A5035334682- Quantum and electron transport phenomena
- Nuclear physics research studies
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
- Nuclear Physics and Applications
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Atomic and Molecular Physics
- Semiconductor Quantum Structures and Devices
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Electronic and Structural Properties of Oxides
- Quantum Chromodynamics and Particle Interactions
- Quantum, superfluid, helium dynamics
- Surface and Thin Film Phenomena
- Mechanical and Optical Resonators
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Memory and Neural Computing
- Radiation Therapy and Dosimetry
- Quantum Information and Cryptography
- Magnetic and transport properties of perovskites and related materials
- Molecular Junctions and Nanostructures
- Atomic and Subatomic Physics Research
- ZnO doping and properties
- Magneto-Optical Properties and Applications
University of Cambridge
2010-2020
University of Leeds
2017
Cavendish Hospital
2003-2014
Cambridge Microelectronics (United Kingdom)
2010
Australian Research Council
2007-2009
UNSW Sydney
2005-2009
Centre for Quantum Computation and Communication Technology
2005-2009
Quantum (Australia)
2007-2008
Atomic Energy (Canada)
1973-1987
Oberlin College
1971-1979
Two general procedures for the measurement and analysis of angular correlations gamma radiations from nuclear reactions are described which have wide applications in spectroscopy determination spins gamma-ray multipolarities. Cases can be studied by these methods when reaction proceeds through a compound state too complex to allow usual made, example where several levels overlap or direct interaction is dominant. The basis exploit simplifications brought about making reacting system axially...
An enhancement in Brillouin light scattering of optical photons with magnons is demonstrated magneto-optical whispering gallery mode resonators tuned to a triple-resonance point. This occurs when both the input and output modes are resonant those resonator, separation given by ferromagnetic resonance frequency. The identification excitation specific allows us gain clear understanding mode-matching conditions. A selection rule due wave vector matching leads an intrinsic single-sideband...
Over the past two decades, research of (Ga,Mn)As has led to a deeper understanding relativistic spin-dependent phenomena in magnetic systems. It also discoveries new effects and demonstrations unprecedented functionalities experimental spintronic devices with general applicability wide range materials. This is review basic material properties that make favorable test-bed system for spintronics discussion contributions studies context device concepts. Special focus on spin-orbit coupling...
Quantum computation requires a qubit-specific measurement capability to readout the final state of individual qubits. Promising solid-state architectures use external electrometers but these can be replaced by more compact element, an in situ gate sensor. Gate-sensing couples qubit resonant circuit via and probes qubit's radiofrequency polarizability. Here we investigate ultimate performance such scheme noise sources that limit its operation. We find charge sensitivity 37 μe Hz−1/2, best...
We demonstrate that yttrium iron garnet microspheres support optical whispering gallery modes similar to those in non-magnetic dielectric materials. The direction of the ferromagnetic moment tunes both resonant frequency via Voigt effect as well degree polarization rotation Faraday effect. An understanding magneto-optical coupling modes, where propagation rotates with respect magnetization, is fundamental emerging field cavity optomagnonics.
We demonstrate that an antiferromagnet can be employed for a highly efficient electrical manipulation of ferromagnet. In our study we use detection technique the ferromagnetic resonance driven by in-plane ac-current in NiFe/IrMn bilayer. At room temperature, observe antidamping-like spin torque acting on NiFe ferromagnet, generated current through IrMn antiferromagnet. A large enhancement torque, characterized effective spin-Hall angle exceeding most heavy transition metals, correlates with...
${\mathrm{He}}^{3}$-induced reactions in carbon have been studied for bombarding energies the range 1.0 to 3.0 Mev. Absolute excitation curves obtained proton groups leading first three states ${\mathrm{N}}^{14}$ and neutron group ${\mathrm{O}}^{14}$ ground state; these show pronounced resonance structure corresponding levels ${\mathrm{O}}^{15}$. Angular distributions measured at seven different protons four neutrons. These are not directly explicable as resulting from either compound...
Received 2 September 1958DOI:https://doi.org/10.1103/PhysRevLett.1.251©1958 American Physical Society
We demonstrate the long range strong coupling of magnetostatic modes in spatially separated ferromagnets mediated by a microwave frequency cavity. Two spheres yttrium iron garnet are embedded cavity and their probed using dispersive measurement technique. find they strongly coupled to each other even when detuned from modes. investigate dependence magnet-magnet on detuning $\Delta$, $1/\Delta$ also characteristic cavity-coupled superconducting qubits. Dark states system observed, ascribed...
We demonstrate, at room temperature, the strong coupling of fundamental and non-uniform magnetostatic modes an yttrium iron garnet ferrimagnetic sphere to electromagnetic a co-axial cavity. The well-defined field profile within cavity yields specific strength for each mode. experimentally measure different and, by calculating expected strengths, we are able identify themselves.
We report the dispersive readout of spin state a double quantum dot formed at corner states silicon nanowire field-effect transistor. Two face-to-face top-gate electrodes allow us to independently tune charge occupation system down few-electron limit. measure stability in DC transport as well dispersively via in-situ gate-based radio frequency reflectometry, where one electrode is connected resonator. The latter removes need for external sensors computing architectures and provides compact...
We demonstrate the dispersive measurement of ferromagnetic resonance in a yttrium iron garnet sphere embedded within microwave cavity. The reduction longitudinal magnetization at is measured as frequency shift cavity mode coupled to sphere. This result intrinsic nonlinearity dynamics, indicating promising route towards experiments magnon quantum electrodynamics.
Reaction thresholds have been studied for (p,n) reactions on B 11 , F 19 Al 27 Si 30 P 31 K 39 Ni 58 and 60 . Using the C 13 (p,n)N Cu 65 (p,n)Zn 66 thresholds, which previously measured with precision, to calibrate magnetic beam analyzer of tandem accelerator, H 2 (O 16 ,n)F 17 threshold establish linearity this calibration an equivalent proton energy 14.57 Mev, energies 3.019±0.004, 4.229±0.006, 5.800±0.008, 5.174±0.030, 6.456±0.020, 7.227±0.070, 9.480±0.025, 7.016±0.015 respectively,...
Quantum mechanical effects induced by the miniaturization of complementary metal-oxide-semiconductor (CMOS) technology hamper performance and scalability prospects field-effect transistors. However, those quantum effects, such as tunnelling coherence, can be harnessed to use existing CMOS for information processing. Here, we report observation coherent charge oscillations in a double dot formed silicon nanowire transistor detected via its dispersive interaction with radio-frequency resonant...
We report the demonstration of a silicon radio-frequency single electron transistor. The island is defined by electrostatically tunable tunnel barriers in narrow channel field effect Charge sensitivities better than 10μe∕Hz are demonstrated at megahertz bandwidth. These results demonstrate that may be used to fabricate fast, sensitive electrometers.