Emergent symmetry in TbTe 3 revealed by ultrafast reflectivity under anisotropic strain

We report ultrafast reflectivity measurements of the dynamics of the order parameter of the charge density wave (CDW) in TbTe under anisotropic strain. We observe an increase in the frequency of the amplitude mode with increasing tensile strain along the -axis (which drives the lattice into  >  ,...

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Veröffentlicht in:Reports on progress in physics 2024-10, Vol.87 (10), p.100501
Hauptverfasser: Kim, Soyeun, Orenstein, Gal, Singh, Anisha G, Fisher, Ian R, Reis, David A, Trigo, Mariano
Format: Artikel
Sprache:eng
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Zusammenfassung:We report ultrafast reflectivity measurements of the dynamics of the order parameter of the charge density wave (CDW) in TbTe under anisotropic strain. We observe an increase in the frequency of the amplitude mode with increasing tensile strain along the -axis (which drives the lattice into  >  , with and the lattice constants), and similar behavior for tensile strain along (  >  ). This suggests that both strains stabilize the corresponding CDW order and further support the near equivalence of the CDW phases oriented in - and -axis, in spite of the orthorhombic space group. The results were analyzed within the time-dependent Ginzburg-Landau framework, which agrees well with the reflectivity dynamics. Our study presents an ultrafast approach to assess the stability of phases and order parameter dynamics in strained systems.
ISSN:0034-4885
1361-6633
DOI:10.1088/1361-6633/ad71ee