Giant spin-selective bandgap renormalization in CsPbBr 3 colloidal nanocrystals
Abstract
The spin-dependence of the strongly correlated phenomena and many-body interactions play an important role in quantum information science. In particular, it is quite interesting but unclear how the spin degree of freedom ramifies the bandgap renormalization, one of the fundamental many-body phenomena. We report the first room-temperature observation of giant spin-selective bandgap renormalization (SS-BGR) in CsPbBr3 colloidal nanocrystals using time-resolved circularly polarized femtosecond pump-probe spectroscopy. The SS-BGR results from many-body interactions among carriers with the same spin that renormalize their joint density of states by 57+/- 1 meV, visualized here as photoinduced absorption (PIA) below band-edge transition energy when the pump and probe are co-polarized. The hallmark result of spectrally resolved SS-BGR is in stark contrast to the usually submerged signal in II-VI and III-V semiconductors and is 3 orders of magnitude larger than that observed in Ge/SiGe quantum wells, highlighting the unique and beneficial band structure of the metal-halide semiconductors. We propose that the PIA, due to SS-BGR, can be used to describe the spin-polarization and spin-relaxation dynamics. The experimental and theoretical findings open up new possibilities for optical manipulation of spin degrees of freedom and their many-body interactions in metal-halide perovskite nanocrystals for potential room-temperature applications.
- Authors:
-
- Indian Inst. of Science Education and Research, Bhopal (India)
- National Renewable Energy Lab. (NREL), Golden, CO (United States); Indian Inst. of Chemical Technology, Tarnaka (India)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1882927
- Report Number(s):
- NREL/JA-5900-82268
Journal ID: ISSN 2469-9950; MainId:83041;UUID:00c74667-f6db-40ec-b7fb-af416cde76e2;MainAdminID:64828; TRN: US2307951
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 4; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; bandgap renormalization; CsPbBr3; spin polarization; spin-selective; room-temperature
Citation Formats
Shrivastava, Megha, Hazarika, Abhijit, Aneesh, J., Mandal, Dipendranath, Beard, Matthew C., and Adarsh, K. V. Giant spin-selective bandgap renormalization in CsPbBr3 colloidal nanocrystals. United States: N. p., 2022.
Web. doi:10.1103/physrevb.106.l041404.
Shrivastava, Megha, Hazarika, Abhijit, Aneesh, J., Mandal, Dipendranath, Beard, Matthew C., & Adarsh, K. V. Giant spin-selective bandgap renormalization in CsPbBr3 colloidal nanocrystals. United States. https://doi.org/10.1103/physrevb.106.l041404
Shrivastava, Megha, Hazarika, Abhijit, Aneesh, J., Mandal, Dipendranath, Beard, Matthew C., and Adarsh, K. V. Tue .
"Giant spin-selective bandgap renormalization in CsPbBr3 colloidal nanocrystals". United States. https://doi.org/10.1103/physrevb.106.l041404. https://www.osti.gov/servlets/purl/1882927.
@article{osti_1882927,
title = {Giant spin-selective bandgap renormalization in CsPbBr3 colloidal nanocrystals},
author = {Shrivastava, Megha and Hazarika, Abhijit and Aneesh, J. and Mandal, Dipendranath and Beard, Matthew C. and Adarsh, K. V.},
abstractNote = {The spin-dependence of the strongly correlated phenomena and many-body interactions play an important role in quantum information science. In particular, it is quite interesting but unclear how the spin degree of freedom ramifies the bandgap renormalization, one of the fundamental many-body phenomena. We report the first room-temperature observation of giant spin-selective bandgap renormalization (SS-BGR) in CsPbBr3 colloidal nanocrystals using time-resolved circularly polarized femtosecond pump-probe spectroscopy. The SS-BGR results from many-body interactions among carriers with the same spin that renormalize their joint density of states by 57+/- 1 meV, visualized here as photoinduced absorption (PIA) below band-edge transition energy when the pump and probe are co-polarized. The hallmark result of spectrally resolved SS-BGR is in stark contrast to the usually submerged signal in II-VI and III-V semiconductors and is 3 orders of magnitude larger than that observed in Ge/SiGe quantum wells, highlighting the unique and beneficial band structure of the metal-halide semiconductors. We propose that the PIA, due to SS-BGR, can be used to describe the spin-polarization and spin-relaxation dynamics. The experimental and theoretical findings open up new possibilities for optical manipulation of spin degrees of freedom and their many-body interactions in metal-halide perovskite nanocrystals for potential room-temperature applications.},
doi = {10.1103/physrevb.106.l041404},
journal = {Physical Review. B},
number = 4,
volume = 106,
place = {United States},
year = {Tue Jul 05 00:00:00 EDT 2022},
month = {Tue Jul 05 00:00:00 EDT 2022}
}
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