Direct Visualization of Disorder Driven Electronic Liquid Crystal Phases in Dirac Nodal Line Semimetal GdSbTe
arxiv(2024)
摘要
Electronic liquid crystal (ELC) phases are spontaneous symmetry breaking
states believed to arise from strong electron correlation in quantum materials
such as cuprates and iron pnictides. Here, we report a direct observation of
ELC phases in a Dirac nodal line (DNL) semimetal GdSbxTe2-x. As topological
materials with symmetry protected Dirac or Weyl fermions are mostly weakly
correlated, the discovery of real-space electronic nanostructures displaying
incommensurate smectic charge modulation and intense local nematic order are
anomalous and raise questions on the origin of emergent ELC phases.
Specifically, we demonstrate how chemical substitution generates these symmetry
breaking phases before the system undergoes a charge density wave -
orthorhombic structural transition. We further show how dopants can induce
nematicity via quasiparticle scattering interference. Our results highlight the
importance of impurities in realizing ELC phases and present a new material
platform for exploring the interplay among quenched disorder, topology and
electron correlation.
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