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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES I09-Surface and Interface Structural Analysis	Electronic structure of the candidate 2D Dirac semimetal SrMnSb2: a combined experimental and theoretical study Shyama V. Ramankutty , Jans Henke , Adriaan Schiphorst , Rajah Nutakki , Stephan Bron , Georgios Araizi-Kanoutas , Shrawan K. Mishra , Lei Li , Yingkai Huang , Timur Kim , Moritz Hoesch , Christoph Schlueter , Tien-Lin Lee , Anne De Visser , Zhicheng Zhong , Jasper Van Wezel , Erik Van Heumen , Mark Golden Scipost Physics 4 DOI: 10.21468/SciPostPhys.4.2.010 Diamond Proposal Number(s): [15189, 16433, 18410] Open Access Show Abstract ▼ Abstract: SrMnSb2 is suggested to be a magnetic topological semimetal. It contains square, 2D Sb planes with non-symmorphic crystal symmetries that could protect band crossings, offering the possibility of a quasi-2D, robust Dirac semi-metal in the form of a stable, bulk (3D) crystal. Here, we report a combined and comprehensive experimental and theoretical investigation of the electronic structure of SrMnSb2, including the first ARPES data on this compound. SrMnSb2 possesses a small Fermi surface originating from highly 2D, sharp and linearly dispersing bands (the Y-states) around the (0,π/a)-point in k-space. The ARPES Fermi surface agrees perfectly with that from bulk-sensitive Shubnikov de Haas data from the same crystals, proving the Y−states to be responsible for electrical conductivity in SrMnSb2. DFT and tight binding (TB) methods are used to model the electronic states, and both show good agreement with the ARPES data. Despite the great promise of the latter, both theory approaches show the Y-states to be gapped above EF, suggesting trivial topology. Subsequent analysis within both theory approaches shows the Berry phase to be zero, indicating the non-topological character of the transport in SrMnSb2, a conclusion backed up by the analysis of the quantum oscillation data from our crystals.	Feb 2018

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I05-ARPES
I09-Surface and Interface Structural Analysis

Electronic structure of the candidate 2D Dirac semimetal SrMnSb2: a combined experimental and theoretical study