Multichannel photodiode detector for ultrafast optical spectroscopy

Mertelj, T.; Vujičić, Nataša; Borzda, Tetiana; Vaskivskyi, Igor; Pogrebna, A.; Mihailović, D.

doi:10.1063/1.4903871

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2019

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“…The polarization of the probe photons was rotated by a broadband half waveplate and the beam was focused on the sample by a pair of achromatic lenses. The reflected beam was dispersed by a transmission grating and entered a 48-channel silicon PIN diode array [21].…”

Section: Methodsmentioning

confidence: 99%

Ultrafast Carrier Dynamics in an Organic Superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br by Spectrally Resolved Pump-Probe Spectroscopy

Tsuchiya

Mertelj

Mihailović

et al. 2019

J Supercond Nov Magn

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In this work, spectrally-resolved optical pump probe measurements were carried out on strongly correlated organic superconductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br. We find two different types of carrier relaxation dynamics, one of which appears at 1.82 eV and 1.94 eV, and another at 2.17 eV. The former is characterized by short decay time ∼ 1 -2 ps and appears below ∼ 60 K. From the comparison with the previous studies, the dynamics arises from the photoinduced pseudogap (PG) formation of the partially-appeared Mott phase. The latter has long relaxation time ∼ 9 ps at 5 K and developed as temperature decreases below 30 K. The slow dynamics is consistent with appearance of superconducting (SC) gap. Such separate observation of PG and SC dynamics enables us to proceed further investigation of a relationship between them.

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Section: Methodsmentioning

confidence: 99%