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O: Fachverband Oberflächenphysik
O 66: Ultrafast electron dynamics at surface and interfaces III
O 66.7: Vortrag
Mittwoch, 11. März 2026, 16:45–17:00, TRE/MATH
Ultrafast Investigation of Competing CDW Orders in LaTe3 — •Francesco Sammartino1, Wibke Bronsch2, Fulvio Parmigiani1,2, and Federico Cilento2 — 1Università degli Studi di Trieste — 2Elettra - Sinctrotrone Trieste
The RTe3 family hosts a rich landscape of charge-density-wave (CDW) phases. All members display a unidirectional CDW aligned along the c-axis, while only the heavier rare-earth compounds develop an additional equilibrium CDW along the a-axis at lower temperature. Intriguingly, recent ultrafast experiments have shown that LaTe3, whose equilibrium state features only the c-axis CDW, can transiently exhibit a rotated CDW component oriented along the a-axis.
Building on time-resolved optical studies that first revealed the emergence of this orthogonal order, we investigated LaTe3 through time-resolved ARPES (TR-ARPES) to track, with momentum resolution, the ultrafast evolution of its electronic structure.
We monitored the melting of the equilibrium c-axis CDW gap and searched for transient modifications of the electronic dispersions along the a-axis that could be linked to the emergence of the rotated order. This study provides direct insight into the nonequilibrium CDW dynamics of LaTe3 and may help clarify the microscopic pathways that enable the formation of the rotated CDW state.
Keywords: Rare - earth tritelluride (RTe3); Charge-Density-Wave (CDW); Coherent phonons; Time Resolved Arpes; Ultrafast dynamics (pump-probe experiment)