the hBN flakes. Interestingly, the experimental results of the pressure-dependent PL emission lines present three different types of pressure responses corresponding to a redshift (negative pressure coefficient), a blueshift (positive pressure coefficient), or even a sign change from negative to positive. Density functional theory calculations indicate the existence of competition between the intralayer and interlayer interaction contributions, which leads to the different pressure-dependent behaviors of the PL peak shift.
论文类型：
期刊论文
学科门类：
理学
一级学科：
物理学
卷号：
12
页面范围：
7127−7133
是否译文：
否
发表时间：
2018-06-29
收录刊物：
SCI
附件：
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