Spectral Diffusion in Electron Resonance Lines

Mims, W. B.; Nassau, K.; McGee, J.D.

doi:10.1103/physrev.123.2059

Cited by 216 publications

(68 citation statements)

References 18 publications

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“…The decrease of the linewidth in fields up to 2.25 T is about 1 kHz and can be explained by a decrease in the dephasing induced by magnetic defects. In the limit that the flip rate of these defects is fast compared to the time scale of the echo measurements, the Eu 3+ linewidth can be approximated by the expression [54,55] …”

Section: Magnetic Field Dependence Of the Homogeneous Linewidthsmentioning

confidence: 99%

Dephasing mechanisms of optical transitions in rare-earth-doped transparent ceramics

et al. 2016

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We identify and analyze dephasing mechanisms that broaden the optical transitions of rare-earth ions in randomly oriented transparent ceramics. The study examines the narrow 7 F0 ↔ 5 D0 transition of Eu 3+ dopants in a series of Y 2 O 3 ceramic samples prepared under varying conditions. We characterize the temperature and magnetic field dependence of the homogeneous linewidth, as well as long-term spectral diffusion on time scales up to 1 s. The results highlight significant differences between samples with differing thermal treatments and Zr 4+ additive concentrations. In particular, several distinct magnetic interactions from defect centers are observed, which are clearly distinguished from the broadening due to interactions with two-level systems and phonons. By minimizing the broadening due to the different defect centers, linewidths of the order of 4 kHz are achieved for all samples. The linewidths are limited by temperature-dependent interactions and by an interaction that is yet to be identified. Although the homogeneous linewidth can be narrowed further in these ceramic samples, the broadening is now comparable to the linewidths achieved in rare-earth-ion-doped single crystals. Thus, this work emphasizes the usefulness of studying ceramics to gain insights into dephasing mechanisms relevant to single crystals and suggests that ceramics may be an interesting alternative for applications in classical and quantum information processing.

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Section: Magnetic Field Dependence Of the Homogeneous Linewidthsmentioning

confidence: 99%

Dephasing mechanisms of optical transitions in rare-earth-doped transparent ceramics

et al. 2016

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“…Later, Klauder and Anderson 4 used a Lorentzian distribution function instead in order to account for a power law time dependence observed in experiments by Mims and Nassau. 3 …”

mentioning

confidence: 99%

Quantum theory for electron spin decoherence induced by nuclear spin dynamics in semiconductor quantum computer architectures: Spectral diffusion of localized electron spins in the nuclear solid-state environment

2006

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We consider the decoherence of a single localized electron spin due to its coupling to the lattice nuclear spin bath in a semiconductor quantum computer architecture. In the presence of an external magnetic field and at low temperatures, the dominant decoherence mechanism is the spectral diffusion of the electron spin resonance frequency due to the temporally fluctuating random magnetic field associated with the dipolar interaction induced flip-flops of nuclear spin pairs. The electron spin dephasing due to this random magnetic field depends intricately on the quantum dynamics of the nuclear spin bath, making the coupled decoherence problem difficult to solve. We provide a formally exact solution of this non-Markovian quantum decoherence problem which numerically calculates accurate spin decoherence at short times, which is of particular relevance in solid-state spin quantum computer architectures. A quantum cluster expansion method is developed, motivated, and tested for the problem of localized electron spin decoherence due to dipolar fluctuations of lattice nuclear spins. The method is presented with enough generality for possible application to other types of spin decoherence problems. We present numerical results which are in quantitative agreement with electron spin echo measurements in phosphorus doped silicon. We also present spin echo decay results for quantum dots in GaAs which differ qualitatively from that of the phosphorus doped silicon system. Our theoretical results provide the ultimate limit on the spin coherence (at least, as characterized by Hahn spin echo measurements) of localized electrons in semiconductors in the low temperature and the moderate to high magnetic field regime of interest in scalable semiconductor quantum computer architectures.

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“…Hyperfine sub-level correlation (HYSCORE) spectroscopy is a 2D spectroscopy method based on the same principles. While some of these methods were developed in the 1960s [70], only a small number of groups worked the field, because of the expensive instrumentation, the lack of suitable microwave components and slow digital electronics. It was not until commercial development, first by Varian Associates and then extensively by Bruker BioSpin, that this powerful technology was exploited to the fullest.…”

Section: Metalloproteins and Metal Cluster Containing Systemsmentioning

confidence: 99%

The evolution of biomedical EPR (ESR)

Berliner

2017

BSI

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Abstract. Since the first EPR/ESR spectrum of a paramagnetic substance was published over 70 years ago, the technical improvements did not occur until after/during World War II with the advent of radar technology. The approaches to biomedical problems started somewhat later with the real burst of activity starting after the birth of the spin label technique about 50 years ago. The applications to proteins, then membranes and nucleic acids, and later applications to cells and eventually in-vivo on small animals and now humans has led EPR/ESR to finally being recognized as a uniquely powerful technique in the toolbox of techniques probing macromolecules and their interactions, free radical biology and its eventual value as a diagnostic technique. This article gives an overview of EPR/ESR studies of biomedically related systems, including proteins and enzymes. It presents a very personal historical perspective, briefly reviews the origins of the technique and reflects on possible future directions. As with NMR, advances in molecular biology and technology drastically changed the nature and focus of the technique, particularly the site directed spin labeling method that has been invaluable in determining protein and macromolecular structure by both EPR and NMR.

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Spectral Diffusion in Electron Resonance Lines

Cited by 216 publications

References 18 publications

Dephasing mechanisms of optical transitions in rare-earth-doped transparent ceramics

Dephasing mechanisms of optical transitions in rare-earth-doped transparent ceramics

Quantum theory for electron spin decoherence induced by nuclear spin dynamics in semiconductor quantum computer architectures: Spectral diffusion of localized electron spins in the nuclear solid-state environment

The evolution of biomedical EPR (ESR)

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