Observation of linear-polarization-sensitivity in the microwave-radiation-induced magnetoresistance oscillations

In the quasi two-dimensional GaAs/AlGaAs system, we investigate the effect of rotating \textit{in-situ} the electric field of linearly polarized microwaves relative to the current, on the microwave-radiation-induced magneto-resistance oscillations. We find that the frequency and the phase of the photo-excited magneto-resistance oscillations are insensitive to the polarization. On the other hand, the amplitudes of the magnetoresistance oscillations are remarkably responsive to the relative orientation between the microwave antenna and the current-axis in the specimen. The results suggest a striking linear-polarization-sensitivity in the radiation-induced magnetoresistance oscillations.Comment: 4 figures, 5 page

AMS-Qualifikations-Barometer (17): Green Jobs und Green Skills. Neue Informationen zu Green Jobs und Green Skills im AMS-Qualifikations-Barometer - www.ams.at/qualifikationsbarometer

Die "Green Jobs & Green Skills"-Seiten im AMS-Qualifikations-Barometer, das im Auftrag des AMS Österreich, Abt. Arbeitsmarktforschung und Berufsinformation, von der 3s Unternehmensberatung und dem Institut für Bildungsforschung der Wirtschaft (ibw) erstellt wird, wurden 2013 vor dem Hintergrund der international diskutierten Ökologisierung der Wirtschaft - und dem damit verbundenen Strukturwandel des Arbeitsmarktes - entwickelt. Die neuen "Grünen Seiten" hinterfragen den Beschäftigungsmotor "Umweltwirtschaft" kritisch und beleuchten Green Jobs auf der Ebene von acht Berufsbereichen - von Bau über Landwirtschaft bis Wissenschaft. Im Fokus stehen Daten zur Umweltbeschäftigung, zu den Beschäftigungspotenzialen, zu zentralen Nachhaltigkeitsaspekten und Nachhaltigkeitstrends in den jeweiligen Berufsbereichen, wobei im Besonderen auch Green Skills (z. B. in Form "grüner" werdender Berufe) sowie Aspekte der Arbeitsplatzqualität diskutiert werden

Decoherence and single electron charging in an electronic Mach-Zehnder interferometer

We investigate the temperature and voltage dependence of the quantum interference in an electronic Mach-Zehnder interferometer using edge channels in the integer quantum-Hall-regime. The amplitude of the interference fringes is significantly smaller than expected from theory; nevertheless the functional dependence of the visibility on temperature and bias voltage agrees very well with theoretical predictions. Superimposed on the Aharonov-Bohm (AB) oscillations, a conductance oscillation with six times smaller period is observed. The latter depends only on gate voltage and not on the AB-phase, and may be related to single electron charging.Comment: 4 pages, 6 figures, discussion of charging effect change

Electric-dipole-induced spin resonance in a lateral double quantum dot incorporating two single domain nanomagnets

On-chip magnets can be used to implement relatively large local magnetic field gradients in na- noelectronic circuits. Such field gradients provide possibilities for all-electrical control of electron spin-qubits where important coupling constants depend crucially on the detailed field distribution. We present a double quantum dot (QD) hybrid device laterally defined in a GaAs / AlGaAs het- erostructure which incorporates two single domain nanomagnets. They have appreciably different coercive fields which allows us to realize four distinct configurations of the local inhomogeneous field distribution. We perform dc transport spectroscopy in the Pauli-spin blockade regime as well as electric-dipole-induced spin resonance (EDSR) measurements to explore our hybrid nanodevice. Characterizing the two nanomagnets we find excellent agreement with numerical simulations. By comparing the EDSR measurements with a second double QD incorporating just one nanomagnet we reveal an important advantage of having one magnet per QD: It facilitates strong field gradients in each QD and allows to control the electron spins individually for instance in an EDSR experi- ment. With just one single domain nanomagnet and common QD geometries EDSR can likely be performed only in one QD