<div class="csl-bib-body">
<div class="csl-entry">Zocco, D. A. (2024, April 29). <i>Correlation-driven topological semimetals</i> [Conference Presentation]. 9th International Conference on Superconductivity and Magnetism - 2nd International Conference on Quantum Materials and Technologies, Fethiye - Ölüdeniz, Turkey.</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/224000
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dc.description.abstract
The Weyl-Kondo semimetal (WKSM) state has recently been established experimentally and theoretically [1-3], and evidenced in the heavy fermion compound Ce3Bi4Pd3¬¬ [1,3]. In this state, transport and thermodynamic signatures of topology are strongly amplified, due to the flat dispersion inherent to heavy fermion materials and the pinning of Weyl nodes to the Fermi energy. Heavy fermion compounds are well known for their sensitivity to external control parameters such as magnetic field and pressure, providing exceptional playgrounds for testing the tunability and control of–a priori robust–topological phases. In this talk, I will present two such cases. In Ce3Bi4Pd3 we found that the application of relatively modest magnetic fields suppresses the topological signatures; we attribute this effect to the annihilation of Weyl nodes at a topological quantum phase transition [4]. CeRu4Sn6 has been suggested to be another topological semimetal [5,6]. Interestingly, inelastic neutron scattering experiments revealed that the material is quantum critical without tuning [7]. Our pressure- and magnetic field-tuning investigations reveal a dome-shaped WKSM phase, suggesting that this phase is stabilized by the quantum critical fluctuations [8].
References
[1] S. Dzsaber et al., Phys. Rev. Lett. 118, 246601 (2017)
[2] H.-H. Lai et al., Proc. Natl. Acad. Sci. U.S.A. 115, 93 (2018)
[3] S. Dzsaber et al., Proc. Natl. Acad. Sci. U.S.A. 118, e2013386118 (2021)
[4] S. Dzsaber et al., Nat. Commun. 13, 5729 (2022)
[5] M. Sundermann et al., Sci Rep 5, 17937 (2016)
[6] Y. Xu et al., Phys. Rev. X 7, 011027 (2017)
[7] W. T. Fuhrman et al., Sci. Adv. 7, eabf9134 (2021)
[8] D. M. Kirschbaum et al., in preparation
en
dc.description.sponsorship
FWF - Österr. Wissenschaftsfonds
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dc.description.sponsorship
FWF - Österr. Wissenschaftsfonds
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dc.description.sponsorship
FWF - Österr. Wissenschaftsfonds
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dc.description.sponsorship
European Commission
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dc.language.iso
en
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dc.subject
Kondo semimetal
en
dc.title
Correlation-driven topological semimetals
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dc.type
Presentation
en
dc.type
Vortrag
de
dc.relation.grantno
I 4047-N27
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dc.relation.grantno
F 8600
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dc.relation.grantno
I 5868-N
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dc.relation.grantno
101055088
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dc.type.category
Conference Presentation
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tuw.publication.invited
invited
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tuw.project.title
Extreme Spin-Bahn-Kopplung für neue Quantenzustände
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tuw.project.title
Zentrum für korrelierte Quantenmaterialien und festkörperbasierte Quantensysteme
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tuw.project.title
Quantum phase transitions and collective modes
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tuw.project.title
Correlation-driven metallic topology
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tuw.researchTopic.id
Q6
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tuw.researchTopic.name
Quantum Many-body Systems Physics
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tuw.researchTopic.value
100
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tuw.publication.orgunit
E138-04 - Forschungsbereich Quantum Materials
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tuw.author.orcid
0000-0002-6958-0416
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tuw.event.name
9th International Conference on Superconductivity and Magnetism - 2nd International Conference on Quantum Materials and Technologies
