Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 118, Issue 44, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2111855118
Keywords
Weyl semimetals; ferroelectric order; Nernst effect; Berry curvature
Categories
Funding
- Core Research for Evolutional Science and Technology (CREST) [JPMJCR16F1]
- Japan Science and Technology Agency (JST)
- Precursory Research for Embryonic Science and Technology, JST [JPMJPR17I3]
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The study introduces a ferroelectric nonmagnetic Weyl semimetal based on indium-doped Pb1-xSnxTe alloy, with adjustable ferroelectric strength by tuning the indium doping level and Sn/Pb ratio. Utilizing the Nernst effect under magnetic fields as an experimental probe, it demonstrates the generation of Berry curvature through the redistribution of Weyl nodes.
The quest for nonmagnetic Weyl semimetals with high tunability of phase has remained a demanding challenge. As the symmetry-breaking control parameter, the ferroelectric order can be steered to turn on/off the Weyl semimetals phase, adjust the band structures around the Fermi level, and enlarge/shrink the momentum separation of Weyl nodes which generate the Berry curvature as the emergent magnetic field. Here, we report the realization of a ferroelectric nonmagnetic Weyl semimetal based on indium-doped Pb1-xSnxTe alloy in which the underlying inversion symmetry as well as mirror symmetry are broken with the strength of ferroelectricity adjustable via tuning the indium doping level and Sn/Pb ratio. The transverse thermoelectric effect (i.e., Nernst effect), both for out-of-plane and in-plane magnetic field geometry, is exploited as a Berry curvature-sensitive experimental probe to manifest the generation of Berry curvature via the redistribution of Weyl nodes under magnetic fields. The results demonstrate a clean, nonmagnetic Weyl semimetal coupled with highly tunable ferroelectric order, providing an ideal platform for manipulating the Weyl fermions in nonmagnetic systems.
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