Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 49: Correlated Electrons: Charge Order
TT 49.5: Talk
Wednesday, March 11, 2026, 11:45–12:00, HSZ/0101
Coherent amplitude response in the excitonic insulator Ta2Pd3Te5 — •Anjan Kumar Naralapura Manohara1, Shuhan Wang1, Snehashish Chatterjee2, Chandra Shekhar2, Claudia Felser2, and Stefan Kaiser1 — 1Institute of Solid State and Materials Physics, TU dresden — 2Topological Quantum Chemistry Group, Max Planck Institute for Chemical Physics of Solids, Dresden
The excitonic insulator represents a fascinating electronic phase in which bound electron-hole pairs condense into a macroscopic quantum state. The layered compound Ta2Pd3Te5 has recently emerged as a compelling platform for exploring this elusive phase. A hallmark of such condensate is the presence of collective excitations analogous to the Higgs (amplitude) and Goldstone (phase) modes in superconductors. In this work, we present the experimental fingerprint of a coherent amplitude response in the excitonic insulator phase of Ta2Pd3Te5. Through non-degenerate pump-probe spectroscopy, we identify three low frequency A1g phonons that show strong coupling to the excitonic condensate. We characterise these modes as a function of temperature and excitation fluence to reveal their link to the emergence and dynamics of the excitonic condensate.
Keywords: Excitonic Insulator; Time resolved experiments; Condensation; Hybrid modes; Coherent phonons