We propose a theoretical framework for generating gapless topological superconductivity (GTSC) hosting Majorana flat edge modes (MFEMs) in the presence of a two-dimensional (2D) array of magnetic adatoms with noncollinear spin texture deposited on top of an unconventional superconductor. Our observations reveal two distinct topological phase transitions within the emergent Shiba band depending on the exchange coupling strength (J) between magnetic adatom spins and superconducting electrons: the first one designates transition from gapless non-topological to gapless topological phase at lower J, while the second one denotes transition from gapless topological to a trivial gapped superconducting phase at higher J. The gapless topological superconducting phase survives at intermediate values of J, hosting MFEMs. Furthermore, we investigate the nature of the bulk effective pairings, which indicate that GTSC appears due to the interplay between pseudo “s-wave” and pseudo “ ” types of pairing. Consequently, our study opens a promising avenue for the experimental realization of GTSC in 2D Shiba lattice based on d-wave superconductors as a high-temperature platform.
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29 April 2024
Research Article|
May 02 2024
Multiple topological phase transitions unveiling gapless topological superconductivity in magnet/unconventional superconductor hybrid platform
Special Collection:
Topological and Chiral Matter – Physics and Applications
Minakshi Subhadarshini
;
Minakshi Subhadarshini
(Formal analysis, Investigation, Methodology, Writing – original draft)
1
Institute of Physics
, Sachivalaya Marg, Bhubaneswar 751005, India
2
Homi Bhabha National Institute, Training School Complex
, Anushakti Nagar, Mumbai 400094, India
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Amartya Pal
;
Amartya Pal
(Formal analysis, Investigation, Methodology, Writing – original draft)
1
Institute of Physics
, Sachivalaya Marg, Bhubaneswar 751005, India
2
Homi Bhabha National Institute, Training School Complex
, Anushakti Nagar, Mumbai 400094, India
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Pritam Chatterjee;
Pritam Chatterjee
(Conceptualization, Supervision, Writing – original draft)
1
Institute of Physics
, Sachivalaya Marg, Bhubaneswar 751005, India
2
Homi Bhabha National Institute, Training School Complex
, Anushakti Nagar, Mumbai 400094, India
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Arijit Saha
Arijit Saha
a)
(Conceptualization, Supervision, Writing – original draft)
1
Institute of Physics
, Sachivalaya Marg, Bhubaneswar 751005, India
2
Homi Bhabha National Institute, Training School Complex
, Anushakti Nagar, Mumbai 400094, India
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 124, 183102 (2024)
Article history
Received:
January 22 2024
Accepted:
April 20 2024
Citation
Minakshi Subhadarshini, Amartya Pal, Pritam Chatterjee, Arijit Saha; Multiple topological phase transitions unveiling gapless topological superconductivity in magnet/unconventional superconductor hybrid platform. Appl. Phys. Lett. 29 April 2024; 124 (18): 183102. https://doi.org/10.1063/5.0199275
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