Termination Dependent Topological Surface States in Nodal Loop Semimetal HfP2

Abstract

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.

arXiv comment7 pages, 4 figures

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• Extremely large magnetoresistance from electron-hole compensation in the nodal loop semimetal ZrP${}_2$
• Complex electronic structure evolution of NdSb across the magnetic transition
• Ultrafast relaxation of acoustic and optical phonons in a topological nodal-line semimetal ZrSiS
• Delocalization of topological surface states by diagonal disorder in nodal loop semimetals
• Emergent impervious band crossing in the bulk in topological nodal line semimetal ZrAs${}_2$
• Dirac state switching in transition metal diarsenides
• Electronic structure in a transition metal dipnictide TaAs2
• Disorder-induced instability of a Weyl nodal loop semimetal towards a diffusive topological metal with protected multifractal surface states