New Research on Semiconductors
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Molybdenum disulphide, hexagonal boron nitride and other materials yet to be discovered will be used to build the electronics of the future.
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Our study of low dimensional electron systems has led to the observation of dramatic effects on the conduction and optical response of high mobility electron systems at very low temperatures and high magnetic fields, caused by electron-electron interactions. The group has developed considerable expertise in optical spectroscopy thermodynamic measurements and in electrical conductivity measurements which forms the basis for several of the projects described below.
The list is not exhaustive, but is intended to give some idea of the nature of the experimental work on offer to students interested in a PhD in experimental semiconductor physics: Optical and transport studies of the integer and fractional quantum Hall effects are being undertaken at temperatures down to 20mK, in magnetic fields of up to 17T. Under these extremes of temperature and field, the two-dimensional electron gases studied condense into a quantum fluid state.
Magnetoresistance measurements reveal a rich spectrum of quasiparticle excitations the fractional quantum Hall effect , and the luminescence from electrons in this state is a powerful probe of these quasiparticles. At the extremes of our experimental capabilities there are clear signs in the two-dimensional electrons' luminescence of the formation of another type of electronic state, tentatively identified as an electron solid.
We are currently extending our investigations of this solid state to 2D systems of holes, in which we expect to be able to examine the transition region between classical and quantum solid. We have developed a new capability to perform magnetization measurements at millikelvin temperatures and high magnetic fields. The technique of torsion magnetometery yields direct thermodynamic information about the phases of matter that form in this regime, and also represents a contact-less measurment of the quantum Hall effect. Investigations are underway of the properties of electrons confined to less than two dimensions: quantum wires and quantum dots.
These structures have enormous device potential and their physics is particularly interesting because the confinement of electrons in them mimics the confinement of electrons in nature: a quantum dot for instance behaves something like an atom.
Semiconductor Materials, Devices & Nanostructures | University of Oxford Department of Physics
The experiments performed at Exeter measure the electronic density of states in these structures and the effects of reduced dimensionality on electron-electron interactions. Transistor structures are convenient objects in which different conduction mechanisms can be studied. In different transistors we investigate the fundamental properties of the metal-insulator transition realised by the variation of the electron concentration or magnetic field. One phenomenon of our interest is quantum interference of electrons. It governs the conductance of semiconductors at low temperatures and is responsible for a number of unusual effects such as negative magnetoresistance: the increase of the conductance with magnetic field.
We were the first to observe this effect in the hopping regime of conduction and now our aim is to understand the origin of this negative magnetoresistance at ultra low temperatures where it becomes 'giant': at small magnetic fields the conductance increases by several orders of magnitude. If the transistor size is decreased to sub-micron its low temperature conductance is not averaged over random impurity positions. This gives rise to mesoscopic effects: any smooth dependence for a large sample becomes fluctuating in a small device.
These fluctuations are very reproducible and reflect the exact impurity configuration of the sample - its 'fingerprint'. We study these fluctuations to understand elementary electron processes involved in the conduction and noise of semiconductors. The journal of physical chemistry letters 9 Enter the terms you wish to search for.
Research groups in this theme. People Laura Herz Professor of Physics. Michael Johnston Professor of Physics.
Robin Nicholas Professor of Physics. Henry Snaith Professor of Physics. James Ball Postdoctoral Research Assistant. Grey Christoforo Postdoctoral Research Assistant.
Semiconductor Physics Research Group
Pascal Kaienburg Postdoctoral Research Assistant. Jongchul Lim Postdoctoral Research Assistant. Ashley Marshall Postdoctoral Research Assistant. Pabitra Nayak Postdoctoral Research Assistant. Jay Patel Postdoctoral Research Assistant. Alexandra Ramadan Postdoctoral Research Assistant.
Nobuya Sakai Postdoctoral Research Assistant. Adam Wright Junior Research Fellow.
The Latest in Research
Bernard Wenger Senior Researcher. Olivia Ashton Graduate Student. Juliane Borchert Graduate Student.
Markus Dollmann Graduate Student. Elisabeth Duijnstee Graduate Student. Hannah Eggimann Graduate Student.