Prediction of above 20 K superconductivity of blue phosphorus bilayer with metal intercalations

Zhang, Junjie; Dong, Shuai

doi:10.1088/2053-1583/3/3/035006

Cited by 47 publications

(41 citation statements)

References 35 publications

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“…In general, the intravalley couplings can have different coupling potentials and therefore differing amplitudes in each valley. The observation of intrinsic superconductivity in BP has attracted much attention [49][50][51][52][53][54] as well as controversies 55,56 . Here we assume that the superconductivity can be induced extrinsically in the BP by making use of the proximity effect.…”

Section: Resultsmentioning

confidence: 99%

Strain-engineered Majorana zero energy modes and φ0 Josephson state in black phosphorus

2018

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We develop a theory for strain control of Majorana zero energy modes and the Josephson effect in black phosphorus (BP) devices proximity coupled to a superconductor. Employing realistic values for the band parameters subject to strain, we show that the strain closes the intrinsic band gap of BP; however, the proximity effect from the superconductor reopens it and creates Dirac and Weyl nodes. Our results illustrate that Majorana zero energy flat bands connect the nodes within the band-inverted regime in which their associated density of states is localized at the edges of the device. In a ferromagnetically mediated Josephson configuration, the exchange field induces superharmonics in the supercurrent phase relation in addition to a ϕ 0 phase shift, corresponding to a spontaneous supercurrent, and strain offers an efficient tool to control these phenomena. We analyze the experimental implications of our findings and show that they can pave the way for creating a rich platform for studying two-dimensional Dirac and Weyl superconductivity.

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Section: Resultsmentioning

confidence: 99%

Strain-engineered Majorana zero energy modes and φ0 Josephson state in black phosphorus

2018

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“…In order to accurately calculate interlayer binding in blue phosphorus, we need an accurate representation of the monolayer to serve as a reference. For computational convenience, we fixed the P-P bond length to 2.23Å which is the average of two different bond lengths of black phosphorus [28] and is also within the range of the bond lengths reported in previous DFT studies on blue phosphorene [29][30][31]. Small variations of the P-P bond length were found to have little effect on our DMC results presented below.…”

Section: A Optimizing the Monolayermentioning

confidence: 96%

Phase stability and interlayer interaction of blue phosphorene

et al. 2018

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In this work, we study the interlayer interactions between sheets of blue phosphorus with quantum Monte Carlo (QMC) methods. We find that as previously observed in black phosphorus, interlayer binding of blue phosphorus cannot be described by van der Waals (vdW) interactions alone within the density-functional theory framework. Specifically, while some vdW density functionals produced reasonable binding curves, none of them could provide a correct, even qualitatively, description of charge redistribution due to interlayer binding. We also show that small systematic errors in common practice QMC calculations, such as the choice of optimized geometry and finitesize corrections, are non-negligible given the energy and length scales of this problem. We mitigate some of the major sources of error and report QMC-optimized lattice constant, stacking, and interlayer binding energy for blue phosphorus. It is strongly suggested that these considerations are important and quite general in the modeling of two-dimensional phosphorus allotropes.

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“…Also, it has been found that black phosphorus in both orthorhombic and rhombohedral structures can intrinsically develop superconductivity [21][22][23][24][25][26][27][28][29][30][31] . However, the dominant pairing type in BP has brought up discussions and is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Fraunhofer response and supercurrent spin switching in black phosphorus with strain and disorder

2018

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We develop theory models for both ballistic and disordered superconducting monolayer black phosphorus devices in the presence of magnetic exchange field and strain. The ballistic case is studied through a microscopic Bogoliubov-de Gennes formalism while for the disordered case we formulate a quasiclassical model. Utilizing the two models, we theoretically study the response of supercurrent to an externally applied magnetic field in two-dimensional black phosphorus Josephson junctions. Our results demonstrate that the response of the supercurrent to a perpendicular magnetic field in ballistic samples can deviate from the standard Fraunhofer interference pattern when the Fermi level and mechanical strain are varied. This finding suggests the combination of chemical potential and strain is an efficient external knob to control the current response in highly sensitive strain-effect transistors and superconducting quantum interference devices. We also study the supercurrent in a superconductor-ferromagnet-ferromagnet-superconductor junction where the magnetizations of the two adjacent magnetized regions are uniform with misaligned orientations. We show that the magnetization misalignment can control the excitation of harmonics higher than the first harmonic sin ϕ (in which ϕ is the phase difference between the superconductors) in supercurrent and constitutes a full spin switching current element. Finally, we discuss possible experimental implementations of our findings. We foresee our models and discussions could provide guidelines to experimentalists in designing devices and future investigations.

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Prediction of above 20 K superconductivity of blue phosphorus bilayer with metal intercalations

Cited by 47 publications

References 35 publications

Strain-engineered Majorana zero energy modes and φ0 Josephson state in black phosphorus

Strain-engineered Majorana zero energy modes and φ0 Josephson state in black phosphorus

Phase stability and interlayer interaction of blue phosphorene

Fraunhofer response and supercurrent spin switching in black phosphorus with strain and disorder

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