– Niels Bohr Institute - University of Copenhagen

Hole spin coherence in a Ge/Si heterostructure nanowire

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Andrew P Higginbotham, Thorvald Wadum Larsen, Jun Yao, Hao Yan, Charles M Lieber, Charles M Marcus, Ferdinand Kuemmeth

Relaxation and dephasing of hole spins are measured in a gate-defined Ge/Si nanowire double quantum dot using a fast pulsed-gate method and dispersive readout. An inhomogeneous dephasing time T2(*)≈ 0.18 μs exceeds corresponding measurements in III-V semiconductors by more than an order of magnitude, as expected for predominately nuclear-spin-free materials. Dephasing is observed to be exponential in time, indicating the presence of a broadband noise source, rather than Gaussian, previously seen in systems with nuclear-spin-dominated dephasing.
Original languageEnglish
Article number3582-3586
JournalNano Letters
Issue number3582
StatePublished - 5 May 2014

Bibliographical note

Preprint available at http://arxiv.org/abs/1403.2093.

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