Experimental studies on nuclear field generated orthogonal to electron spin in single self-assembled nanostructures

Kaji, R.; Yamamoto, Sota; Matsusaki, Ryosuke; Adachi, S.

doi:10.7567/1347-4065/aafe66

Cited by 1 publication

(4 citation statements)

References 32 publications

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“…These studies suggest strongly that the nuclear quadrupole interaction (NQI), which is caused from the coupling of nuclear spin and electric‐field gradient induced by the residual strain in SA‐QDs, contributes to the formation of a large in‐plane nuclear field. To date, we have proposed a formation model of the large in‐plane nuclear field by considering the effects of NQI and successfully obtained a qualitative agreement with the observed anomalous Hanle curves . In the model, two effects, the stabilization of NSP along the principal axis of NQI and strongly anisotropic response of nuclear states due to the eigenstate mixing, are included as the effects of NQI.…”

Section: Introductionmentioning

confidence: 73%

“…The observed value of

| B_{normalc} |

increased with the excitation power density and saturated eventually . This indicates that

| B_{normalc} |

is limited by the time when unpaired electron occupies a QD, and the saturation of

| B_{normalc} |

is synchronized with the saturation of the PL intensity.…”

Section: Azimuth Angle Dependence Of the Anomalous Hanle Curvementioning

confidence: 85%

“…Obviously, the observed curve is distorted drastically from a normal one. The anomalous broadening indicates the presence of the in‐plane nuclear field

B_{n, x}

which develops with compensating for B x until the critical field B c where the abrupt change in ρ c occurs . The value of B c depends on the sweep direction of B x ;

| B_{normalc} |

with increasing

| B_{x} |

was larger than that with decreasing

| B_{x} |

.…”

Section: Azimuth Angle Dependence Of the Anomalous Hanle Curvementioning

confidence: 97%

“…Recently, a large nuclear field orthogonal to the photo‐injected electron spin has been reported in the self‐assembled (SA) InAs and InAlAs QDs, which is beyond the scope of a traditional model where a large nuclear field parallel to the injected electron spin was mainly discussed. Such a large in‐plane nuclear field induces a drastic distortion of the electron spin depolarization curve under the transverse magnetic field (i.e., Hanle curve), whereas W‐shaped Hanle curve in a strain‐free

{GaAs/Al}_{0.3} {Ga}_{0.7}

As QD was reproduced reasonably with the traditional model .…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies on the role of nuclear quadrupole interaction (NQI) to the in-plane nuclear field formation are performed in single self-assembled In 0.75 Al 0.25 As= Al 0.3 Ga 0.7 As 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 %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 nuclearfield 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.

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Section: Introductionmentioning

confidence: 73%

“…The observed value of

| B_{normalc} |

increased with the excitation power density and saturated eventually . This indicates that

| B_{normalc} |

is limited by the time when unpaired electron occupies a QD, and the saturation of

| B_{normalc} |

is synchronized with the saturation of the PL intensity.…”

Section: Azimuth Angle Dependence Of the Anomalous Hanle Curvementioning

confidence: 85%

“…Obviously, the observed curve is distorted drastically from a normal one. The anomalous broadening indicates the presence of the in‐plane nuclear field

B_{n, x}

which develops with compensating for B x until the critical field B c where the abrupt change in ρ c occurs . The value of B c depends on the sweep direction of B x ;