Electronic self-passivation of single vacancy in black phosphorus via ionization

0558203 - FZÚ 2023 RIV US eng J - Článek v odborném periodiku
Fang, H.Y. - Gallardo Caparrós, Aurelio Jesús - Dulal, D. - Qiu, Z.Z. - Su, J. - Telychko, M. - Mahalingam, H. - Lyu, P. - Han, Y.X. - Zheng, Y. - Cai, Y.Q. - Rodin, A. - Jelínek, Pavel - Lu, J.
Electronic self-passivation of single vacancy in black phosphorus via ionization.
Physical Review Letters. Roč. 128, č. 17 (2022), č. článku 176801. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GX20-13692X
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760; AV ČR(CZ) AP1601
Program: Akademická prémie - Praemium Academiae
Institucionální podpora: RVO:68378271
Klíčová slova: SPM * black phosphorous * electronic structure * vacancies
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 8.6, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevLett.128.176801

We report that monoelemental black phosphorus presents a new electronic self-passivation scheme of single vacancy (SV). By means of low-temperature scanning tunneling microscopy and noncontact atomic force microscopy, we demonstrate that the local reconstruction and ionization of SV into negatively charged SV− leads to the passivation of dangling bonds and, thus, the quenching of in-gap states, which can be achieved by mild thermal annealing or STM tip manipulation. SV exhibits a strong and symmetric Friedel oscillation (FO) pattern, while SV− shows an asymmetric FO pattern with local perturbation amplitude reduced by one order of magnitude and a faster decay rate. The enhanced passivation by forming SV− can be attributed to its weak dipolelike perturbation, consistent with density-functional theory numerical calculations. Therefore, self-passivated SV− is electrically benign and acts as a much weaker scattering center, which may hold the key to further enhance the charge mobility of black phosphorus and its analogs.
Trvalý link: https://hdl.handle.net/11104/0334111