Academic Journal
Tuning the Direct and Indirect Excitonic Transitions of h-BN by Hydrostatic Pressure
| العنوان: | Tuning the Direct and Indirect Excitonic Transitions of h-BN by Hydrostatic Pressure |
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| المؤلفون: | Segura, Alfredo, Cuscó, Ramón, Attaccalite, Claudio, Taniguchi, Takashi, Watanabe, Kenji, Artús, Lluís |
| المساهمون: | Ministerio de Economía y Competitividad (España), European Commission, Cuscó, Ramón, Artús, Lluís |
| بيانات النشر: | ACS Publications |
| سنة النشر: | 2021 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| مصطلحات موضوعية: | Energy, Electrical conductivity, Excitons,Absorption, Optical properties |
| الوصف: | The pressure dependence of the direct and indirect bandgap transitions of hexagonal boron nitride is investigated using optical reflectance under hydrostatic pressure in an anvil cell with sapphire windows up to 2.5 GPa. Features in the reflectance spectra associated with the absorption at the direct and indirect bandgap transitions are found to downshift with increasing pressure, with pressure coefficients of −26 ± 2 and −36 ± 2 meV GPa–1, respectively. The GW calculations yield a faster decrease of the direct bandgap with pressure compared to the indirect bandgap. Including the strong excitonic effects through the Bethe–Salpeter equation, the direct excitonic transition is found to have a much lower pressure coefficient than the indirect excitonic transition. This suggests a strong variation of the binding energy of the direct exciton with pressure. The experiments corroborate the theoretical predictions and indicate an enhancement of the indirect nature of the bulk hexagonal boron nitride crystal under hydrostatic pressure. ; This work was supported by the Spanish MINECO/FEDER under Grant Nos. MAT2015-71035-R, MAT2016-75586-C4- 1-P, and PID2019-106383GB-C41. C.A. acknowledges funding from the European Union Seventh Framework Program under Grant Agreement No. 785219 Graphene Core 2 and COST Action TUMIEE CA17126. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant No. JPMXP0112101001, JSPS KAKENHI Gr a n t No. JP20H00354 , and the CREST(JPMJCR15F3), JST. ; Peer reviewed |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1932-7447 1932-7455 |
| Relation: | #PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2015-71035-R; info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-75586-C4- 1-P; info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/PID2019-106383GB-C41; info:eu-repo/grantAgreement/EC/FP7/785219; Postprint; https://doi.org/10.1021/acs.jpcc.1c02082; Sí; Journal of Physical Chemistry C, 125(23): 12880–12885 (2021); http://hdl.handle.net/10261/245040; http://dx.doi.org/10.13039/501100000780; http://dx.doi.org/10.13039/501100003329 |
| DOI: | 10.1021/acs.jpcc.1c02082 |
| DOI: | 10.13039/501100000780 |
| DOI: | 10.13039/501100003329 |
| الاتاحة: | http://hdl.handle.net/10261/245040 https://doi.org/10.1021/acs.jpcc.1c02082 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100003329 |
| Rights: | open |
| رقم الانضمام: | edsbas.38828E23 |
| قاعدة البيانات: | BASE |
| تدمد: | 19327447 19327455 |
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| DOI: | 10.1021/acs.jpcc.1c02082 |