Baldini E, Mann A, Borroni S, Arrell C, van Mourik F, Carbone F. A versatile setup for ultrafast broadband optical spectroscopy of coherent collective modes in strongly correlated quantum systems.
STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2016;
3:064301. [PMID:
27990455 PMCID:
PMC5135716 DOI:
10.1063/1.4971182]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/16/2016] [Indexed: 06/06/2023]
Abstract
A femtosecond pump-probe setup is described that is optimised for broadband transient reflectivity experiments on solid samples over a wide temperature range. By combining high temporal resolution and a broad detection window, this apparatus can investigate the interplay between coherent collective modes and high-energy electronic excitations, which is a distinctive characteristic of correlated electron systems. Using a single-shot readout array detector at frame rates of 10 kHz allows resolving coherent oscillations with amplitudes <10-4. We demonstrate its operation on the charge-transfer insulator La2CuO4, revealing coherent phonons with frequencies up to 13 THz and providing access into their Raman matrix elements.
Collapse