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Phonon-induced dephasing of chromium color centers in diamond (2012)

T. Müller, I. Aharonovich, Z. Wang, X. Yuan, S. Castelletto, S. Prawer, and M. Atatüre

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-01

Beschreibung: Author(s): T. Müller, I. Aharonovich, Z. Wang, X. Yuan, S. Castelletto, S. Prawer, and M. Atatüre We report on the coherence properties of single photons from chromium-based color centers in diamond. We use field-correlation and spectral line-shape measurements to reveal the interplay between slow spectral wandering and fast dephasing mechanisms as a function of temperature. The zero-phonon tran... [Phys. Rev. B 86, 195210] Published Fri Nov 30, 2012

Schlagwort(e): Semiconductors I: bulk

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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MIWI2 targets RNAs transcribed from piRNA-dependent regions to drive DNA methylation in mouse prospermatogonia (2018)

Watanabe, T., Cui, X., Yuan, Z., Qi, H., Lin, H.

Springer Nature

In: EMBO Journal

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Publikationsdatum: 2018

Beschreibung: 〈p〉Argonaute/Piwi proteins can regulate gene expression via RNA degradation and translational regulation using small RNAs as guides. They also promote the establishment of suppressive epigenetic marks on repeat sequences in diverse organisms. In mice, the nuclear Piwi protein MIWI2 and Piwi-interacting RNAs (piRNAs) are required for DNA methylation of retrotransposon sequences and some other sequences. However, its underlying molecular mechanisms remain unclear. Here, we show that piRNA-dependent regions are transcribed at the stage when piRNA-mediated DNA methylation takes place. MIWI2 specifically interacts with RNAs from these regions. In addition, we generated mice with deletion of a retrotransposon sequence either in a representative piRNA-dependent region or in a piRNA cluster. Both deleted regions were required for the establishment of DNA methylation of the piRNA-dependent region, indicating that piRNAs determine the target specificity of MIWI2-mediated DNA methylation. Our results indicate that MIWI2 affects the chromatin state through base-pairing between piRNAs and nascent RNAs, as observed in other organisms possessing small RNA-mediated epigenetic regulation.〈/p〉

Print ISSN: 0261-4189

Digitale ISSN: 1460-2075

Thema: Biologie , Medizin

Publiziert von Springer Nature im Namen von The European Molecular Biology Organization (EMBO).

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Cross calibration of deformation potentials and gradient-elastic tensors of GaAs using photoluminescence and nuclear magnetic resonance spectroscopy in GaAs/AlGaAs quantum dot structures (2018)

E. A. Chekhovich, I. M. Griffiths, M. S. Skolnick, H. Huang, S. F. Covre da Silva, X. Yuan, and A. Rastelli

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2018-06-20

Beschreibung: Author(s): E. A. Chekhovich, I. M. Griffiths, M. S. Skolnick, H. Huang, S. F. Covre da Silva, X. Yuan, and A. Rastelli Lattice matched GaAs/AlGaAs epitaxial structures with quantum dots are studied at T = 4.2 K under static uniaxial stress applied either along the [001] or [110] crystal directions. We conduct simultaneous measurements of the spectral shifts in the photoluminescence of the bulk GaAs substrate, which re... [Phys. Rev. B 97, 235311] Published Tue Jun 19, 2018

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Room-temperature storage of quantum entanglement using decoherence-free subspace in a solid-state spin system (2017)

F. Wang, Y.-Y. Huang, Z.-Y. Zhang, C. Zu, P.-Y. Hou, X.-X. Yuan, W.-B. Wang, W.-G. Zhang, L. He, X.-Y. Chang, and L.-M. Duan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-11-01

Beschreibung: Author(s): F. Wang, Y.-Y. Huang, Z.-Y. Zhang, C. Zu, P.-Y. Hou, X.-X. Yuan, W.-B. Wang, W.-G. Zhang, L. He, X.-Y. Chang, and L.-M. Duan We experimentally demonstrate room-temperature storage of quantum entanglement using two nuclear spins weakly coupled to the electronic spin carried by a single nitrogen-vacancy center in diamond. We realize universal quantum gate control over the three-qubit spin system and produce entangled states... [Phys. Rev. B 96, 134314] Published Tue Oct 31, 2017

Schlagwort(e): Dynamics, dynamical systems, lattice effects

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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SRT research of the crystal defects on the TGT synthesized diamond doped with boron and phosphorus (2018)

W L Yu, X P Jia, Q X Yuan and W X Huang

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2018-02-03

Beschreibung: Crystal defects of two synthesized diamonds doped with boron and phosphorus are compared by synchrotron radiation topography (SRT). The crystal defects in the specimen are mainly dislocations. The dislocations are assembled in bundles in the cone-shape and distributed in the directions approximately towards to and . The Burgers vectors of most of the dislocations are parallel to [202] and oblique to the dislocations, showing that the dislocations are of mixed type. The features of the crystal defects are quite different in several aspects compared with the diamonds without phosphorous doping. The ionic radius of phosphorous is 118.75 percent larger than that of carbon and intensive distortion may occur near the phosphorous ions. The dislocations thus originated in bundles to release the stress caused by the phosphorous doping.

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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Designing electromechanical metamaterial with full nonzero piezoelectric coefficients (2019)

Yang, J., Li, Z., Xin, X., Gao, X., Yuan, X., Wang, Z., Yu, Z., Wang, X., Zhou, J., Dong, S.

American Association for the Advancement of Science (AAAS)

In: Science Advances

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Publikationsdatum: 2019

Beschreibung: 〈p〉Designing topological and geometrical structures with extended unnatural parameters (negative, near-zero, ultrahigh, or tunable) and counterintuitive properties is a big challenge in the field of metamaterials, especially for relatively unexplored materials with multiphysics coupling effects. For natural piezoelectric ceramics, only five nonzero elements in the piezoelectric matrix exist, which has impeded the design and application of piezoelectric devices for decades. Here, we introduce a methodology, inspired by quasi-symmetry breaking, realizing artificial anisotropy by metamaterial design to excite all the nonzero elements in contrast to zero values in natural materials. By elaborately programming topological structures and geometrical dimensions of the unit elements, we demonstrate, theoretically and experimentally, that tunable nonzero or ultrahigh values of overall effective piezoelectric coefficients can be obtained. While this work focuses on generating piezoelectric parameters of ceramics, the design principle should be inspirational to create unnatural apparent properties of other multiphysics coupling metamaterials.〈/p〉

Digitale ISSN: 2375-2548

Thema: Allgemeine Naturwissenschaft

Publiziert von American Association for the Advancement of Science (AAAS)

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