Abstract - Physics at Lancaster University

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Scanning Gate Microscopy of Quantum Dots:Fabry-Perrot Interferences and Thermally Induced Pattern of RingsAndrii Kleshchonok, Geneviève Fleury, Jean-Louis PichardService de Physique de l'Etat Condensé (CNRS URA 2464),IRAMIS/SPEC, CEA Saclay, 91191 Gif-sur-Yvette, FranceThermally induced rings can be seen in addition to Fabry-Perrot interference fringes spaced by half theFermi wavelength when one studies the conductance of the interferometer formed in a two dimensionalelectron gas (2DEG) between a nanostructured quantum contact and the charged tip of a scanning gatemicroscope. If the contact is made of a quantum dot with odd number of electrons opened in the middleof a Kondo valley, we show how the location of the rings allows to measure by electron interferometrythe magnetic moment of the dot above the Kondo temperature.
Spin manipulation in moving quantum dots via the spin-orbit interactionAnton Ramsak, Ljubljana UniversityAn exact solution is derived for the wavefunction of an electron in a semiconductorquantum wire with spin–orbit interaction and driven by external time-dependentharmonic confining potential. The formalism allows analytical expressions forvarious quantities to be derived, for example spin and pseudo-spin rotations, energyand occupation probabilities for excited states. It is demonstrated how perfect spinand pseudo-spin flips can be achieved at high frequencies of the order of , theconfining potential level spacing. By an appropriately chosen driving term, spinmanipulation can be exactly performed far into the non-adiabatic regime. Theimplications for spin-polarized emission and spin-dependent transport are alsodiscussed.
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Abstract - Physics at Lancaster University

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