期刊
NANO LETTERS
卷 20, 期 6, 页码 4256-4263出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00751
关键词
Color center; hexagonal boron-nitride; 2D materials; single photon source
类别
资金
- Engineering and Physical Sciences Research Council [EP/S001557/1, EP/026656/1]
- EPSRC [EP/P026656/1, EP/S001557/1] Funding Source: UKRI
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 2 eV. Resonant, or quasi-resonant, excitation of photoluminescence also pumps the color center, via a two-photon process, into a dark state, where it becomes trapped. Repumping back into the bright state has a step-like spectrum with a defect-dependent threshold between 2.25 and 2.6 eV. This behavior is consistent with photoionization and charging between optically bright and dark states of the defect. Furthermore, a second zero phonon line, detuned by +0.4 eV, is observed in absorption with orthogonal polarization to the emission, evidencing an additional energy level in the color center.
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