3D g-factor mapping of single quantum dots at high magnetic fields
Confocal microscopy at cryogenic temperatures has become an essential tool for the study of semiconductor quantum dots. Furthermore if a high magnetic field can be applied to the sample and the sample rotated within the field then even greater information can be obtained from magneto-optical spectroscopy.
In the article, M. Ediger* and R. T. Phillips Cavendish Laboratory, University of Cambridge have developed a novel fibre-based confocal microscope [1] to investigate the properties of nanostructures such as InGaAs quantum dots (QDs) via magneto-photoluminescence (PL).
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Solid State NMR applications
In this article, Dr Hiraki from Gakusyuin University describes the solid state NMR experiments he is doing with his high homogeneity magnets.
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900MHz NMR is a reality
As part of the reliability tests the magnet has been deliberately quenched from full field and successfully brought back to 900 MHz.
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Boosting the sensitivity of NMR spectroscopy using parahydrogen
The low sensitivity of NMR spectroscopy can be enhanced via Para-Hydrogen Induced Polarization (PHIP). The parahydrogen (p-H2) is prepared by cooling H2 to cryogenic temperatures. At liquid N2 temperature, 52% p-H2 is obtained.
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Building a hybrid magnet
Hybrid magnet systems are used to create stable magnetic fields, generally above 30 T, in a relatively large bore (30 mm or greater).
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Dynamic Nuclear Polarisation technology increases the potential of NMR spectroscopy
Dynamic nuclear polarisation offers up to a 10,000-fold signal-to-noise ratio increase and intergrated DNP-NMR’s increased sensitivity provides the possibility of studying low-sensitivity nuclei such as 13C and 15N.
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High Field FT-ICR MS
Mass spectrometry represents a powerful tool in the study of all substances because it provides more information about the composition and structure of a substance from a smaller amount of sample than any other analytical technique.
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Highest ever field for neutron diffraction achieved with split pair superconducting magnets
Researchers of the Sample Environment Group at the Berlin Neutron Scattering Centre (BENSC) of the Hahn-Meitner-Institut in Berlin, Germany, have measured record fields of 17.1 T.
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NMR at 900MHz: TROSY NMR
Following the recent development of the world’s first commercial 900 MHz NMR system, scientists are developing innovative methods of exploiting the advantages that these powerful systems offer.
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Probing the microscopic structure of condensed matter with neutrons
The neutron is an ideal probe for studying both the arrangement and dynamics of atoms, or molecules, in materials. The interaction of neutrons with a nucleus is known exactly, facilitating the direct, unambiguous theoretical interpretation of experimental data.
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Resonant magnetic x-ray scattering under high magnecit fields
The control of thermodynamic variables such as temperature, magnetic field, electric field and pressure is essential for the determination of the complex relationship between correlated microscopic properties of materials.
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Resonant tunnelling of x band electrons in a high magnetic field
Investigating new quantum mechanical properties of artificial layered tunnelling structures which may provide the basis for future semiconductor devices.
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The science of levitation
Magnetic levitation occurs when the force on a diamagnetic object, due to an inhomogeneous magnetic field, is strong enough to balance the body’s weight resulting from the effect of the Earth’s gravity.
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The use of high power microwaves in fusion research
Used primarily to heat and drive electrical current in tokamak plasmas, they are also important for inhibiting the growth of plasma instabilities and optimising plasma formation.
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The use of superconducting magnets in inelastic neutron scattering experiments at ISIS
The physicists in Oxford use the characteristic inelastic neutron scattering signals to determine magnetic fluctuations.
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Investigating the quantum vacuum
Quantum Electrodynamics (QED) predicts that if a linearly polarised light beam is propagated through a transverse magnetic field in a vacuum, the light polarisation state will change from linear to elliptical.
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