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Friday, August 15 • 08:30 - 10:30
Narrow-Gap Semiconductor III

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Oral: Sen Li
Supercurrent & Multiple Andreev Reflections in an MBE Grown InSb Nanowire Josephson Junction
Co-authors: Ning Kang, Philippe Caroff, Hongqi Xu

Oral: Franz Münzhuber
Exciton Decay Dynamics Controlled by Impurity Occupation in Mn-Doped GaAs
Co-authors: Björn Gieseking, Georgy V. Astakhov, Tobias Kießling, Laurens W. Molenkamp, Wolfgang Ossau, Vladimir Dyakonov

Invited: Sergey Krishtopenko
Many-Body Effects in Narrow-Gap 2D Systems
Co-authors: N/A

In the past years there has been growing interest in many-body effects in 2D systems with spin-orbit interaction (SOI), in which energy-momentum law exhibits strong nonparabolicity.

My report contains theoretical results on electron-electron (e-e) interaction effects in narrow-gap quantum wells (QWs). I will demonstrate how SOI and the mixing between $\Gamma_6$, $\Gamma_7$ and $\Gamma_8$ bands, which are conduction and valence bands in III-V QWs, affects exchange enhancement of quasiparticle g-factor [1,2] (first proposed by Ando and Uemura [3]), many-body renormalization of cyclotron (CR) [4,5] and electron spin resonance (ESR) [5,6] in n-type QWs based on narrow-gap semiconductors. The calculations performed for InAs/AlSb QWs will be compared with experimental data obtained by magnetotransport and THz magnetospectroscopy in these structures.

Exchange renormalization of quasiparticle g-factor and g-factor, extracted from ESR, in direct-band and band-inverted HgTe QWs will possible be discussed.

[1] S. S. Krishtopenko et al. // J. Phys.: Condens. Matter 23, 385601 (2011).
[2] S. S. Krishtopenko et al. // J. Phys.: Condens. Matter 24, 135601 (2012).
[3] T. Ando, Y. Uemura. // J. Phys. Soc. Jpn 37, 1044 (1974).
[4] S.S. Krishtopenko. // J. Phys.: Condens. Matter 25, 365602 (2013).
[5] S.S. Krishtopenko. // J. Phys.: Condens. Matter 25, 105601 (2013).
[6] S.S. Krishtopenko et al. // Phys. Rev. B 87, 155113 (2013).

Oral: Gustavo Dalpian
Magnetic & Electronic Properties of FeGa3
Co-authors: Jorge Osorio-Guillen

Yara Galvão Gobato
Magneto-Photoluminescence Studies of GaBiAs Layers
Co-authors: Anne Rose Hermanson Carvalho, Vanessa Orsi Gordo, Helder Vinicius Avanço Galeti, Marcio Peron Franco de Godoy, Robert Kudrawiec, O M Lemine, Mohamed Henini

Oral: Giti Khodaparast
Magneto-Optical Spectroscopy of Narrow Gap Ferromagnetic Semiconductors
Co-authors: Y. H. Matsuda, D. Saha, G. D. Sanders, C. J. Stanton, B. W. Wessels, X. Liu, J. Furdyna


Session Chairs

J.G. Tischler

Naval Research Laboratory


Sergey Krishtopenko

Postdoctoral Researcher, Institute for Physics of Microstructures, Russian Academy of Sciences

Friday August 15, 2014 08:30 - 10:30
Room 19B

Attendees (6)