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Analysis of the transient response of nuclear spins in GaAs with/without nuclear magnetic resonance

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Title: Analysis of the transient response of nuclear spins in GaAs with/without nuclear magnetic resonance
Authors: Rasly, Mahmoud Browse this author
Lin, Zhichao Browse this author
Yamamoto, Masafumi Browse this author →KAKEN DB
Uemura, Tetsuya Browse this author →KAKEN DB
Keywords: Nuclear spin
Nuclear magnetic resonance
Magnetic fields
Polarization
Magnetic field sensors
Issue Date: May-2016
Publisher: American Institute of Physics (AIP)
Journal Title: AIP Advances
Volume: 6
Issue: 5
Start Page: 056305
Publisher DOI: 10.1063/1.4943610
Abstract: As an alternative to studying the steady-state responses of nuclear spins in solid state systems, working within a transient-state framework can reveal interesting phenomena. The response of nuclear spins in GaAs to a changing magnetic field was analyzed based on the time evolution of nuclear spin temperature. Simulation results well reproduced our experimental results for the transient oblique Hanle signals observed in an all-electrical spin injection device. The analysis showed that the so called dynamic nuclear polarization can be treated as a cooling tool for the nuclear spins: It works as a provider to exchange spin angular momentum between polarized electron spins and nuclear spins through the hyperfine interaction, leading to an increase in the nuclear polarization. In addition, a time-delay of the nuclear spin temperature with a fast sweep of the external magnetic field produces a possible transient state for the nuclear spin polarization. On the other hand, the nuclear magnetic resonance acts as a heating tool for a nuclear spin system. This causes the nuclear spin temperature to jump to infinity: i.e., the average nuclear spins along with the nuclear field vanish at resonant fields of As-75, Ga-69 and Ga-71, showing an interesting step-dip structure in the oblique Hanle signals. These analyses provide a quantitative understanding of nuclear spin dynamics in semiconductors for application in future computation processing.
Rights: https://creativecommons.org/licenses/by/3.0/
Type: article
URI: http://hdl.handle.net/2115/62622
Appears in Collections:情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 植村 哲也

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