Spin coherence of electrons and holes in ZnSe‐based quantum wells studied by pump–probe Kerr rotation

Zhukov, E. A.; Yakovlev, D. R.; Schwan, A.; Yugov, O. A.; Waag, A.; Molenkamp, L. W.; Bayer, М.

doi:10.1002/pssb.201350233

Cited by 19 publications

(13 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hole g factor, on the other hand, is controlled by the complex spin level structure of the valence band and can vary strongly and nonmonotonically with changing quantum confinement. The out-of-plane and in-plane anisotropy of the hole g factor can be quite large both for QWs and QDs [15,[21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Large anisotropy of electron and holegfactors in infrared-emitting InAs/InAlGaAs self-assembled quantum dots

et al. 2016

Self Cite

View full text Add to dashboard Cite

A detailed study of the g-factor anisotropy of electrons and holes in InAs/In0.53Al0.24Ga0.23As selfassembled quantum dots emitting in the telecom spectral range of 1.5−1.6 µm (around 0.8 eV photon energy) is performed by time-resolved pump-probe ellipticity technique using a superconducting vector magnet. All components of the g-factor tensors are measured, including their spread in the quantum dot (QD) ensemble. Surprisingly, the electron g factor shows a large anisotropy changing from ge,x = −1.63 to ge,z = −2.52 between directions perpendicular and parallel to the dot growth axis, respectively, at an energy of 0.82 eV. The hole g-factor anisotropy at this energy is even stronger: |g h,x | = 0.64 and |g h,z | = 2.29. On the other hand, the in-plane anisotropies of electron and hole g factors are small. The pronounced out-of-plane anisotropy is also observed for the spread of the g factors, determined from the spin dephasing time. The hole longitudinal g factors are described with a theoretical model that allows us to estimate the QD parameters. We find that the QD height-to-diameter ratio increases while the indium composition decreases with increasing QD emission energy.

show abstract

Section: Introductionmentioning

confidence: 99%

Large anisotropy of electron and holegfactors in infrared-emitting InAs/InAlGaAs self-assembled quantum dots

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…This situation is typical for n-doped quantum wells and quantum dots. Electron spin dephasing times in these structures can be as long as 30 − 100 ns, which has been documented for quantum wells based on GaAs, CdTe and ZnSe semiconductors [32][33][34][35]. It exceeds the typical repetition period of the mode-locked pulsed lasers of 13 ns and an accumulation of the electron spin coherence can be realized here.…”

Section: Introductionmentioning

confidence: 67%

“…Examples for the pump-probe Kerr rotation signals in the ZnSe:F epilayers and ZnSe-based QWs can be found in Refs. 33,42. The RSA signals for these samples, measured for various modulation frequencies are shown in Fig.…”

Section: B Znse:f Epilayer and Znse-based Qwmentioning

confidence: 99%

All-optical NMR in semiconductors provided by resonant cooling of nuclear spins interacting with electrons in the resonant spin amplification regime

et al. 2014

Self Cite

View full text Add to dashboard Cite

file = NMR˙RSA˙24feb14˙final.tex, printing time = 12 : 01) Resonant cooling of different nuclear isotopes manifested in optically-induced nuclear magnetic resonances (NMR) is observed in n-doped CdTe/(Cd,Mg)Te and ZnSe/(Zn,Mg)Se quantum wells and for donor-bound electrons in ZnSe:F and GaAs epilayers. By time-resolved Kerr rotation used in the regime of resonant spin amplification we can expand the range of magnetic fields where the effect can be observed up to nuclear Larmor frequencies of 170 kHz. The mechanism of the resonant cooling of the nuclear spin system is analyzed theoretically. The developed approach allows us to model the resonant spin amplification signals with NMR resonances.

show abstract

“…The mechanism has some similarity with the mechanism for spin coherence generation in electron-and hole-gases of low density in nonmagnetic QWs and in singly-charged quantum dots under resonant trion excitation. It has been validated for GaAs-, (In,Ga)As-, CdTe-and ZnSe-based QWs and (In,Ga)Asbased quantum dots, for which charged exciton (trion) states are of key importance for the optical properties [18,20,30,31].…”

Section: Discussionmentioning

confidence: 99%

Optical orientation of hole magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wells

et al. 2016

Self Cite

View full text Add to dashboard Cite

The optically induced spin polarization in (Cd,Mn)Te/(Cd,Mn,Mg)Te diluted-magneticsemiconductor quantum wells is investigated by means of picosecond pump-probe Kerr rotation. At 1.8 K temperature, additionally to the oscillatory signals from photoexcited electrons and Manganese spins precessing about an external magnetic field, a surprisingly long-lived (up to 60 ns) nonoscillating spin polarization is detected. This polarization is related to optical orientation of equilibrium magnetic polarons involving resident holes. The suggested mechanism for the optical orientation of the equilibrium magnetic polarons indicates that the detected polaron dynamics originates from unexcited magnetic polarons. The polaron spin dynamics is controlled by the anisotropic spin structure of the heavy-hole resulting in a freezing of the polaron magnetic moment in one of the two stable states oriented along the structure growth axis. Spin relaxation between these states is prohibited by a potential barrier, which depends on temperature and magnetic field. The magnetic polaron relaxation is accelerated with increasing temperature and in magnetic field.

show abstract

Spin coherence of electrons and holes in ZnSe‐based quantum wells studied by pump–probe Kerr rotation

Cited by 19 publications

References 35 publications

Large anisotropy of electron and holegfactors in infrared-emitting InAs/InAlGaAs self-assembled quantum dots

Large anisotropy of electron and holegfactors in infrared-emitting InAs/InAlGaAs self-assembled quantum dots

All-optical NMR in semiconductors provided by resonant cooling of nuclear spins interacting with electrons in the resonant spin amplification regime

Optical orientation of hole magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wells

Contact Info

Product

Resources

About