论文标题
六角形硼化硼的颜色中心电荷状态的光学控制
Optical control of the charge state of color centers in hexagonal boron nitride
论文作者
论文摘要
我们报告了在低温温度下在硝酸氢硼中使用颜色中心的多色激发实验。我们展示了在2ev左右发射的颜色中心的明亮和黑暗状态之间可控的光学切换。共振或准共振激发还通过两光量过程将颜色中心泵入黑暗状态，并被捕获。光致发光激发光谱揭示了缺陷依赖性能量阈值，可将颜色中心降低到2.2至2.6EV之间的明亮状态。缺陷的光离子和照片充电是对这种行为的最合理的解释，分别是硼的空置潜在候选物的负和中性电荷状态，分别是明亮和黑暗状态的。此外，在与正交极化到发射的吸收中观察到第二个零声子线，被 +0.4EV呼吸，证明了颜色中心的额外能级。
We report on multicolor excitation experiments with color centers in hexagonal boron nitride at cryogenic temperatures. We demonstrate controllable optical switching between bright and dark states of color centers emitting around 2eV. Resonant, or quasi-resonant excitation also pumps the color center, via a two-photon process, into a dark state, where it becomes trapped. Photoluminescence excitation spectroscopy reveals a defect dependent energy threshold for repumping the color center into the bright state of between 2.2 and 2.6eV. Photoionization and photocharging of the defect is the most plausible explanation for this behaviour, with the negative and neutral charge states of the boron vacancy potential candidates for the bright and dark states, respectively. Furthermore, a second zero phonon line, detuned by +0.4eV, is observed in absorption with orthogonal polarization to the emission, evidencing an additional energy level in the color center.
