Macroscopic and microscopic investigation of the microwave induced zero resistance state

• Antragsteller: Dr. Jurgen H. Smet
• Mitantragsteller: Professor Amir Yacoby, Ph.D.
• Fachliche Zuordnung: Physik der kondensierten Materie
• Förderung: Förderung von 2000 bis 2007
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 5246970

In high mobility two-dimensional electron systems, subjected to a strong perpendicular magnetic field and cooled down to millikelvin temperatures, the strong repulsive Coulomb interaction between the electrons forces them to make an alliance with the elementary flux quanta threading the sample in order to minimize the interaction energy. The strong correlation between electrons and flux quanta at commensurate ratios results in the formation of composite fermions and the appearance of fractional quantum Hall states. Experimental probes other than conventional dc-magnetotransport, such as the electronic compressibility, the microwave photoconductivity and the time-resolved transport, will be brought to bear on single and bilayer quantum Hall systems in an attempt to further clarify these correlation effects. Emphasis will be put on addressing unresolved issues about the energy dispersion of composite fermions and to obtain information about the low-energy excitations at the edges.

• DFG-Verfahren: Schwerpunktprogramme
• Teilprojekt zu: SPP 1092: Quanten-Hall-Systeme
• Internationaler Bezug: Israel
• Großgeräte: Erweiterung des Frequenzbereichs des Mikrowellensystems
• Gerätegruppe: 6040 Frequenz-Umformer (statisch) und Hochfrequenzgeneratoren