Pauli spin blockade in a highly tunable silicon double quantum dot.

Scientific Reports
N S LaiA S Dzurak

Abstract

Double quantum dots are convenient solid-state platforms to encode quantum information. Two-electron spin states can be detected and manipulated using quantum selection rules based on the Pauli exclusion principle, leading to Pauli spin blockade of electron transport for triplet states. Coherent spin states would be optimally preserved in an environment free of nuclear spins, which is achievable in silicon by isotopic purification. Here we report on a deliberately engineered, gate-defined silicon metal-oxide-semiconductor double quantum dot system. The electron occupancy of each dot and the inter-dot tunnel coupling are independently tunable by electrostatic gates. At weak inter-dot coupling we clearly observe Pauli spin blockade and measure a large intra-dot singlet-triplet splitting > 1 meV. The leakage current in spin blockade has a peculiar magnetic field dependence, unrelated to electron-nuclear effects and consistent with the effect of spin-flip cotunneling processes. The results obtained here provide excellent prospects for realising singlet-triplet qubits.

References

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Citations

Oct 6, 2015·Nano Letters·Ruoyu LiAlexander R Hamilton
May 16, 2014·Nature Communications·Xiaojie HaoHongWen Jiang
Aug 16, 2012·Nature Communications·Xin WangS Das Sarma
May 1, 2012·Physical Review Letters·Dimitrie CulcerS Das Sarma
Sep 13, 2014·Nanotechnology·Neil M ZimmermanAndrew S Dzurak
Apr 1, 2016·Journal of Applied Physics·Justin K PerronNeil M Zimmerman
Apr 11, 2018·Scientific Reports·Matthias BraunsFloris A Zwanenburg
Aug 26, 2015·Nanotechnology·M G BorselliA T Hunter
May 21, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Justin K PerronNeil M Zimmerman
Nov 8, 2014·Physical Review Letters·Niklas RohlingGuido Burkard
Mar 10, 2012·Physical Review Letters·J R PranceM A Eriksson
Nov 10, 2013·Nano Letters·Khoi T NguyenMalcolm S Carroll

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Methods Mentioned

BETA
electron beam lithography

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