Skip to main content

Research Repository

Advanced Search

Outputs (2395)

Quantum synchronization of a driven self-sustained oscillator (2014)
Journal Article
Walter, S., Nunnenkamp, A., & Bruder, C. (2014). Quantum synchronization of a driven self-sustained oscillator. Physical Review Letters, 112, Article 094102. https://doi.org/10.1103/PhysRevLett.112.094102

Synchronization is a universal phenomenon that is important both in fundamental studies and in technical applications. Here we investigate synchronization in the simplest quantum-mechanical scenario possible, i.e., a quantum-mechanical self-sustained... Read More about Quantum synchronization of a driven self-sustained oscillator.

Sequestering the standard model vacuum energy (2014)
Journal Article
Kaloper, N., & Padilla, A. (2014). Sequestering the standard model vacuum energy. Physical Review Letters, 112(9), Article 091304. https://doi.org/10.1103/PhysRevLett.112.091304

We propose a very simple reformulation of general relativity, which completely sequesters from gravity all of the vacuum energy from a matter sector, including all loop corrections and renders all contributions from phase transitions automatically sm... Read More about Sequestering the standard model vacuum energy.

Evolution of semilocal string networks: large-scale properties (2014)
Journal Article
Achúcarro, A., Avgoustidis, A., Leite, A., Lopez-Eiguren, A., Martins, C., Nunes, A., & Urrestilla, J. (2014). Evolution of semilocal string networks: large-scale properties. Physical Review D, 89(6), Article 063503. https://doi.org/10.1103/PhysRevD.89.063503

We report on a detailed numerical study of the evolution of semilocal string networks, based on the largest and most accurate field theory simulations of these objects to date. We focus on the large-scale network properties, confirming earlier indica... Read More about Evolution of semilocal string networks: large-scale properties.

An antidamping spin–orbit torque originating from the Berry curvature (2014)
Journal Article
Kurebayashi, H., Sinova, J., Fang, D., Irvine, A. C., Skinner, T. D., Wunderlich, J., Novák, V., Campion, R. P., Gallagher, B. L., Vehstedt, E. K., Zârbo, L. P., Výborný, K., Ferguson, A. J., & Jungwirth, T. (2014). An antidamping spin–orbit torque originating from the Berry curvature. Nature Nanotechnology, 9(3), 211-217. https://doi.org/10.1038/nnano.2014.15

Magnetization switching at the interface between ferromagnetic and paramagnetic metals, controlled by current-induced torques, could be exploited in magnetic memory technologies. Compelling questions arise regarding the role played in the switching b... Read More about An antidamping spin–orbit torque originating from the Berry curvature.

Seeing the first light: A study of the Dark and Dim ages (2014)
Thesis
Chapman, E. (2013). Seeing the first light: A study of the Dark and Dim ages. (Dissertation). University College London. https://nottingham-repository.worktribe.com/output/47816244

The Epoch of Reionization (EoR) represents a major phase shift in the history of our Universe. After a long, dark, period of expansion and cooling, the first ionizing sources began to ionize the surrounding hydrogen atoms. These bubbles of ionized hy... Read More about Seeing the first light: A study of the Dark and Dim ages.

Spin-symmetry conversion in methyl rotors induced by tunnel resonance at low temperature (2014)
Journal Article
Zhang, B., Sun, C., Alsanoosi, A. M., Aibout, A., & Horsewill, A. J. (2014). Spin-symmetry conversion in methyl rotors induced by tunnel resonance at low temperature. Journal of Chemical Physics, 140(8), https://doi.org/10.1063/1.4865835

Field-cycling NMR in the solid state at low temperature (4.2 K) has been employed to measure the tunneling spectra of methyl (CH3) rotors in phenylacetone and toluene. The phenomenon of tunnel resonance reveals anomalies in 1H magnetization from whic... Read More about Spin-symmetry conversion in methyl rotors induced by tunnel resonance at low temperature.

Steady-state properties of a driven atomic ensemble with nonlocal dissipation (2014)
Journal Article
Yu, D., Olmos, B., Lesanovsky, I., OLMOS SANCHEZ, B., & YU, D. (2014). Steady-state properties of a driven atomic ensemble with nonlocal dissipation. Physical Review A, 89(2), Article 023616. https://doi.org/10.1103/physreva.89.023616

In a driven dense ensemble of two-level atoms the decay acts in a correlated way on several atoms simultaneously. The competition between the coherent laser excitation and the dipole-dipole interaction induced by the dissipation gives rise to a bimod... Read More about Steady-state properties of a driven atomic ensemble with nonlocal dissipation.

Spin dynamic simulations of solid effect DNP: the role of the relaxation superoperator (2014)
Journal Article
Karabanov, A., Kwiatkowski, G., & Köckenberger, W. (2014). Spin dynamic simulations of solid effect DNP: the role of the relaxation superoperator. Molecular Physics, 112(14), https://doi.org/10.1080/00268976.2014.884287

Relaxation plays a crucial role in the spin dynamics of dynamic nuclear polarisation. We review here two different strategies that have recently been used to incorporate relaxation in models to predict the spin dynamics of solid effect dynamic nuclea... Read More about Spin dynamic simulations of solid effect DNP: the role of the relaxation superoperator.

Imperfections in a two-dimensional hierarchical structure (2014)
Journal Article
Rayneau-Kirkhope, D., Mao, Y., & Farr, R. (2014). Imperfections in a two-dimensional hierarchical structure. Physical Review E, 89(2), Article 023201. https://doi.org/10.1103/PhysRevE.89.023201

Hierarchical and fractal designs have been shown to yield high mechanical efficiency under a variety of loading conditions. Here a fractal frame is optimized for compressive loading in a two-dimensional space. We obtain the dependence of volume requi... Read More about Imperfections in a two-dimensional hierarchical structure.