Instantons in chiral magnets
Abstract
In this work, we exhaustively construct instanton solutions and elucidate their properties in one-dimensional antiferromagnetic chiral magnets based on the $$\textit{O}(3)$$ nonlinear sigma model description of spin chains with the Dzyaloshinskii-Moriya (DM) interaction. By introducing an easy-axis potential and a staggered magnetic field, we obtain a phase diagram consisting of ground-state phases with two points (or one point) in the easy-axis dominant cases, a helical modulation at a fixed latitude of the sphere, and a tricritical point allowing helical modulations at an arbitrary latitude. We find that instantons (or skyrmions in two-dimensional Euclidean space) appear as composite solitons in different fashions in these phases: temporal domain walls or wall-antiwall pairs (bions) in the easy-axis dominant cases, dislocations (or phase slips called merons) with fractional instanton numbers in the helical state, and isolated instantons and calorons living on the top of the helical modulation at the tricritical point. We also show that the models with DM interaction and an easy-plane potential can be mapped into those without them, providing a useful tool to investigate the model with the DM interaction.
- Authors:
-
- Keio University, Kanagawa (Japan); RIKEN, Saitama (Japan); Univ. of Illinois, Chicago, IL (United States)
- Keio University, Kanagawa (Japan)
- Akita University (Japan); Keio University, Kanagawa (Japan); RIKEN, Saitama (Japan)
- Keio University, Kanagawa (Japan); RIKEN, Saitama (Japan)
- Publication Date:
- Research Org.:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Org.:
- Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT); USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1800024
- Alternate Identifier(s):
- OSTI ID: 1605969
- Grant/Contract Number:
- FG02-01ER41195; S1511006; 18H01217; 18K03627; 19K03817; 16H03984; 15H05855; FG0201ER41195
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 10; 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; Materials Science; Physics
Citation Formats
Hongo, Masaru, Fujimori, Toshiaki, Misumi, Tatsuhiro, Nitta, Muneto, and Sakai, Norisuke. Instantons in chiral magnets. United States: N. p., 2020.
Web. doi:10.1103/physrevb.101.104417.
Hongo, Masaru, Fujimori, Toshiaki, Misumi, Tatsuhiro, Nitta, Muneto, & Sakai, Norisuke. Instantons in chiral magnets. United States. https://doi.org/10.1103/physrevb.101.104417
Hongo, Masaru, Fujimori, Toshiaki, Misumi, Tatsuhiro, Nitta, Muneto, and Sakai, Norisuke. Mon .
"Instantons in chiral magnets". United States. https://doi.org/10.1103/physrevb.101.104417. https://www.osti.gov/servlets/purl/1800024.
@article{osti_1800024,
title = {Instantons in chiral magnets},
author = {Hongo, Masaru and Fujimori, Toshiaki and Misumi, Tatsuhiro and Nitta, Muneto and Sakai, Norisuke},
abstractNote = {In this work, we exhaustively construct instanton solutions and elucidate their properties in one-dimensional antiferromagnetic chiral magnets based on the $\textit{O}(3)$ nonlinear sigma model description of spin chains with the Dzyaloshinskii-Moriya (DM) interaction. By introducing an easy-axis potential and a staggered magnetic field, we obtain a phase diagram consisting of ground-state phases with two points (or one point) in the easy-axis dominant cases, a helical modulation at a fixed latitude of the sphere, and a tricritical point allowing helical modulations at an arbitrary latitude. We find that instantons (or skyrmions in two-dimensional Euclidean space) appear as composite solitons in different fashions in these phases: temporal domain walls or wall-antiwall pairs (bions) in the easy-axis dominant cases, dislocations (or phase slips called merons) with fractional instanton numbers in the helical state, and isolated instantons and calorons living on the top of the helical modulation at the tricritical point. We also show that the models with DM interaction and an easy-plane potential can be mapped into those without them, providing a useful tool to investigate the model with the DM interaction.},
doi = {10.1103/physrevb.101.104417},
journal = {Physical Review B},
number = 10,
volume = 101,
place = {United States},
year = {Mon Mar 23 00:00:00 EDT 2020},
month = {Mon Mar 23 00:00:00 EDT 2020}
}
Web of Science
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