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Topological superconductivity in Janus monolayer transition metal dichalcogenides
The Janus monolayer transition metal dichalcogenides (TMDs) MXY ( M = Mo, W, etc . and X , Y = S, Se, etc .) have been successfully synthesized in recent years. The Rashba spin splitting in these compounds arises due to the breaking of out-of-plane mirror symmetry. Here we study the pairing symmetry...
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Published in: | Chinese physics B 2022-11, Vol.31 (11), p.110304-250 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The Janus monolayer transition metal dichalcogenides (TMDs)
MXY
(
M
= Mo, W,
etc
. and
X
,
Y
= S, Se,
etc
.) have been successfully synthesized in recent years. The Rashba spin splitting in these compounds arises due to the breaking of out-of-plane mirror symmetry. Here we study the pairing symmetry of superconducting Janus monolayer TMDs within the weak-coupling framework near critical temperature
T
c
, of which the Fermi surface (FS) sheets centered around both
Γ
and
K
(
K
′) points. We find that the strong Rashba splitting produces two kinds of topological superconducting states which differ from that in its parent compounds. More specifically, at relatively high chemical potentials, we obtain a time-reversal invariant
s
+
f
+
p
-wave mixed superconducting state, which is fully gapped and topologically nontrivial,
i.e.
, a ℤ
2
topological state. On the other hand, a time-reversal symmetry breaking
d
+
p
+
f
-wave superconducting state appears at lower chemical potentials. This state possess a large Chern number |
C
| = 6 at appropriate pairing strength, demonstrating its nontrivial band topology. Our results suggest the Janus monolayer TMDs to be a promising candidate for the intrinsic helical and chiral topological superconductors. |
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ISSN: | 1674-1056 2058-3834 |
DOI: | 10.1088/1674-1056/ac8739 |