Superconducting piezoelectric effect

Chazono, Michiya; Watanabe, Hikaru; Yanase, Youichi

doi:10.1103/physrevb.105.024509

Cited by 14 publications

(13 citation statements)

References 48 publications

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“…In addition, a part of the authors proposed a unique vortex structure on anapole domains, current-induced anapole domain switching 28 , and nonreciprocal optical and Meissner responses 72,73 . Recently, we also showed the superconducting piezoelectric effect 42 and intrinsic superconducting diode effect 74 in the anapole superconductors, which will be presented in another publication 43 .…”

Section: Summary and Discussionmentioning

confidence: 80%

“…In contrast to the FFLO and helical superconductivity, the anapole superconductivity can be studied with avoiding experimental difficulties due to vortices induced by an external magnetic field. For instance, the anapole domain switching 28 , superconducting piezoelectric effect 42,43 , and Josephson effect 44,45 may uncover intrinsic properties of anapole superconductivity. Therefore, the anapole superconductivity may be the key to elucidating the PT -symmetric parity-mixed pairing state, and it may realize and clarify the finite-q pairing state which has been searched for a long time 1,2,46 .…”

Section: Introductionmentioning

confidence: 99%

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Quantum-geometry-induced anapole superconductivity

Kitamura¹,

Kanasugi²,

Chazono³

et al. 2022

Preprint

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Anapole superconductivity recently proposed for multiband superconductors [Commun. Phys. 5, 39 (2022)] is a key feature of time-reversal (T )-symmetry-broken polar superconductors. The anapole moment was shown to arise from the asymmetric Bogoliubov spectrum, which induces a finite center of mass momenta of Cooper pairs at the zero magnetic field. In this paper, we show an alternative mechanism of anapole superconductivity: the quantum geometry induces the anapole moment when the interband pairing and Berry connection are finite. Thus, the anapole superconductivity is a ubiquitous feature of T -broken multiband polar superconductors. Applying the theory to a minimal model of UTe2, we demonstrate the quantum-geometry-induced anapole superconductivity. Furthermore, we show the Bogoliubov Fermi surfaces (BFS) in an anapole superconducting state and predict an unusual temperature dependence of BFS due to the quantum geometry. Experimental verification of these phenomena may clarify the superconducting state in UTe2 and reveal the ubiquitous importance of quantum geometry in exotic superconductors.

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Section: Summary and Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Quantum-geometry-induced anapole superconductivity

Kitamura¹,

Kanasugi²,

Chazono³

et al. 2022

Preprint

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“…A similar treatment is used in Refs. [56,[71][72][73]. Under the above assumption, the mean-field Hamiltonian is given by…”

Section: Modelmentioning

confidence: 99%

Supercurrent-Induced Weyl Superconductivity

Sumita,

Takasan

2022

Preprint

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We show that Weyl superconductivity can be induced by finite supercurrent in noncentrosymmetric spin-orbitcoupled superconductors with line nodes. We introduce a three-dimensional tight-binding model of a tetragonal superconductor in a 𝐷 + 𝑝-wave pairing state with a finite center-of-mass momentum, and elucidate that a line-nodal to point-nodal spectral transition occurs by applying an infinitesimal supercurrent. We also clarify that the higher-order effect in spin-orbit coupling is particularly important for this phenomenon. The point nodes are protected by topologically nontrivial Weyl charges, and therefore gapless arc states appear on the surface of the superconductor. Furthermore, both the positions and the Weyl charges of the point nodes depend on the direction of the current. In addition, a quantized Berry phase defined on high-symmetry planes characterizes the Weyl nodes when the in-plane supercurrent is considered. Our proposition paves a new way for controlling the superconducting gap structures by using an external field.

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“…In this case, the electrostriction effect is a typical example. [10][11][12][13] Currently, the research in this field has been mainly focused on type-I coupling, [14][15][16][17][18][19] while type-II coupling is rather scarce, although it is promising for novel device applications. 20 The emergence of two-dimensional (2D) materials provides an unprecedented opportunity for exploring electro-mechanical coupling by considering their rich structural and electronic properties.…”

Section: Introductionmentioning

confidence: 99%