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Condensed Matter
Special Issues
Multicomponent Superconductivity and Superfluidity
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Multicomponent Superconductivity and Superfluidity

A special issue of Condensed Matter (ISSN 2410-3896). This special issue belongs to the section "Superconductivity".

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 2200

Special Issue Editors

Prof. Dr. Andrea Perali

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Guest Editor
Scuola del Farmaco e Divisione di Fisica, Edificio di Fisica, Università di Camerino, Via Madonna delle Carceri 9, 62032 Camerino, Italy
Interests: high-Tc superconductivity (theory and phenomenology); multiband superconductivity; quantum size effects and shape resonances in superconductors; nanoscale superconductors; superconducting heterostructures; BCS-BEC crossover; pseudogap; superconducting fluctuations; ultracold fermions: superfluidity and BCS-BEC crossover; electron–hole superfluidity
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Roberta Citro

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Guest Editor
Department of Physics, University of Salerno, 84084 Fisciano, SA, Italy
Interests: Majorana physics; strongly correlated systems at low-dimensionality and quantum transport
Prof. Dr. David Neilson

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Guest Editor
Department of Physics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
Interests: superfluidity; electron–hole; exciton; BEC; BEC-BCS crossover; unequal masses; mass imbalance
Prof. Dr. Milorad Milosevic

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Guest Editor
Department of Physics, Faculty of Science, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium
Interests: physics of materials (superconductivity, magnetism, 2D materials, interfaces, hybrids (including soft–hard matter ones)); (nano)electronics; scientific computing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is dedicated to the proceedings of the conference Multicomponent Superconductivity and Superfluidity 2023, which will be held in San Benedetto del Tronto (Italy) and online on 8–10 September 2023 (http://www.multisuper.org/multisuper-2023). This international conference will provide an excellent forum for the presentation and discussion of recent developments in diverse fields of superconductivity and superfluidity. You are invited to submit a full manuscript for consideration and possible publication in this Special Issue. Submissions will be rapidly reviewed and published immediately if accepted. Invited and leading contributed papers will focus on the following topics:

  • Fluctuations and BCS-BEC crossover phenomena in low dimensional systems.
  • Hybrid systems, superconductivity at the interfaces, and coexistence of phases.
  • Highly nonlinear phenomena: Josephson and Andreev effects, topological defects, skyrmions and solitons, and vortex states.
  • Novel phenomena in multicomponent/multigap superconductors and superfluids.
  • Innovative numerical methods.

Prof. Dr. Andrea Perali
Prof. Dr. Roberta Citro
Prof. Dr. David Neilson
Prof. Dr. Milorad Milosevic
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Condensed Matter is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (2 papers)

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Research

10 pages, 2123 KiB  
Article
Topological Phase Diagram of an Interacting Kitaev Chain: Mean Field versus DMRG Study
by Giovanni Nunziante, Alfonso Maiellaro, Claudio Guarcello and Roberta Citro
Condens. Matter 2024, 9(1), 20; https://doi.org/10.3390/condmat9010020 - 20 Mar 2024
Viewed by 804
Abstract
In this work, we study the topological phase transitions of a Kitaev chain generalized by the addition of nearest-neighbor Coulomb interaction. We show the presence of a robust topological phase as a function of the interaction strength and of the on-site energy with [...] Read more.
In this work, we study the topological phase transitions of a Kitaev chain generalized by the addition of nearest-neighbor Coulomb interaction. We show the presence of a robust topological phase as a function of the interaction strength and of the on-site energy with associated non-zero energy Majorana states localized at the chain edges. We provide an effective mean-field model that allows for the self-consistent computation of the mean value of the local particle number operator, and we also perform Density Matrix Renormalization Group numerical simulations based on a tensor network approach. We find that the two methods show a good agreement in reporting the phase transition between trivial and topological superconductivity. Temperature robustness within a physically relevant threshold has also been demonstrated. These findings shed light on an entire class of topological interacting one-dimensional systems in which the effects of residual Coulomb interactions play a relevant role. Full article
(This article belongs to the Special Issue Multicomponent Superconductivity and Superfluidity)
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16 pages, 4940 KiB  
Article
Hybrid Superconducting/Superconducting Mesoscopic Heterostructure Studied by Modified Ginzburg–Landau Equations
by Jesús González, Angélica Melendez and Luis Camargo
Condens. Matter 2023, 8(4), 104; https://doi.org/10.3390/condmat8040104 - 01 Dec 2023
Viewed by 1083
Abstract
Studies involving vortexes in hybrid superconducting devices and their interactions with different components inside samples are important for reaching higher values of critical parameters in superconducting materials. The vortex distribution on each side of a sample with different fundamental parameters, such as temperature [...] Read more.
Studies involving vortexes in hybrid superconducting devices and their interactions with different components inside samples are important for reaching higher values of critical parameters in superconducting materials. The vortex distribution on each side of a sample with different fundamental parameters, such as temperature T, penetration depth λ, coherence length ξ, electron mass m, and the order parameter Ψ, may help to improve the superconducting properties. Thus, in this work, we used the modified Ginzburg–Landau theory to investigate a hybrid superconductor (HS), as well as to provide a highly tunable and adjustable theoretical tool for theoretically explaining the experimental results involving the HS in order to study the vortex behavior in superconductors of mesoscopic dimensions with extreme differences among their fundamental parameters. Therefore, we evaluated the influence of the HS on the vortex configuration and its effects on field-dependent magnetization. The results show that when the applied magnetic field H was increased, the diamagnetic response of the HS (Meissner effect) included additional jumps in magnetization, while diamagnetism continued to increase in the sample. In addition, the differences among parameters created an interface between both components, and two different magnitudes of supercurrent and vortex sizes caused less degradation of the local superconductivity, which increased the upper critical field. On the other hand, this type of HS with differences in parameters on both sides can be used to control the vortex movement in the selected sample of the superconducting region with more accuracy. Full article
(This article belongs to the Special Issue Multicomponent Superconductivity and Superfluidity)
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