Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.93: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Temperature dependence of the bandgap of 28Si and its use as time-resolved, high precision thermometerEduard Sauter1, Nicolay V. Abrosimov2, •Jens Hübner1, and Michael Oestreich11Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — 2Leibniz-Institut für Kristallzüchtung, Max-Born-Straße 2, 12489 Berlin, Germany

We measure by high resolution absorption spectroscopy of the extremely narrow donor bound trion 28Si:P transition the precise temperature dependence of the indirect bandgap of isotopically purified 28Si in helium exchange gas in the regime from 0.1 K to 2 K. The measurements evidence that the trion frequency can be used as an efficient, contactless, local temperature sensor with a demonstrated time-resolution of a few microseconds. Furthermore, the all-optical sensor is also quite sensitive to changes of the local electric field and of the helium cooling gas pressure allowing detailed studies of the complex 28Si:P system dynamics after perturbations.

[1] M. Beck, N. V. Abrosimov, J. Hübner, and M. Oestreich, Phys. Rev. B, 99, 245201 (2019).
[2] E. Sauter, N. V. Abrosimov, J. Hübner, and M. Oestreich, Phys. Rev. Lett. 126, 137402 (2021).

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