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Your search keyword '"Kukushkin, I. V."' showing total 26 results
Start Over Author "Kukushkin, I. V." Journal physical review letters
26 results on '"Kukushkin, I. V."'

20. Buhmannet al. reply

Author

Buhnmann, H., primary, Joss, W., additional, Klitzing, K. v., additional, Kukushkin, I. V., additional, Martinez, G., additional, Plaut, A. S., additional, Ploog, K., additional, and Timofeev, V. B., additional

Published
1991
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23. Pseudospin Quantum Hall Ferromagnetism Probed by Electron Spin Resonance.

Author

Shchepetilnikov AV, Khisameeva AR, Andreeva SA, Nikolaev GA, Fedotova YV, Reichl C, Wegscheider W, and Kukushkin IV

Abstract

We study the effect of the pseudospin ferromagnetism with the aid of an electrically detected electron spin resonance in a wide AlAs quantum well containing a high quality two-dimensional electron system. Here, pseudospin emerges as a two-component degree of freedom, that labels degenerate energy minima in momentum space populated by electrons. The built-in mechanical strain in the sample studied imposes a finite "Zeeman" splitting between the pseudospin "up" and "down" states. Because of the anisotropy of the electron spin splitting we were able to independently measure the electron spin resonances originating from the two in-plane valleys. By analyzing the relative resonance amplitudes, we were able to investigate the ferromagnetic phase transitions taking place at integer filling factors of the quantum Hall effect when the magnetic field is tilted. The pseudospin nature of these transitions is demonstrated.

Published
2024
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24. Cyclotron spin-flip excitations in a nu = 1/3 quantum Hall ferromagnet.

Author

Van'kov AB, Kulik LV, Dickmann S, Kukushkin IV, Kirpichev VE, Dietsche W, and Schmult S

Abstract

Inelastic light scattering spectroscopy discloses a novel type of cyclotron spin-flip excitation in a quantum Hall system around the nu = 1/3 filling. The excitation energy follows qualitatively the degree of electron spin polarization, reaching a maximum value at nu = 1/3. This characterizes the new excitation as a nu = 1/3 ferromagnet eigenmode. The mode energy exceeds drastically the theoretical prediction obtained within the renowned single-mode approximation. We develop a new theoretical approach where the basis set is extended by adding a double-exciton component representing the cyclotron magnetoplasmon and spin wave coupled together. This double-mode approximation, inferred to be responsible for substantially reducing the gap between theoretical and experimental results, shows that the cyclotron spin-flip excitation is effectively a four-particle state.

Published
2009
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25. Low-magnetic-field divergence of the electronic g factor obtained from the cyclotron spin-flip mode of the nu=1 quantum Hall ferromagnet.

Author

Van'kov AB, Kulik LV, Kukushkin IV, Kirpichev VE, Dickmann S, Zhilin VM, Smet JH, von Klitzing K, and Wegscheider W

Abstract

We report an inelastic light scattering study of the cyclotron spin-flip mode in the two-dimensional electron system at filling nu=1. The energy of this mode can serve as a probe of the many-body exchange interaction on short length scales. Its magnetic field dependence is compared with predictions based on Hartree-Fock theory. They agree well when including the nonzero width of the electron system. From the measured energies, the exchange enhanced g factor is extracted. It diverges at small fields and differs largely from g factors obtained via transport activation studies.

Published
2006
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26. New type of B-periodic magneto-oscillations in a two-dimensional electron system induced by microwave irradiation.

Author

Kukushkin IV, Akimov MY, Smet JH, Mikhailov SA, von Klitzing K, Aleiner IL, and Falko VI

Abstract

We observe a new type of magneto-oscillations in the photovoltage and the longitudinal resistance of a two-dimensional electron system. The oscillations are induced by microwave radiation and are periodic in magnetic field. The period is determined by the microwave frequency, the electron density, and the distance between potential probes. The phenomenon is accounted for by interference of coherently excited edge magnetoplasmons in the contact regions and offers perspectives for developing new tunable microwave and terahertz detection schemes and spectroscopic techniques.

Published
2004
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