Engineering ultralong spin coherence in two-dimensional hole systems at low temperatures - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




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Abstract: For the realisation of scalable solid-state quantum-bit systems, spins insemiconductor quantum dots are promising candidates. A key requirement forquantum logic operations is a sufficiently long coherence time of the spinsystem. Recently, hole spins in III-V-based quantum dots were discussed asalternatives to electron spins, since the hole spin, in contrast to theelectron spin, is not affected by contact hyperfine interaction with thenuclear spins. Here, we report a breakthrough in the spin coherence times ofhole ensembles, confined in so called natural quantum dots, in narrowGaAs-AlGaAs quantum wells at temperatures below 500 mK. Consistently,time-resolved Faraday rotation and resonant spin amplification techniquesdeliver hole-spin coherence times, which approach in the low magnetic fieldlimit values above 70 ns. The optical initialisation of the hole spinpolarisation, as well as the interconnected electron and hole spin dynamics inour samples are well reproduced using a rate equation model.



Autor: T. Korn, M. Kugler, M. Griesbeck, R. Schulz, A. Wagner, M. Kubová, C. Gerl, D. Schuh, W. Wegscheider, C. Schüller

Fuente: https://arxiv.org/







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