Formation of the skyrmionic polaron by Rashba and Dresselhaus spin-orbit coupling

Sahu, Pratik; Nanda, B. K.; Satpathy, S.

doi:10.1103/physrevb.106.224403

Formation of the skyrmionic polaron by Rashba and Dresselhaus spin-orbit coupling

Journal Article · Tue Dec 06 00:00:00 EST 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.224403· OSTI ID:2418923

^[1]; Nanda, B. K. ^[2]; Satpathy, S. ^[3]

Univ. of Missouri, Columbia, MO (United States; Indian Institute of Technology Madras, Tamil Nadu (India); OSTI
Indian Institute of Technology Madras, Tamil Nadu (India)
Univ. of Missouri, Columbia, MO (United States; Indian Institute of Technology Madras, Tamil Nadu (India)

Skyrmions in reduced dimensions such as thin layers and interfaces are of both fundamental and technological importance. In these systems, itinerant electrons are often present together with the Rashba and Dresselhaus spin-orbit coupling (SOC). Here, in this study, we show that an itinerant electron in the presence of these interactions can nucleate the skyrmion state, even when the standard Dzyaloshinskii-Moriya interaction (DMI) is absent, and the electron can become self-trapped in the skyrmion core, forming the “skyrmionic polaron” (SkP). The formation of the SkP is investigated from a continuum model of the electron, exchange coupled to the lattice spins, by solving the appropriate Euler-Lagrange equations. The skyrmion (antiskyrmion) texture is favored by the Rashba (Dresselhaus) SOC, with the binding energy increasing quadratically with the strength of the interaction. In contrast, if the skyrmion is already formed due to a nonzero DMI, the electron is delocalized and avoids the skyrmion core until the strength of the Rashba or Dresselhaus SOC exceeds a critical value. Below this critical value, the electron is not bound to the skyrmion core, the polaron does not form, and the electron has little effect on the skyrmion state. Our work envisions the possibility of manipulating the skyrmion state in device applications by altering the strength of the Rashba or Dresselhaus interactions, e.g., by an external electric field.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Missouri, Columbia, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: FG02-00ER45818

OSTI ID:: 2418923

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 22 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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