Femtosecond terahertz dynamics of cooperative transitions: from charge density waves to polariton condensates

M. Porer; J.-M. Ménard; C. Poellmann; H. Dachraoui; L. Mouchliadis; I. E. Perakis; U. Heinzmann; J. Demsar; K. Rossnagel; E. Galopin; A. Lemaître; A. Amo; J. Bloch; R. Huber

doi:10.1117/12.2219583

13 May 2016 Femtosecond terahertz dynamics of cooperative transitions: from charge density waves to polariton condensates

M. Porer, J.-M. Ménard, C. Poellmann, H. Dachraoui, L. Mouchliadis, I. E. Perakis, U. Heinzmann, J. Demsar, K. Rossnagel, E. Galopin, A. Lemaître, A. Amo, J. Bloch, R. Huber

Author Affiliations +

Proceedings Volume 9835, Ultrafast Bandgap Photonics; 98351H (2016) https://doi.org/10.1117/12.2219583
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

Abstract

Many-body correlation effects in complex quantum systems often lead to phase transitions that bear great technological potential. However, the underlying microscopic driving mechanisms or even the quantum-mechanical properties of the novel ground state often remain elusive. Here we employ phase-locked ultrabroadband terahertz (THz) pulses to disentangle two coexisting orders in the charge density wave phase 1T-TiSe₂ via their individual non-equilibrium multi- THz dynamics. Furthermore, we demonstrate that few-cycle THz pulses can project out the matter part of a transient cold exciton-polariton condensate, providing novel insights into the very nature of this macroscopic quantum state.

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M. Porer, J.-M. Ménard, C. Poellmann, H. Dachraoui, L. Mouchliadis, I. E. Perakis, U. Heinzmann, J. Demsar, K. Rossnagel, E. Galopin, A. Lemaître, A. Amo, J. Bloch, and R. Huber "Femtosecond terahertz dynamics of cooperative transitions: from charge density waves to polariton condensates", Proc. SPIE 9835, Ultrafast Bandgap Photonics, 98351H (13 May 2016); https://doi.org/10.1117/12.2219583

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