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  Local Berry curvature signatures in dichroic angle-resolved photoelectron spectroscopy from two-dimensional materials

Schüler, M., de Giovannini, U., Hübener, H., Rubio, A., Sentef, M. A., & Werner, P. (2020). Local Berry curvature signatures in dichroic angle-resolved photoelectron spectroscopy from two-dimensional materials. Science Advances, 6(9): eaay2730. doi:10.1126/sciadv.aay2730.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0003-AFCB-4 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-C060-5
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 Creators:
Schüler, M.1, 2, Author
de Giovannini, U.3, Author           
Hübener, H.3, Author           
Rubio, A.3, 4, Author           
Sentef, M. A.5, Author           
Werner, P.2, Author
Affiliations:
1Stanford Institute for Materials and Energy Sciences (SIMES), SLAC National Accelerator Laboratory, ou_persistent22              
2Department of Physics, University of Fribourg, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              
5Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              

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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.

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Language(s): eng - English
 Dates: 2019-06-042019-12-042020-02-28
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: arXiv: 1905.09404
DOI: 10.1126/sciadv.aay2730
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Project name : We acknowledge financial support from the Swiss National Science Foundation via NCCR MARVEL and the European Research Council via ERC-2015-AdG-694097 and ERC Consolidator Grant No. 724103. The Flatiron Institute is a division of the Simons Foundation. M.S. thanks the Alexander von Humboldt Foundation for its support with a Feodor Lynen scholarship. M.A.S. acknowledges financial support by the DFG through the Emmy Noether program (SE 2558/2-1).
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 6 (9) Sequence Number: eaay2730 Start / End Page: - Identifier: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548