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2016 ; 7
(ä): 11167
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Multi-terminal Josephson junctions as topological matter
#MMPMID27040917
Riwar RP
; Houzet M
; Meyer JS
; Nazarov YV
Nat Commun
2016[Apr]; 7
(ä): 11167
PMID27040917
show ga
Topological materials and their unusual transport properties are now at the focus
of modern experimental and theoretical research. Their topological properties
arise from the bandstructure determined by the atomic composition of a material
and as such are difficult to tune and naturally restricted to ?3 dimensions. Here
we demonstrate that n-terminal Josephson junctions with conventional
superconductors may provide novel realizations of topology in n-1 dimensions,
which have similarities, but also marked differences with existing 2D or 3D
topological materials. For n?4, the Andreev subgap spectrum of the junction can
accommodate Weyl singularities in the space of the n-1 independent
superconducting phases, which play the role of bandstructure quasimomenta. The
presence of these Weyl singularities enables topological transitions that are
manifested experimentally as changes of the quantized transconductance between
two voltage-biased leads, the quantization unit being 4e(2)/h, where e is the
electric charge and h is the Planck constant.