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Emergence of a bandgap in nano-scale graphite: A computational and experimental study
| Citace: |
CHAIYACHAD, S.; VO, P.; JINDATA, W.; SINGSEN, S.; EKNAPAKUL, T.; JAISUK, CH.; FEVRE, PL.; BERTRAN, F.; LU, D.; HUANG, Y.; NAKAJIMA, H.; LIEWRIAN, W.; FONGKAEW, I.; MINÁR, J.; MEEVASANA, W. Emergence of a bandgap in nano-scale graphite: A computational and experimental study. APPLIED SURFACE SCIENCE, 2025, roč. 708, č. NOV 1 2025, s. nestránkováno. ISSN 0169-4332.
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| Druh: | ČLÁNEK |
| Jazyk publikace: | eng |
| Anglický název: | Emergence of a bandgap in nano-scale graphite: A computational and experimental study |
| Rok vydání: | 2025 |
| Autoři: | Sujinda Chaiyachad , Phuc Vo MSc , Warakorn Jindata , Sirisak Singsen , Tanachat Eknapakul , Chutchawan Jaisuk , Patrick Le Fevre , Francois Bertran , Donghui Lu , Yaobo Huang , Hideki Nakajima , Watchara Liewrian , Ittipon Fongkaew , prof. Dr. Jan Minár , Worawat Meevasana |
| Abstrakt EN: | Bandgaps in layered materials are critical for enabling functionalities such as tunable photodetection, efficient energy conversion, and nonlinear optical responses, which are essential for next-generation photonic and quantum devices. Gap engineering could form heterostructures with complementary materials like transition metal dichalcogenides or perovskites for multifunctional devices. Graphite, conventionally regarded as a gapless material, exhibits a bandgap of similar to 100 meV in nano-scale patterned highly oriented pyrolytic graphite (HOPG), as revealed by angle-resolved photoemission spectroscopy (ARPES) and Raman measurements. Our state-of-the-art calculations, incorporating photoemission matrix element effects, predict this bandgap with remarkable accuracy and attribute it to mechanical distortions introduced during patterning. This work bridges theory and experiment, providing the direct evidence of a tunable bandgap in HOPG. Beyond its fundamental significance, this finding opens new possibilities for designing materials with tailored electronic properties, enabling advancements in terahertz devices and optoelectronics. |
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