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Instruments / Technical Area	Publication Details	Published
I05-ARPES	Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs A. Garrison Linn , Peipei Hao , Kyle N. Gordon , Dushyant Narayan , Bryan S. Berggren , Nathaniel Speiser , Sonka Reimers , Richard P. Campion , Vít Novák , Sarnjeet S. Dhesi , Timur K. Kim , Cephise Cacho , Libor Šmejkal , Tomáš Jungwirth , Jonathan D. Denlinger , Peter Wadley , Daniel S. Dessau Npj Quantum Materials 8 DOI: 10.1038/s41535-023-00554-x Diamond Proposal Number(s): [24224] Open Access Show Abstract ▼ Abstract: Tetragonal CuMnAs is a room temperature antiferromagnet with an electrically reorientable Néel vector and a Dirac semimetal candidate. Direct measurements of the electronic structure of single-crystalline thin films of tetragonal CuMnAs using angle-resolved photoemission spectroscopy (ARPES) are reported, including Fermi surfaces (FS) and energy-wavevector dispersions. After correcting for a chemical potential shift of ≈− 390 meV (hole doping), there is excellent agreement of FS, orbital character of bands, and Fermi velocities between the experiment and density functional theory calculations. In addition, 2×1 surface reconstructions are found in the low energy electron diffraction (LEED) and ARPES. This work underscores the need to control the chemical potential in tetragonal CuMnAs to enable the exploration and exploitation of the Dirac fermions with tunable masses, which are predicted to be above the chemical potential in the present samples.	May 2023
I05-ARPES	Comparative study of low-lying excitations in cuprate and strontium ruthenate superconductors Peipei Hao , Haoxiang Li , Dushyant M. Narayan , Rafal Kurleto , Bryan S. Berggren , Andrew G. Linn , Amanda Shackelford , Yu Zhang , Hope Whitelock , Gang Cao , Daniel S. Dessau APS March Meeting 2023 Show Abstract ▼ Abstract: High-Tc cuprate superconductors in their normal state are known to have the mysterious strange-metal behavior near optimal doping with strong deviations from the conventional Fermi Liquid form of electronic scattering rates. In particular, these have been described by the marginal-fermi-liquid (MFL) form at optimal doping [1], or more generally the power-law-liquid (PLL) form over all doping levels [2]. Here with careful analysis of the intrinsic line shape of Angle-resolved photoemission (ARPES) dispersion cuts, we report a comparative study of the both ω- and T- dependent scattering rate of (Pb)Bi2Sr2CaCu2O8+δ, La2-xSrxCuO4, as well as the copper-free perovskite superconductor Sr2RuO4. With a unified power-law-liquid form of the imaginary self-energy proposed by Reber et al [2], our fitted parameters reproduce the strange-metal and fermi-liquid-like behavior of the cuprate superconductors and Sr2RuO4, respectively. Surprisingly, we show a much stronger electronic coupling parameter for the scattering in the ruthenates compared to the cuprates, indicating another key difference between these different superconductors.	Mar 2023
I05-ARPES	Observation of topological surface states in the high-temperature superconductor MgB2 Xiaoqing Zhou , Kyle N. Gordon , Kyung-Hwan Jin , Haoxiang Li , Dushyant Narayan , Hengdi Zhao , Hao Zheng , Huaqing Huang , Gang Cao , Nikolai D. Zhigadlo , Feng Liu , Daniel Dessau Physical Review B 100 DOI: 10.1103/PhysRevB.100.184511 Diamond Proposal Number(s): [17595] Show Abstract ▼ Abstract: Most topological superconductors known to date suffer from low transition temperatures ( T c ) and/or high fragility to disorder and dopant levels, which is hampering the progress in this promising field. Here, utilizing a combination of angle-resolved photoemission spectroscopy measurements and density-functional theory calculations, we show the presence of a type of topological Dirac nodal line surface state on the [010] faces of the T c = 39 K BCS superconductor MgB 2 . This surface state should be highly tolerant against disorder and inadvertent doping variations and is expected to go superconducting via the proximity effect to the bulk superconductor that this state is intimately connected to. This would represent a form of high-temperature topological superconductivity.	Nov 2019

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