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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Bias-free access to orbital angular momentum in two-dimensional quantum materials Jonas Erhardt , Cedric Schmitt , Philipp Eck , Matthias Schmitt , Philipp Kessler , Kyungchan Lee , Timur Kim , Cephise Cacho , Iulia Cojocariu , Daniel Baranowski , Vitaliy Feyer , Louis Veyrat , Giorgio Sangiovanni , Ralph Claessen , Simon Moser Physical Review Letters 132 DOI: 10.1103/PhysRevLett.132.196401 Diamond Proposal Number(s): [30583] Show Abstract ▼ Abstract: The demonstration of a topological band inversion constitutes the most elementary proof of a quantum spin Hall insulator (QSHI). On a fundamental level, such an inverted band gap is intrinsically related to the bulk Berry curvature, a gauge-invariant fingerprint of the wave function’s quantum geometric properties in Hilbert space. Intimately tied to orbital angular momentum (OAM), the Berry curvature can be, in principle, extracted from circular dichroism in angle-resolved photoemission spectroscopy (CD-ARPES), were it not for interfering final state photoelectron emission channels that obscure the initial state OAM signature. Here, we outline a full-experimental strategy to avoid such interference artifacts and isolate the clean OAM from the CD-ARPES response. Bench-marking this strategy for the recently discovered atomic monolayer system indenene, we demonstrate its distinct QSHI character and establish CD-ARPES as a scalable bulk probe to experimentally classify the topology of two-dimensional quantum materials with time reversal symmetry.	May 2024
I05-ARPES	Observation of termination-dependent topological connectivity in a magnetic Weyl kagome lattice Federico Mazzola , Stefan Enzner , Philipp Eck , Chiara Bigi , Matteo Jugovac , Iulia Cojocariu , Vitaliy Feyer , Zhixue Shu , Gian Marco Pierantozzi , Alessandro De Vita , Pietro Carrara , Jun Fujii , Phil D. C. King , Giovanni Vinai , Pasquale Orgiani , Cephise Cacho , Matthew D. Watson , Giorgio Rossi , Ivana Vobornik , Tai Kong , Domenico Di Sante , Giorgio Sangiovanni , Giancarlo Panaccione Nano Letters DOI: 10.1021/acs.nanolett.3c02022 Diamond Proposal Number(s): [30171] Open Access Show Abstract ▼ Abstract: Engineering surfaces and interfaces of materials promises great potential in the field of heterostructures and quantum matter designers, with the opportunity to drive new many-body phases that are absent in the bulk compounds. Here, we focus on the magnetic Weyl kagome system Co3Sn2S2 and show how for the terminations of different samples the Weyl points connect differently, still preserving the bulk-boundary correspondence. Scanning tunneling microscopy has suggested such a scenario indirectly, and here, we probe the Fermiology of Co3Sn2S2 directly, by linking it to its real space surface distribution. By combining micro-ARPES and first-principles calculations, we measure the energy-momentum spectra and the Fermi surfaces of Co3Sn2S2 for different surface terminations and show the existence of topological features depending on the top-layer electronic environment. Our work helps to define a route for controlling bulk-derived topological properties by means of surface electrostatic potentials, offering a methodology for using Weyl kagome metals in responsive magnetic spintronics.	Aug 2023

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