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Title: Signature of ultrafast formation and annihilation of polaronic states in a layered ferromagnet
Authors: Yin, Tingting
You, Jing-Yang
Huang, Yuqing
Do, Thi Thu Ha
Prosnikov, Mikail A.
Zhao, Weijie
Serra, Marco
Christianen, Peter C. M.
Sofer, Zdenek
Sun, Handong
Feng, Yuan Ping
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2022
Source: Yin, T., You, J., Huang, Y., Do, T. T. H., Prosnikov, M. A., Zhao, W., Serra, M., Christianen, P. C. M., Sofer, Z., Sun, H., Feng, Y. P. & Xiong, Q. (2022). Signature of ultrafast formation and annihilation of polaronic states in a layered ferromagnet. Nano Letters, 22(19), 7784-7790.
Project: NRF-CRP21-2018-0007
Journal: Nano Letters
Abstract: The strong interaction between charge and lattice vibration gives rise to a polaron, which has a profound effect on optical and transport properties of matters. In magnetic materials, polarons are involved in spin dependent transport, which can be potentially tailored for spintronic and opto-spintronic device applications. Here, we identify the signature of ultrafast formation of polaronic states in CrBr3. The polaronic states are long-lived, having a lifetime on the time scale of nanoseconds to microseconds, which coincides with the emission lifetime of ∼4.3 μs. Transition of the polaronic states is strongly screened by the phonon, generating a redshift of the transition energy ∼0.2 eV. Moreover, energy-dependent localization of polaronic states is discovered followed by transport/annihilation properties. These results shed light on the nature of the polarons and their formation and transport dynamics in layered magnetic materials, which paves the way for the rational design of two-dimensional magnetic devices.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.2c01771
Schools: School of Physical and Mathematical Sciences 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © 2022 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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