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Title: Visualizing discrete Fermi surfaces and possible nodal-line to Weyl state evolution in ZrSiTe

Journal Article · · npj Quantum Materials

Topological nodal line semimetals (TNLSMs) represent a quantum state of topological matter. When the crystal/time-reversal symmetry is broken, a nodal line state is expected to evolve into a Dirac semimetal, a Weyl semimetal, or other topological phases according to theoretical studies. Here, we report scanning tunneling microscopy (STM) based quasiparticle interference (QPI) measurements performed on the surface of TNLSM ZrSiTe single crystal. A discrete Fermi surface with multiple electron/hole pockets and the impurity-induced inter-/intra- pockets scatterings are directly visualized from QPI patterns. Moreover, the degenerated Dirac points at X point evolve into the pairs of Weyl nodes when Fe atoms are deposited, suggesting a possible phase transition from the nodal line to the Weyl state. The calculated band structures and the Weyl points by applying Zeeman splitting energies along x-direction, further confirm the existence of Weyl points in the Fe-doped ZrSiTe induced by the broken of time-reversal symmetry.

Research Organization:
Tulane Univ., New Orleans, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Postdoctoral Innovative Talent Support Program of China; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0014208; BX20200202; 2018YFA0307000; 11574095; 11604106; 21622306; 91545127; 11874022; 12004234
OSTI ID:
1978616
Journal Information:
npj Quantum Materials, Vol. 7, Issue 1; ISSN 2397-4648
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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