Identifying possible pairing states in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>
 by tunneling spectroscopy

Suzuki, Shu-Ichiro; Sato, Masatoshi; Tanaka, Yukio

doi:10.1103/physrevb.101.054505

Cited by 13 publications

(5 citation statements)

References 78 publications

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“…An exponential decrease in the overlap of the MM wave functions with an increase in the wire length is shown in the inset in Fig. 25. We can see that Γ M BS decreases by two orders of magnitude if the number of sites in the wire increases from N = 30 to N = 100.…”

Section: T-shaped Geometrymentioning

confidence: 82%

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Topological superconductivity and Majorana states in low-dimensional systems

Val'kov,

Shustin,

Aksenov

et al. 2022

Preprint

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We discuss the properties of topologically nontrivial superconducting phases and the conditions for their realization in condensed matter, the criteria for the appearance of elementary Majorana-type excitations in solids, and the corresponding principles and experimental methods for identifying Majorana bound states (MBSs).Along with the well-known Kitaev chain and superconducting nanowire (SW) models with spin-orbit coupling in an external magnetic field, we discuss models of quasi-two-dimensional materials in which MBSs are realized in the presence of noncollinear spin ordering. For finite-length SWs, we demonstrate a cascade of quantum transitions occurring with a change in the magnetic field, accompanied by a change in the fermion parity of the ground state. The corresponding anomalous behavior resonances and the spatial structure of the lowest-energy SW state. The conditions for the occurrence of an MBS in the phase of the coexistence of chiral d + id superconductivity and 120-degree spin ordering are determined in the framework of the t − J − V model on a triangular lattice. We take electron-electron interactions into account in discussing the topological invariants of low-dimensional superconducting materials with noncollinear spin ordering. The formation of Majorana modes in regions with an odd value of a topological Z invariant is demonstrated. The spatial structure of these excitations in the Hubbard fermion ensemble is determined.

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Section: T-shaped Geometrymentioning

confidence: 82%

“…2. Superconductors with the p or chiral p x + ip y symmetry type, which include Sr 2 RuO 4 [22,23] (a discussion of the type of symmetry in this compound is ongoing [24,25]) and uranium superconductors UGe 2 , UCoGe, URhGe [26,27].…”

mentioning

confidence: 99%

Topological superconductivity and Majorana states in low-dimensional systems

Val'kov,

Shustin,

Aksenov

et al. 2022

Preprint

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“…We first discuss the differential conductance of the d zx + id yz -wave state [40][41][42] described by the pair potential in Eq. ( 14).…”

Section: Differential Conductancementioning

confidence: 99%

“…Nevertheless, our model for the (d zx +id yz ) ′ -wave state is derived from rough assumptions regarding the long-range pairing terms. In addition, the transport measurements along the c-axis [22,26] result in gapped conductance spectra, suggesting the abof the Andreev bound states at the top surface of SRO (i.e., the surface parallel to the ab-plane), which appears to be inconsistent with the (d zx + id yz ) ′ -wave state (as well as the d zx + id yz -wave state) [40][41][42]. Therefore, a more conclusive result could be attained by examining the conductance spectra using additional microscopic models [9], which is left as a future task.…”

Section: Relevance To Experimentsmentioning

confidence: 99%

Fingerprints of possible even-parity superconducting states in Sr$_2$RuO$_4$ detected by planar tunneling spectroscopy

Ikegaya¹,

Suzuki²,

Tanaka³

et al. 2021

Preprint

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After more than 25 years of research, three even-parity superconducting states-the d + id-wave, d + ig-wave, and s + id-wave states-have emerged as leading candidates for the superconducting states of Sr2RuO4. In the present work, we propose a tunneling spectroscopy experiment for distinguishing among these three superconducting states. The key component of our proposal is that we examine the conductance spectra of normal-metal/Sr2RuO4 junctions with various angles between the junction interface and the crystal axis of the Sr2RuO4. The angle dependence of the conductance spectra shows a unique pattern in each superconducting state, which can function as a fingerprint for verifying the pairing symmetry of Sr2RuO4.

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“…For example, superconducting pairing of electrons with the same spin projections (triplet pairing) was found to play an important role in the realization of TP with MMs. Since there are quite a few candidates for triplet superconductors (Sr 2 RuO 4 , UGe 2 , UCoGe, URhGe [21][22][23][24][25][26]), it turns out to be important to search for the conditions for MMs in other compounds and structures. To date, the most studied TSCs are:…”

Section: Introductionmentioning

confidence: 99%

Aspects of topological superconductivity in 2D systems: noncollinear magnetism, skyrmions, and higher-order topology

Zlotnikov,

Shustin,

Fedoseev

2021

Preprint

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The review is aimed at highlighting the aspects of topological superconductivity in the absence of spin-orbit interaction in two-dimensional systems with long-range non-collinear spin ordering or magnetic skyrmions. Another purpose is to give a brief introduction to the new concept of topological superconductivity, i.e. higher-order topology in two-dimensional systems including spin-orbit coupled structures. The formation of Majorana modes due to magnetic textures is discussed. The role of effective triplet pairings and odd fermion parity of the ground state wave function in different systems is emphasized. We describe the peculiarities of the magnetic skyrmions, leading to the formation of the Majorana modes and defects on which the modes are localized. The problem of braiding in the two-dimensional systems, especially in higher-order topological superconductors, is considered.

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Identifying possible pairing states in Sr2RuO4 by tunneling spectroscopy

Cited by 13 publications

References 78 publications

Topological superconductivity and Majorana states in low-dimensional systems

Topological superconductivity and Majorana states in low-dimensional systems

Fingerprints of possible even-parity superconducting states in Sr$_2$RuO$_4$ detected by planar tunneling spectroscopy

Aspects of topological superconductivity in 2D systems: noncollinear magnetism, skyrmions, and higher-order topology

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