Related Experiment Video
Updated: Jan 14, 2026
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.5K
Probing Hole-Magnon Dynamics in an Antiferromagnet with Beyond-Nearest-Neighbor Couplings.
Kaijun Shen1, Kewei Sun2, Shixu Luo1
1School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
The Journal of Physical Chemistry Letters
|October 27, 2025
Summary
Investigating a single hole in a 2D antiferromagnet reveals that frustrating next-nearest-neighbor exchange significantly alters magnetic polaron dynamics, impacting transport properties.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
Background:
- Antiferromagnets exhibit complex magnetic ordering.
- Hole dynamics in magnetic materials are crucial for understanding conductivity.
- Long-range interactions can significantly influence quantum phenomena.
Purpose of the Study:
- To investigate the real-time dynamics of a single hole in a 2D antiferromagnet.
- To understand the impact of frustrating next-nearest-neighbor (NNN) exchange on magnetic polaron formation and transport.
Main Methods:
- Utilized an extended t-J model incorporating nearest-neighbor (NN) and NNN hopping and superexchange.
- Employed the multiple Davydov Ansatz as a numerically accurate variational solver.
- Simulated hole-magnon dynamics on an 8x8 lattice.
Main Results:
- Frustrating NNN exchange qualitatively alters magnetic polaron dynamics.
- Initial frustration promotes transient self-localization of the hole.
- At longer times, frustration opens new propagation channels, increasing root-mean-squared displacement.
Conclusions:
- Beyond nearest-neighbor interactions substantially modify magnetic polaron formation and transport.
- Findings have implications for high-temperature cuprates and cold-atom quantum simulators.
- Understanding these dynamics is key to designing novel electronic materials.
Related Concept Videos
01:31Ferromagnetism
3.0K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.0K
01:17Spin–Spin Coupling: One-Bond Coupling
1.4K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.4K
01:27¹H NMR: Long-Range Coupling
2.6K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.6K
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.4K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.4K
01:08NMR Spectroscopy: Spin–Spin Coupling
2.9K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
2.9K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.6K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.6K