C
C. Tietz
Researcher at University of Stuttgart
Publications - 27
Citations - 2780
C. Tietz is an academic researcher from University of Stuttgart. The author has contributed to research in topics: Spectroscopy & Vacancy defect. The author has an hindex of 16, co-authored 26 publications receiving 2547 citations. Previous affiliations of C. Tietz include Free University of Berlin.
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Scanning confocal optical microscopy and magnetic resonance on single defect centers
TL;DR: In this article, the fluorescence of individual nitrogen-vacancy defect centers in diamond was observed with room-temperature scanning confocal optical microscopy, and the centers were photostable, showing no detectable change in their fluorescence emission spectrum as a function of time.
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Single spin states in a defect center resolved by optical spectroscopy
TL;DR: In this article, the authors investigated individual paramagnetic defect centers in diamond nanocrystals by low-temperature high-resolution optical spectroscopy and found narrow fluorescence excitation spectral lines indicating transitions between individual spin sublevels.
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Experimental test of the fluctuation theorem for a driven two-level system with time-dependent rates.
TL;DR: A single defect center in diamond periodically excited by a laser is shown to provide a simple realization for a system obeying a fluctuation theorem for nonthermal noise, which is known from entropy fluctuations caused by thermal noise.
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Measurement of stochastic entropy production.
TL;DR: This work directly measures entropy production of a single two-level system realized experimentally as an optically driven defect center in diamond and demonstrates that the total entropy production obeys various exact relations for finite time trajectories.
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Low-temperature microscopy and spectroscopy on single defect centers in diamond
A. Dräbenstedt,L. Fleury,C. Tietz,Fedor Jelezko,Sergei Ya. Kilin,A. Nizovtzev,Jörg Wrachtrup +6 more
TL;DR: In this paper, the authors investigated individual nitrogen-vacancy defect centers by low-temperature confocal microscopy and fluorescence excitation spectroscopy and found that at temperatures below 90 K the fluorescence intensity of individual centers drastically diminishes because of the population of a metastable singlet state in near resonance with the optically excited state.