Data di Pubblicazione:
2023
Citazione:
Flat band separation and resilient spin-Berry curvature in bilayer kagome metals / D. Di Sante, C. Bigi, P. Eck, S. Enzner, A. Consiglio, G. Pokharel, P. Carrara, P. Orgiani, V. Polewczyk, J. Fujii, P.D.C. King, I. Vobornik, G. Rossi, I. Zeljkovic, S.D. Wilson, R. Thomale, G. Sangiovanni, G. Panaccione, F. Mazzola. - In: NATURE PHYSICS. - ISSN 1745-2473. - 2023:(2023 May 18), pp. 1-9. [10.1038/s41567-023-02053-z]
Abstract:
Kagome materials have emerged as a setting for emergent electronic
phenomena that encompass different aspects of symmetry and topology.
It is debated whether the XV6Sn6 kagome family (where X is a rare-earth
element), a recently discovered family of bilayer kagome metals, hosts
a topologically non-trivial ground state resulting from the opening of
spin–orbit coupling gaps. These states would carry a finite spin Berry
curvature, and topological surface states. Here we investigate the spin
and electronic structure of the XV6Sn6 kagome family. We obtain evidence
for a finite spin Berry curvature contribution at the centre of the Brillouin
zone, where the nearly flat band detaches from the dispersing Dirac band
because of spin–orbit coupling. In addition, the spin Berry curvature
is further investigated in the charge density wave regime of ScV6Sn6
and it is found to be robust against the onset of the temperature-driven
ordered phase. Utilizing the sensitivity of angle-resolved photoemission
spectroscopy to the spin and orbital angular momentum, our work unveils
the spin Berry curvature of topological kagome metals and helps to define
its spectroscopic fingerprint.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
D. Di Sante, C. Bigi, P. Eck, S. Enzner, A. Consiglio, G. Pokharel, P. Carrara, P. Orgiani, V. Polewczyk, J. Fujii, P.D.C. King, I. Vobornik, G. Rossi, I. Zeljkovic, S.D. Wilson, R. Thomale, G. Sangiovanni, G. Panaccione, F. Mazzola
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