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Influence of a Longitudinal Field on the Large In-Plane Nuclear Field Formation in Single Quantum Dots

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Title: Influence of a Longitudinal Field on the Large In-Plane Nuclear Field Formation in Single Quantum Dots
Authors: Yamamoto, Sota Browse this author
Arakawa, Takuya Browse this author
Matsusaki, Ryosuke Browse this author
Kaji, Reina Browse this author
Adachi, Satoru Browse this author →KAKEN DB
Keywords: hyperfine interaction
nuclear quadrupole interaction
quantum dots
Issue Date: Feb-2020
Publisher: Wiley-Blackwell
Journal Title: Physica status solidi B-basic solid state physics
Volume: 257
Issue: 2
Start Page: 1900381
Publisher DOI: 10.1002/pssb.201900381
Abstract: Experimental studies on the role of nuclear quadrupole interaction (NQI) to the in-plane nuclear field formation are performed in single self-assembled In0.75Al0.25As/Al0.3Ga0.7As quantum dots (QDs). In Hanle-effect measurements, the electron depolarization curves deviating far from a standard Lorentzian shape are observed: the curves with anomalously large width and hysteretic behavior at the critical transverse magnetic field. These anomalies indicate the growth of an in-plane nuclear field compensating the applied transverse magnetic field up to approximate to 1 T and appear regardless of the excitation helicity. The azimuth angle dependence of the critical field of the hysteretic response reveals that the principal axis of the NQI is almost parallel to the crystal growth axis. This fact suggests that the main origin of the NQI which is related with in-plane nuclear-field formation is not random alloying among In and Al nuclei but residual strain of QDs. Furthermore, a longitudinal magnetic field by a neodymium magnet breaks the excitation-helicity independence of the Hanle curves and the shape of curves becomes very different depending on the helicity. The obtained results are explained well with a simple consideration and indicate that the NQI takes multirole in the formation of in-plane nuclear field.
Rights: This is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at https://doi.org/10.1002/pssb.201900381. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Type: article (author version)
URI: http://hdl.handle.net/2115/80347
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 足立 智

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