| Title | Holes and magnetic polarons in a triangular lattice antiferromagnet |
| Author | |
| Corresponding Author | Bruun, Georg M. |
| Publication Years | 2022-12-21
|
| DOI | |
| Source Title | |
| ISSN | 2469-9950
|
| EISSN | 2469-9969
|
| Volume | 106Issue:23 |
| Abstract | The intricate interplay between charge motion and magnetic order in geometrically frustrated lattices is central for the properties of many two-dimensional quantum materials. The triangular lattice antiferromagnet is a canonical example of a frustrated system, and here we analyze the dynamics of a hole in such a lattice focusing on observables that have become accessible in a new generation of experiments. Using the t - J model, we solve the problem exactly within linear spin wave theory in the limit of strong magnetic interactions, showing that the ground state is described by a coherent state of spin waves. The derivation highlights the crucial role played by the interaction between a static hole and the neighboring spins, which originates in the geometric frustration and has often been omitted in earlier works. Furthermore, we show that the nonequilibrium dynamics after a hole has abruptly been inserted at a lattice site is given by a coherent state with time-dependent oscillatory coefficients. Physically, this describes a burst of magnetic frustration propagating through only two-thirds of the lattice sites, since a destructive interference of spin waves leaves spins parallel to that removed by the hole unperturbed. After the wave has propagated through the lattice, the magnetization relaxes to that of the ground state. We then use our analytical solution to benchmark the widely used self-consistent Born approximation (SCBA) in the limit of strong magnetic interactions, showing that it is very accurate also for a triangular lattice. The magnetic polaron spectrum is analyzed for general magnetic interactions using the SCBA, and we compare our results with those for a square lattice. |
| URL | [Source Record] |
| Indexed By | |
| Language | English
|
| Important Publications | NI Journal Papers
|
| SUSTech Authorship | Corresponding
|
| Funding Project | Danish National Research Foundation through the Center of Excellence "CCQ"[DNRF156]
|
| WOS Research Area | Materials Science
; Physics
|
| WOS Subject | Materials Science, Multidisciplinary
; Physics, Applied
; Physics, Condensed Matter
|
| WOS Accession No | WOS:000905093100003
|
| Publisher | |
| ESI Research Field | PHYSICS
|
| Data Source | Web of Science
|
| Citation statistics |
Cited Times [WOS]:0
|
| Document Type | Journal Article |
| Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/424669 |
| Department | Institute for Quantum Science and Engineering 理学院_物理系 |
| Affiliation | 1.Eindhoven Univ Technol, POB 513, NL-5600 MB Eindhoven, Netherlands 2.Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, Germany 3.Aarhus Univ, Ctr Complex Quantum Syst, Dept Phys & Astron, Ny Munkegade, DK-8000 Aarhus, Denmark 4.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China 5.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China |
| Corresponding Author Affilication | Institute for Quantum Science and Engineering; Department of Physics |
| Recommended Citation GB/T 7714 |
Kraats, Jasper,Nielsen, Kristian K.,Bruun, Georg M.. Holes and magnetic polarons in a triangular lattice antiferromagnet[J]. PHYSICAL REVIEW B,2022,106(23).
|
| APA |
Kraats, Jasper,Nielsen, Kristian K.,&Bruun, Georg M..(2022).Holes and magnetic polarons in a triangular lattice antiferromagnet.PHYSICAL REVIEW B,106(23).
|
| MLA |
Kraats, Jasper,et al."Holes and magnetic polarons in a triangular lattice antiferromagnet".PHYSICAL REVIEW B 106.23(2022).
|
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