In this work we explore the effects of nonlinearity on three-dimensional topological phases. Of particular interest are the so-called Weyl semimetals, known for their Weyl nodes, i.e., pointlike topological charges which always exist in pairs and demonstrate remarkable robustness against general perturbations. It is found that the presence of onsite nonlinearity causes each of these Weyl nodes to break down into nodal lines and nodal surfaces at two different energies while preserving its topological charge. Depending on the system considered, additional nodal lines may further emerge at high nonlinearity strength. We propose two different ways to probe the observed nodal structures. First, the use of an adiabatic pumping process allows the detection of the nodal lines and surfaces arising from the original Weyl nodes. Second, an Aharonov-Bohm interference experiment is particularly fruitful to capture additional nodal lines that emerge at high nonlinearity.
|Journal||Physical Review B|
|State||Published - 15 Nov 2022|
Bibliographical noteFunding Information:
R.W.B is supported by the Australian Research Council Centre of Excellence for Engineered Quantum Systems (EQUS Grant No. CE170100009). J.G. is funded by the Singapore National Research Foundation Grant No. NRF-NRFI2017-04 (WBS Grant No. R-144-000-378- 281).
© 2022 American Physical Society.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics