Ultra-deep optical cooling of coupled nuclear spin-spin and quadrupole reservoirs in a GaAs/(Al,Ga)As quantum well

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dc.contributor.authorKotur, Mladen
dc.contributor.authorTolmachev, Daniel O.
dc.contributor.authorLitvyak, Valentina M.
dc.contributor.authorKavokin, Kirill V.
dc.contributor.authorSuter, Dieter
dc.contributor.authorYakovlev, Dmitri R.
dc.contributor.authorBayer, Manfred
dc.date.accessioned2021-12-13T09:53:18Z
dc.date.available2021-12-13T09:53:18Z
dc.date.issued2021-08-23
dc.description.abstractThe physics of interacting nuclear spins in solids is well interpreted within the nuclear spin temperature concept. A common approach to cooling the nuclear spin system is adiabatic demagnetization of the initial, optically created, nuclear spin polarization. Here, the selective cooling of 75As spins by optical pumping followed by adiabatic demagnetization in the rotating frame is realized in a nominally undoped GaAs/(Al,Ga)As quantum well. The lowest nuclear spin temperature achieved is 0.54 μK. The rotation of 6 kG strong Overhauser field at the 75As Larmor frequency of 5.5 MHz is evidenced by the dynamic Hanle effect. Despite the presence of the quadrupole induced nuclear spin splitting, it is shown that the rotating 75As magnetization is uniquely determined by the spin temperature of coupled spin-spin and quadrupole reservoirs. The dependence of heat capacity of these reservoirs on the external magnetic field direction with respect to crystal and structure axes is investigated.en
dc.identifier.urihttp://hdl.handle.net/2003/40602
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-22472
dc.language.isoende
dc.relation.ispartofseriesCommunications physics;Vol. 4. 2021, Article number: 193
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectSemiconductorsen
dc.subjectSpintronicsen
dc.subject.ddc530
dc.subject.rswkHalbleitertechnologiede
dc.subject.rswkSpintronikde
dc.subject.rswkKernmagnetismusde
dc.subject.rswkQuantenwellde
dc.titleUltra-deep optical cooling of coupled nuclear spin-spin and quadrupole reservoirs in a GaAs/(Al,Ga)As quantum wellen
dc.typeTextde
dc.type.publicationtypearticlede
dcterms.accessRightsopen access
eldorado.secondarypublicationtruede
eldorado.secondarypublication.primarycitationCommunications physics. Vol. 4. 2021, Article number: 193en
eldorado.secondarypublication.primaryidentifier10.1038/s42005-021-00681-6de

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