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Solid-state Stern-Gerlach spin splitter for magnetic field sensing, spintronics,
and quantum computing
#MMPMID29977689
Björnson K
; Black-Schaffer AM
Beilstein J Nanotechnol
2018[]; 9
(?): 1558-1563
PMID29977689
show ga
We show conceptually that the edge of a two-dimensional topological insulator can
be used to construct a solid-state Stern-Gerlach spin splitter. By threading such
a Stern-Gerlach apparatus with a magnetic flux, Aharanov-Bohm-like interference
effects are introduced. Using ferromagnetic leads, the setup can be used to both
measure magnetic flux and as a spintronics switch. With normal metallic leads a
switchable spintronics NOT-gate can be implemented. Furthermore, we show that a
sequence of such devices can be used to construct a single-qubit SU(2)-gate, one
of the two gates required for a universal quantum computer. The field
sensitivity, or switching field, b, is related to the characteristic size of the
device, r, through b = h/(2?qr(2)), with q being the unit of electric charge.