Ultrafast phonon-mediated dephasing of color centers in hexagonal boron nitride probed by electron beams
- URL: http://arxiv.org/abs/2404.09879v1
- Date: Mon, 15 Apr 2024 15:48:06 GMT
- Title: Ultrafast phonon-mediated dephasing of color centers in hexagonal boron nitride probed by electron beams
- Authors: Masoud Taleb, Paul Bittorf, Mximilian Black, Mario Hentschel, Wilfried Sigle, Benedikt Haas, Christoph Koch, Peter A. van Aken, Harald Giessen, Nahid Talebi,
- Abstract summary: We study the dynamics of the electron phonon coupling and phonon mediated dephasing of color centers in hexagonal boron nitride.
We demonstrate an ultrafast dephasing time of only 200 fs and a radiative decay of about 585 fs at room temperature.
This behavior is attributed to efficient electron-beam excitation of coherent phonon polaritons in hexagonal boron nitride.
- Score: 0.45502337445953184
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Defect centers in hexagonal boron nitride have been extensively studied as room temperature single photon sources. The electronic structure of these defects exhibits strong coupling to phonons, as evidenced by the observation of phonon sidebands in both photoluminescence and cathodoluminescence spectra. However, the dynamics of the electron phonon coupling as well as phonon mediated dephasing of the color centers in hexagonal boron nitride remain unexplored. Here, we apply a novel time resolved CL spectroscopy technique to explore the population decay to phonon states and the dephasing time T2 with sub femtosecond time resolution. We demonstrate an ultrafast dephasing time of only 200 fs and a radiative decay of about 585 fs at room temperature, in contrast with all optical time resolved photoluminescence techniques that report a decay of a few nanoseconds. This behavior is attributed to efficient electron-beam excitation of coherent phonon polaritons in hexagonal boron nitride, resulting in faster dephasing of electronic transitions. Our results demonstrate the capability of our sequential cathodoluminescence spectroscopy technique to probe the ultrafast dephasing time of single emitters in quantum materials with sub femtosecond time resolution, heralding access to quantum path interferences in single emitters coupled to their complex environment.
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