Local Berry curvature signatures in dichroic angle-resolved photoelectron spectroscopy from two-dimensional materials.
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ID: 101805
2020
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Abstract
Topologically nontrivial two-dimensional materials hold great promise for next-generation optoelectronic applications. However, measuring the Hall or spin-Hall response is often a challenge and practically limited to the ground state. An experimental technique for tracing the topological character in a differential fashion would provide useful insights. In this work, we show that circular dichroism angle-resolved photoelectron spectroscopy provides a powerful tool that can resolve the topological and quantum-geometrical character in momentum space. In particular, we investigate how to map out the signatures of the momentum-resolved Berry curvature in two-dimensional materials by exploiting its intimate connection to the orbital polarization. A spin-resolved detection of the photoelectrons allows one to extend the approach to spin-Chern insulators. The present proposal can be extended to address topological properties in materials out of equilibrium in a time-resolved fashion.
| Reference Key |
schuler2020localscience
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|---|---|
| Authors | Schüler, Michael;De Giovannini, Umberto;Hübener, Hannes;Rubio, Angel;Sentef, Michael A;Werner, Philipp; |
| Journal | Science advances |
| Year | 2020 |
| DOI |
10.1126/sciadv.aay2730
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