Triplet p-wave superconductivity with ABM state in epitaxial Bi/Ni bilayers

Zhao, Gejian; Gong, Xinxin; He, James; Gifford, Jessica; Zhou, Hongyao; Chen, Y.; X, Jin; Chien, C. L.; Chen, T. Y.

doi:10.48550/arxiv.1810.10403

Cited by 4 publications

(16 citation statements)

References 5 publications

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“…[23], and our theoretical fitting curves to the experimental data can also be found in Ref. [23]. In this paper a more detailed version of our theoretical formalism is demonstrated.…”

Section: Conductance Formulamentioning

confidence: 72%

“…In FIG. 4 the black circles and the blue circles are the experimental data [23] and the red lines are theoretical fitting curves by our theory. The normalized conductance spectra do not depend on spin polarization.…”

Section: Conductance Spectra For the Abm Statementioning

confidence: 96%

“…Note that we have presented the part of our theoretical formalism in the supplementary materials of Ref. [23], and our theoretical fitting curves to the experimental data can also be found in Ref. [23].…”

Section: Conductance Formulamentioning

confidence: 99%

“…4. Furthermore, we utilized the theoretical curves of the ABM state to fit the data from the PCAR experiment on the Bi/N i bilayer [23]. In FIG.…”

Section: Conductance Spectra For the Abm Statementioning

confidence: 99%

“…The single crystal Bi (110), observed bulk superconductivity below 0.53 mK [22], is epitaxially grown on the weak ferromagnetic N i (100) layer to yield a Bi/N i bilayer whose superconducting transition temperature is enhanced to 4 * jche14@fudan.edu.cn † yanchen99@fudan.edu.cn K [21]. Therefore, this bilayer system has attracted much research interest [21,[23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Evidence of triplet superconductivity in Bi/Ni bilayers: Theoretical analysis of point contact Andreev reflection spectroscopy results

He,

Chen

2021

Preprint

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A theoretical formalism of Andreev reflection is proposed to provide a theoretical support for distinguishing the singlet pairing and the triplet pairing by the point contact Andreev reflection (PCAR) experiments, in contrast to the previous models designed only for the singlet pairing case. We utilize our theoretical curves to fit the data of the PCAR experiment on the unconventional superconductivity in the Bi/N i bilayer [arXiv:1810.10403], and find the Anderson-Brinkman-Morel state satisfies the main characteristics of the experimental data. Moreover, the Andreev reflection spectra of the Balian-Werthamer state and the chiral p-wave are also presented.

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“…[23], and our theoretical fitting curves to the experimental data can also be found in Ref. [23]. In this paper a more detailed version of our theoretical formalism is demonstrated.…”

Section: Conductance Formulamentioning

confidence: 72%

Section: Conductance Spectra For the Abm Statementioning

confidence: 96%

Section: Conductance Formulamentioning

confidence: 99%

“…4. Furthermore, we utilized the theoretical curves of the ABM state to fit the data from the PCAR experiment on the Bi/N i bilayer [23]. In FIG.…”

Section: Conductance Spectra For the Abm Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evidence of triplet superconductivity in Bi/Ni bilayers: Theoretical analysis of point contact Andreev reflection spectroscopy results

He,

Chen

2021

Preprint

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Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device

Niimi

Tokuda

Nakao

et al. 2023

Preprint

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Topological superconductors are one of the intriguing material groups from the viewpoint of not only condensed matter physics but also elementally particle physics and industrial application such as quantum computers because of the existence of Majorana fermion that is its own antiparticle. For the realization of devices using Majorana fermion, developments of the thin film devices and novel functionalities are highly desirable. Bi/Ni bilayer is a possible candidate for thin-film chiral superconductors where the time-reversal symmetry is broken. Here we report the phase shift of Little-Parks oscillations by half flux quantum φ0/2 in a Bi/Ni ring-shaped device induced by a small magnetic field through the ring. The half quantum fluxoid can be a decisive evidence for unconventional superconductors where the superconducting order parameter has an internal degree of freedom. The present result demonstrates that Bi/Ni is a chiral superconductor with a spin triplet component, and that the internal degree of freedom plays an important role in the phase of supercurrent. The present work also provides a new operating principle for quantum devices where the phase of the supercurrent can be shifted by π with a small magnetic field, based on the internal degree of freedom possessed by topological superconductivity.

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Andreev spectroscopy of the triplet superconductivity state in Bi/Ni bilayer system

Shang,

Liu,

Xia

2019

Preprint

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We calculate the Andreev spectroscopy between a ferromagnetic lead and Bi/Ni bilayer system for three types of superconducting states, including ABM state, ABM state mixing with S-wave state, ABM state mixing with pz-wave state. Among them, ABM state and ABM state mixing with Swave state can obtain the Andreev conductance consistent with the point contact experiment[G. J. Zhao,et al, arXiv:1810.10403], but failed to explain the experiment of time-domain THz spectroscopy experiment [Prashant Chauhan,et al, Phys. Rev. Lett. 122, 017002(2019)]. Only the ABM state mixing with pz-wave state can explain both experiments. Besides, we reveal the conductance peak near the zero energy is induced by the surface state of the ABM phase. Our work may provides helpful clarification for understanding of recent experiments.

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Triplet p-wave superconductivity with ABM state in epitaxial Bi/Ni bilayers

Cited by 4 publications

References 5 publications

Evidence of triplet superconductivity in Bi/Ni bilayers: Theoretical analysis of point contact Andreev reflection spectroscopy results

Evidence of triplet superconductivity in Bi/Ni bilayers: Theoretical analysis of point contact Andreev reflection spectroscopy results

Observation of the crossover from quantum fluxoid to half-quantum fluxoid in a chiral superconducting device

Andreev spectroscopy of the triplet superconductivity state in Bi/Ni bilayer system

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