Ultralow-Noise Atomic-Scale Structures for Quantum Circuitry in Silicon
journal contributionposted on 15.08.2016, 00:00 by Saquib Shamim, Bent Weber, Daniel W. Thompson, Michelle Y. Simmons, Arindam Ghosh
The atomically precise doping of silicon with phosphorus (Si:P) using scanning tunneling microscopy (STM) promises ultimate miniaturization of field effect transistors. The one-dimensional (1D) Si:P nanowires are of particular interest, retaining exceptional conductivity down to the atomic scale, and are predicted as interconnects for a scalable silicon-based quantum computer. Here, we show that ultrathin Si:P nanowires form one of the most-stable electrical conductors, with the phenomenological Hooge parameter of low-frequency noise being as low as ≈10–8 at 4.2 K, nearly 3 orders of magnitude lower than even carbon-nanotube-based 1D conductors. A in-built isolation from the surface charge fluctuations due to encapsulation of the wires within the epitaxial Si matrix is the dominant cause for the observed suppression of noise. Apart from quantum information technology, our results confirm the promising prospects for precision-doped Si:P structures in atomic-scale circuitry for the 11 nm technology node and beyond.
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quantum information technologynanowire4.2 KUltralow-Noise Atomic-Scale Structuresatomic-scale circuitry11 nm technology nodeepitaxial Si matrix3 ordersscanning tunneling microscopyin-built isolationfield effect transistorsscalable silicon-based quantum computersurface charge fluctuationscarbon-nanotube-based 1 D conductorsQuantum CircuitrySTMHooge parameter