Quantum oscillation studies of topological semimetal candidate ZrGeM (M=S, Se, Te)

Abstract

The WHM - type materials (W=Zr/Hf/La, H=Si/Ge/Sn/Sb, M=O/S/Se/Te) have been predicted to be a large pool of topological materials. These materials allow for fine tuning of spin-orbit coupling, lattice constant and structural dimensionality for various combinations of W, H and M elements, thus providing an excellent platform to study how these parameters' tuning affect topological semimetal state. In this work, we report the high field quantum oscillation studies on ZrGeM (M=S, Se, and Te). We have found the first experimental evidence for their theoretically-predicted topological semimetal states. From the angular dependence of quantum oscillation frequency, we have also studied the Fermi surface topologies of these materials. Moreover, we have compared Dirac electron behavior between the ZrGeM and ZrSiM systems, which reveals deep insights to the tuning of Dirac state by spin-orbit coupling and lattice constants in the WHM systems.

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• Coexisted Three-component Bosons and Two-component Weyl Bosons in TiS, ZrSe and HfTe
• Three-component bosons in TiS, ZrSe and HfTe
• Observation of topological nodal-line fermionic phase in GdSbTe
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• Weak Localization and Antilocalization in Nodal-Line Semimetals: Dimensionality and Topological Effects
• Proposal for detecting nodal-line semimetal surface-states with resonant spin-flipped reflection
• Tunable large spin Hall and spin Nernst effects in Dirac semimetals ZrXY (X=Si, Ge; Y=S, Se, Te)
• Observation of Gapless Dirac Surface States in ZrGeTe
• Observation of topological nodal-loop state in RAs3 (R = Ca, Sr)
• Electronic Transport Evidence for Topological Nodal-Line Semimetals of ZrGeSe single crystals
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• Extremely Large Magnetoresistance and Electronic Structure of TmSb
• Chemical pressure effect on the optical conductivity of the nodal-line semimetals ZrSi$Y$ ($Y$=S, Se, Te) and ZrGe$Y$ ($Y$=S, Te)
• Quantum oscillation evidence of topological semimetal phase in ZrSnTe
• Experimental evidence of crystal symmetry protection for the topological nodal line semimetal state in ZrSiS
• Non-trivial topology in a layered Dirac nodal-line semimetal candidate SrZnSb${}_2$ with distorted Sb square nets
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• Magnetic susceptibility of topological semimetals
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• Magnetotransport studies of the Sb square-net compound LaAgSb${}_2$ under high pressure and rotating magnetic fields
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