Short range proximity effect induced by exchange interaction in tunnel-coupled CdTe and (Cd,Mn)Te quantum wells

Kirstein, E.; Kozyrev, N. V.; Afanasiev, M. M.; Mantsevich, V. N.; Krivenko, I. S.; Kalevich, V. K.; Salewski, M.; Chusnutdinow, S.; Wojtowicz, T.; Karczewski, G.; Kusrayev, Yu. G.; Zhukov, E. A.; Yakovlev, D. R.; Bayer, M.

doi:10.1103/physrevb.101.035301

Title: Short range proximity effect induced by exchange interaction in tunnel-coupled CdTe and (Cd,Mn)Te quantum wells

Journal Article · 08 January 2020 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.101.035301 · OSTI ID:1802094

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^[6]; Karczewski, G. ^[6]; Kusrayev, Yu. G. ^[2]; Zhukov, E. A. ^[7];

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Technische Univ. Dortmund (Germany); OSTI
Russian Academy of Sciences (RAS), St. Petersburg (Russia)
Lomonosov Moscow State University (Russia)
Univ. of Michigan, Ann Arbor, MI (United States)
Technische Univ. Dortmund (Germany)
Polish Academy of Sciences (PAS), Krakow (Poland)
Technische Univ. Dortmund (Germany); Russian Academy of Sciences (RAS), St. Petersburg (Russia)

The coherent spin dynamics of electrons in tunnel-coupled CdTe and (Cd,Mn)Te quantum wells (QWs) is studied by time-resolved pump-probe Kerr rotation. The coupled QWs have different thicknesses; the narrow one is doped by Mn²⁺ magnetic ions. A short range proximity effect between them is observed: the Zeeman splitting of electrons in the wide QW is given in addition to the intrinsic electron g factor by the exchange interaction with the Mn²⁺ ions mediated by electron tunneling into the narrow QW. The exchange interaction strength scales with the Cd_0.88Mg_0.12Te barrier thickness separating the QWs. The Kerr rotation signal measured on the wide QW shows two close frequencies of electron spin Larmor precession in a transverse magnetic field. These components have very different spin dephasing times, 50 ps and 1 ns. The two frequencies originate from electrons in the wide QW being either part of an exciton or being resident. The proximity effect of the exciton electron is smaller due to the binding by Coulomb interaction, which decreases the tunneling to the narrow well. The experimental data are in good agreement with model calculations.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: Deutsche Forschungsgemeinschaft (DFG); National Science Centre of Poland (NCN); Russian Foundation for Basic Research (RFBR); USDOE Office of Science (SC)

Grant/Contract Number:: SC0010342

OSTI ID:: 1802094

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 3 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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