Research output: Contribution to journal › Article › peer-review
Trion magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wells. / Кавокин, Кирилл Витальевич; Godejohann, F.; Ахмадулин, Рустам; Yakovlev, Dmitrii; Akimov, I.A.; Kusraev, Yu G.; Karczewski, Grzegorz; Wojtowicz, Tomasz; Bayer, Manfred; Namozov, B.
In: Physical Review B-Condensed Matter, Vol. 106, No. 19, 195305, 18.11.2022.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Trion magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wells
AU - Кавокин, Кирилл Витальевич
AU - Godejohann, F.
AU - Ахмадулин, Рустам
AU - Yakovlev, Dmitrii
AU - Akimov, I.A.
AU - Kusraev, Yu G.
AU - Karczewski, Grzegorz
AU - Wojtowicz, Tomasz
AU - Bayer, Manfred
AU - Namozov, B.
N1 - Publisher Copyright: © 2022 American Physical Society.
PY - 2022/11/18
Y1 - 2022/11/18
N2 - A trion magnetic polaron formed by the exchange interaction of a positively charged exciton (trion) with localized spins of Mn2+ ions is found experimentally in a 4-nm-wide Cd0.98Mn0.02Te/Cd0.78Mn0.02Mg0.2Te quantum well containing resident holes. The experiment is performed at a temperature of 1.6 K using resonant excitation of the trion with circularly polarized light. The trion is formed from a resident hole, which is in a hole magnetic polaron state, and a photogenerated electron-hole pair. The dynamical evolution from the hole magnetic polaron to the trion magnetic polaron is accompanied by a spin flip of the electron, which results in negative circular polarization of the photoluminescence. The degree of circular polarization reaches -8% at zero magnetic field and strongly decreases in transverse magnetic fields exceeding 0.2 T. Our model considerations show that different localization sizes of the resident and photogenerated holes and the resulting difference in their exchange interaction with the Mn2+ spins maintains Mn spin polarization. The resulting exchange field of Mn acting on the electron provides a robust spin polarization of the trion magnetic polaron. We evaluate the electron exchange energy in the T+MP to be 0.19 meV, and the T+MP binding energy to be about 0.5-1 meV.
AB - A trion magnetic polaron formed by the exchange interaction of a positively charged exciton (trion) with localized spins of Mn2+ ions is found experimentally in a 4-nm-wide Cd0.98Mn0.02Te/Cd0.78Mn0.02Mg0.2Te quantum well containing resident holes. The experiment is performed at a temperature of 1.6 K using resonant excitation of the trion with circularly polarized light. The trion is formed from a resident hole, which is in a hole magnetic polaron state, and a photogenerated electron-hole pair. The dynamical evolution from the hole magnetic polaron to the trion magnetic polaron is accompanied by a spin flip of the electron, which results in negative circular polarization of the photoluminescence. The degree of circular polarization reaches -8% at zero magnetic field and strongly decreases in transverse magnetic fields exceeding 0.2 T. Our model considerations show that different localization sizes of the resident and photogenerated holes and the resulting difference in their exchange interaction with the Mn2+ spins maintains Mn spin polarization. The resulting exchange field of Mn acting on the electron provides a robust spin polarization of the trion magnetic polaron. We evaluate the electron exchange energy in the T+MP to be 0.19 meV, and the T+MP binding energy to be about 0.5-1 meV.
UR - http://www.scopus.com/inward/record.url?scp=85142820676&partnerID=8YFLogxK
UR - http://arxiv.org/abs/2208.05943
UR - https://www.mendeley.com/catalogue/8d79ebf2-829d-33de-8873-04339c3a9c74/
U2 - 10.1103/PhysRevB.106.195305
DO - 10.1103/PhysRevB.106.195305
M3 - Article
VL - 106
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 19
M1 - 195305
ER -
ID: 100298824