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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 I09-Surface and Interface Structural Analysis	Achieving environmental stability in an atomically thin quantum spin Hall insulator via graphene intercalation Cedric Schmitt , Jonas Erhardt , Philipp Eck , Matthias Schmitt , Kyungchan Lee , Philipp Keßler , Tim Wagner , Merit Spring , Bing Liu , Stefan Enzner , Martin Kamp , Vedran Jovic , Chris Jozwiak , Aaron Bostwick , Eli Rotenberg , Timur Kim , Cephise Cacho , Tien-Lin Lee , Giorgio Sangiovanni , Simon Moser , Ralph Claessen Nature Communications 15 DOI: 10.1038/s41467-024-45816-9 Diamond Proposal Number(s): [31808, 25151, 30583] Open Access Show Abstract ▼ Abstract: Atomic monolayers on semiconductor surfaces represent an emerging class of functional quantum materials in the two-dimensional limit — ranging from superconductors and Mott insulators to ferroelectrics and quantum spin Hall insulators. Indenene, a triangular monolayer of indium with a gap of ~ 120 meV is a quantum spin Hall insulator whose micron-scale epitaxial growth on SiC(0001) makes it technologically relevant. However, its suitability for room-temperature spintronics is challenged by the instability of its topological character in air. It is imperative to develop a strategy to protect the topological nature of indenene during ex situ processing and device fabrication. Here we show that intercalation of indenene into epitaxial graphene provides effective protection from the oxidising environment, while preserving an intact topological character. Our approach opens a rich realm of ex situ experimental opportunities, priming monolayer quantum spin Hall insulators for realistic device fabrication and access to topologically protected edge channels.	Feb 2024

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