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Termination Dependent Topological Surface States in Nodal Loop Semimetal HfP2

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arxiv 1906.09642 v1 pith:NNF2FFY4 submitted 2019-06-23 cond-mat.mes-hall

Christopher Sims , M. Mofazzel Hosen , Hugo Aramberri , Cheng-Yi Huang , Gyanendra Dhakal , Klauss Dimitri , Firoza Kabir , Sabin Regmi
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Xiaoting Zhou Tay-Rong Chang Hsin Lin Dariusz Kaczorowski Nicholas Kioussis Madhab Neupane
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classification cond-mat.mes-hall
keywords statestopologicalsurfacenodaldependentexperimentalfirsthfp2
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Symmetry plays a major role in all disciplines of physics. Within the field of topological materials there is a great interest in understanding how the mechanics of crystalline and internal symmetries protect crossings between the conduction and valence bands. Additionally, exploring this direction can lead to a deeper understanding on the topological properties of crystals hosting a variety of symmetries. For the first time, we report the experimental observation of topological surface states in the nodal loop semimetal HfP2 using angle resolved photoemission spectroscopy (ARPES) which is supported by our first principles calculations. Our study shows termination dependent surface states in this compound. Our experimental data reveal surface states linked to three unique nodal loops confirmed by theoretical calculation to be topologically non-trivial. This work demonstrates that transition metal dipnictides provide a good platform to study non-trivial topological states protected by nonsymmorphic symmetry.

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  1. Disorder driven multifractality transition in Weyl nodal loops

    cond-mat.dis-nn 2019-08 conditional novelty 7.0 of 10

    Any small disorder turns a clean Weyl nodal loop semimetal into a multifractal semimetal, and at a critical disorder there is a transition to a diffusive metal with exponents nu=1.0 and z=1.9.

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