Výsledky vyhledávání - "Klitzing, Klaus von"

Inelastic light scattering study of the ν=1 quantum Hall ferromagnet

Autor: Zhuravlev, A. S., Vankov, A. B., Kulik, L. V., Kukushkin, I. V., Kirpichev, V. E., Smet, J. H., Klitzing, Klaus von, Umansky, V., Wegscheider, Werner

We report on an inelastic light scattering study in the two-dimensional electron system at filling factor ν=1. The energy and the inelastic cross section of the cyclotron spin-flip mode are analyzed. The exchange enhanced electronic g factor in the

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Dispersion of the Composite-Fermion Cyclotron-Resonance Mode

Autor: Kukushkin, I. V., Smet, J. H., Schuh, Dieter, Wegscheider, Werner, Klitzing, Klaus von

The dispersion of the composite-fermion cyclotron-resonance mode is measured with an optical detection scheme under the combined excitation of microwave radiation and a surface acoustic wave from an interdigital transducer. The slowly traveling surfa

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Missing conductivity peak in a surface acoustic wave measurement at ν=2/3

Autor: Dini, D., Dunford, R. D., Stern, O., Dietsche, W., Mellor, C. J., Klitzing, Klaus von, Wegscheider, Werner

Surface acoustic waves (SAWs) were used to study the spin transition of the fractional quantum Hall effect at a filling factor of 2∕3. Although very distinct and hysteretic anomalies were observed at the transition in the transport measurements, no

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Low-Magnetic-Field Divergence of the Electronic g Factor Obtained from the Cyclotron Spin-Flip Mode of the ν=1 Quantum Hall Ferromagnet

Autor: Vankov, A. B., Kulik, L. V., Kukushkin, I. V., Kirpichev, V. E., Dickmann, S., Zhilin, V. M., Smet, J. H., Klitzing, Klaus von, Wegscheider, Werner

We report an inelastic light scattering study of the cyclotron spin-flip mode in the two-dimensional electron system at filling ν=1. The energy of this mode can serve as a probe of the many-body exchange interaction on short length scales. Its magne

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Investigations of the νT=1 exciton condensate

Autor: Wiersma, R. D., Lok, J. G. S., Tiermann, L., Dietsche, W., Klitzing, Klaus von, Schuh, Dieter, Wegscheider, Werner

Recent experiments on quantum Hall bilayers in the vicinity of total filling factor 1 (νT=1) have revealed many exciting observations characteristic of a superfluidic exciton condensate. We report on our experimental work involving the νT=1 exciton

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Activated transport in the νT=1 exciton condensate at balanced and imbalanced densities measured in drag and counter-flow configuration

Autor: Wiersma, R. D., Lok, J. G. S., Kraus, Stefan, Dietsche, W., Klitzing, Klaus von, Schuh, Dieter, Bichler, Max, Tranitz, Hans-Peter, Wegscheider, Werner

We observe the total filling factor νT=1 exciton condensate in independently contacted bilayer two-dimensional electron systems in samples with minute tunnel coupling. At balanced electron densities in the layers, we find for both drag and counter-f

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The role of density imbalance in the vT = 1 exciton condensate state for electron bilayer systems

Autor: Wiersma, R. D., Lok, J. G. S., Dietsche, W., Klitzing, Klaus von, Schuh, Dieter, Wegscheider, Werner

We report on our experimental work involving the T = 1 exciton condensate in independently contacted bilayer two-dimensional electron systems. A phase diagram between the weakly coupled ( U = 1/2, L = 1/2) phase and the strongly coupled T = 1 phase i

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Cyclotron spin-flip mode as the lowest-energy excitation of unpolarized integer quantum Hall states

Autor: Kulik, L. V., Kukushkin, I. V., Dickmann, S., Kirpichev, V. E., Vankov, A. B., Parakhonsky, A. L., Smet, J. H., Klitzing, Klaus von, Wegscheider, Werner

The cyclotron spin-flip modes of spin unpolarized integer quantum Hall states (ν=2,4,6) have been studied with inelastic light scattering. The energy of these modes is significantly smaller compared to the bare cyclotron gap. Second-order exchange c

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NMR study of the electron spin polarization in the fractional quantum Hall effect of a single quantum well: Spectroscopic evidence for domain formation

Autor: Stern, O., Freytag, N., Fay, A., Dietsche, W., Smet, J. H., Klitzing, Klaus von, Schuh, Dieter, Wegscheider, Werner

The authors have developed a technique to determine the electron spin polarization in a single GaAs quantum well by combining resistance-detected (RD) nuclear magnetic resonance (NMR) with conventional NMR. We use this method to study the unpolarized

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