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

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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [4]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Fribourg (Switzerland)
  2. Max Planck Inst. for the Structure and Dynamics of Matter, Hamburg (Germany)
  3. Max Planck Inst. for the Structure and Dynamics of Matter, Hamburg (Germany); The Flatiron Inst., New York, NY (United States)
  4. Univ. of Fribourg (Switzerland)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; Swiss National Science Foundation (SNSF)
OSTI Identifier:
1608948
Grant/Contract Number:  
AC02-76SF00515; 724103; ERC-2015-AdG-694097
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 9; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Schüler, Michael, De Giovannini, Umberto, Hübener, Hannes, Rubio, Angel, Sentef, Michael A., and Werner, Philipp. Local Berry curvature signatures in dichroic angle-resolved photoelectron spectroscopy from two-dimensional materials. United States: N. p., 2020. Web. doi:10.1126/sciadv.aay2730.
Schüler, Michael, De Giovannini, Umberto, Hübener, Hannes, Rubio, Angel, Sentef, Michael A., & Werner, Philipp. Local Berry curvature signatures in dichroic angle-resolved photoelectron spectroscopy from two-dimensional materials. United States. doi:https://doi.org/10.1126/sciadv.aay2730
Schüler, Michael, De Giovannini, Umberto, Hübener, Hannes, Rubio, Angel, Sentef, Michael A., and Werner, Philipp. Fri . "Local Berry curvature signatures in dichroic angle-resolved photoelectron spectroscopy from two-dimensional materials". United States. doi:https://doi.org/10.1126/sciadv.aay2730. https://www.osti.gov/servlets/purl/1608948.
@article{osti_1608948,
title = {Local Berry curvature signatures in dichroic angle-resolved photoelectron spectroscopy from two-dimensional materials},
author = {Schüler, Michael and De Giovannini, Umberto and Hübener, Hannes and Rubio, Angel and Sentef, Michael A. and Werner, Philipp},
abstractNote = {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.},
doi = {10.1126/sciadv.aay2730},
journal = {Science Advances},
number = 9,
volume = 6,
place = {United States},
year = {2020},
month = {2}
}

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