Work

Pseudomagnetic fields in square lattices

Year: 2023

Type: article

Abstract: We have investigated the effects of strain on two-dimensional square lattices and examined the methods for inducing pseudomagnetic fields. In both the columnar and staggered $\ensuremath{\pi}$-flux square lattices, we have found that strain only modulates Fermi velocities rather than inducing pseudomagnetic fields. However, spatially nonuniform on-site potentials (anisotropic hoppings) can create pseudomagnetic fields in columnar (staggered) $\ensuremath{\pi}$-flux square lattices. On the other hand, we demonstrate that strain does induce pseudomagnetic fields in staggered zero-flux square lattices. By breaking a quarter of the bonds, we clarify that a staggered zero-flux square lattice is topologically equivalent to a honeycomb lattice and displays pseudovector potentials and pseudo-Landau-levels at the Dirac points.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.108.205149

Authors: Junsong Sun, Xingchuan Zhu, Tianyu Liu, Shiping Feng, Huaiming Guo

Institutions: Beihang University, Nanjing University of Science and Technology, Southern University of Science and Technology, Shenzhen International Quantum Academy, Beijing Normal University

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China, Basic and Applied Basic Research Foundation of Guangdong Province