We studied and implemented for the first time dynamical decoupling on a single solid-state spin, the spin of a nitrogen-vacancy (NV) center in diamond, and prolonged its coherence time by a factor of 25. Besides its fundamental importance, this achievement constitutes an important advance towards manipulating matter at the level of single spins and opens new possibilities for highly sensitive magnetic sensors, and possibly for qubits for larger scale quantum information processing.
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We developed a global structure optimization method, genetic algorithm, for an efficient prediction of grain- boundary structures. Using this method, we predicted the most stable structures and a number of low-energy metastable structures for Si symmetric tilted grain boundaries with various tilted angles. We show that most of the grain-boundary structures can be described by the structural unit model with the units being the dislocation cores and perfect-crystal fragments (see Fig. 1).
Organometallc nanomaterials hold the promise for molecular hydrogen (H2) storage by providing nearly ideal binding strength to H2 for room-temperature applications. However, synthesizing such materials faces severe setbacks due to the problem of metal clustering. Inspired by a recent experimental breakthrough (J. Am. Chem. Soc.
Spin fluctuations are considered to be one of the candidates that drive a sign-reversed s±- superconducting state in the iron pnictides. In the magnetic scenario, whether the spin fluctuation spectrum exhibits certain unique fine structures is an interesting aspect for theoretical study to understand experimental observations.
Anisotropic Hc2 for the K0.8Fe1.76Se2 single crystals. Solid circles are obtained from the pulsed field radio frequency shift measurements and closed (open) square and triangle symbols are taken from temperature (magnetic field)-dependent resistance measurements. Inset shows the temperature dependence of the magnetic hyperfine field (Bhf).