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Marcin Matusiak1, J R Cooper2, Dariusz Kaczorowski1

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Researchers studied the thermoelectric power of single-crystalline ZrSiS, a topological nodal-line semimetal. Thermoelectric power revealed quantum oscillations from unique electronic bands, confirming its non-trivial topology and suggesting new study methods for topological semimetals.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Topological semimetals feature band crossings protected by topology.
  • These materials have potential applications in spintronics, optoelectronics, quantum computing, and energy harvesting.
  • ZrSiS is a candidate topological nodal-line semimetal.

Purpose of the Study:

  • To investigate the thermoelectric power of single-crystalline ZrSiS.
  • To probe quantum oscillations and electronic band structures in ZrSiS.
  • To confirm the topological nature of ZrSiS and explore its properties.

Main Methods:

  • Measurement of thermoelectric power in single-crystalline ZrSiS.
  • Analysis of quantum oscillations at temperatures up to 100 K.
  • Characterization of electronic band dispersion and Berry phase.

Main Results:

  • Thermoelectric power measurements revealed multiple quantum oscillations in ZrSiS.
  • Two distinct oscillations originated from 3D and 2D electronic bands.
  • These bands exhibited linear dispersion and an additional Berry phase, consistent with non-trivial topology.

Conclusions:

  • Thermoelectric power is a sensitive probe for studying topological semimetals like ZrSiS.
  • The findings provide further insights into the electronic properties of ZrSiS.
  • This study suggests a novel approach for investigating other topological semimetals.