RT Journal Article
SR Electronic
T1 Local Berry curvature signatures in dichroic angle-resolved photoelectron spectroscopy from two-dimensional materials
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaay2730
DO 10.1126/sciadv.aay2730
VO 6
IS 9
A1 Schüler, Michael
A1 De Giovannini, Umberto
A1 Hübener, Hannes
A1 Rubio, Angel
A1 Sentef, Michael A.
A1 Werner, Philipp
YR 2020
UL http://advances.sciencemag.org/content/6/9/eaay2730.abstract
AB 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.