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Condensed Matter
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Fluctuations and Highly Non-linear Phenomena in Superfluids and Superconductors VIII
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Fluctuations and Highly Non-linear Phenomena in Superfluids and Superconductors VIII

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

Deadline for manuscript submissions: closed (31 January 2025) | Viewed by 3919

Special Issue Editors

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
Special Issues, Collections and Topics in MDPI journals
Dr. Claudio Guarcello

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Guest Editor
Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, 84084 Fisciano, Italy
Interests: quantum transport of heat, charge, and spin in nanostructures; coherent caloritronics; noise and coherent dynamics in nanodevices; superconductivity and Josephson-based devices; soliton dynamics; out-of-equilibrium statistical mechanics; stochastic dynamics and noise-induced phenomena; Lévy flights and anomalous diffusion
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. Luca Dell'Anna

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Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università degli Studi di Padova, Via F. Marzolo 8, 35131 Padova, Italy
Interests: ultracold atoms; disordered systems; mesoscopic physics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Luca Salasnich

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Guest Editor
Department of Physics and Astronomy “Galileo Galilei”, University of Padova, Via Marzolo 8, 35131 Padova, Italy
Interests: Bose–Einstein condensation; ultracold atoms; quantum statistical physics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is dedicated to the proceedings of the conference SuperFluctuations 2024, which will be held in Salerno, Italy, from 16 to 18 September 2024 (http://www.multisuper.org/superfluctuations-2024). This international conference will provide an excellent forum for the presentation and discussion of recent developments in the diverse fields of superconductivity and superfluidity. You are invited to submit a full manuscript for consideration and possible publication in this Special Issue, focusing on the following topics:

  • Fluctuations and BCS-BEC crossover phenomena: multicomponent and low-dimensional systems.
  • Spin-orbitronics: theory and applications.
  • Novel quantum phenomena with Bosons and Fermions.
  • Highly non-linear phenomena: Josephson and Andreev effects, topological defects, vortex states.
  • Non-equilibrium superconductivity.
  • Electron-hole and excitonic superfluidity and supersolidity: theory, numerical simulations, and experimental realizations.
  • Innovative numerical methods: Machine Learning, its synergies with QMC, and applications.
  • Quantum technologies and quantum devices/sensors based on novel superconducting/superfluid systems.

The first 8 Invited Speakers accepting to submit the paper will be granted a full waiver on the APC - Article Processing Charge.

Prof. Dr. Roberta Citro
Dr. Claudio Guarcello
Prof. Dr. Andrea Perali
Prof. Dr. Luca Dell'Anna
Prof. Dr. Luca Salasnich
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.

Keywords

  • fluctuations
  • spin-orbitronics: theory
  • quantum phenomena
  • superfluidity
  • superconducting

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Related Special Issues

Published Papers (4 papers)

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Research

18 pages, 1106 KiB  
Article
Edelstein Effect in Isotropic and Anisotropic Rashba Models
by Irene Gaiardoni, Mattia Trama, Alfonso Maiellaro, Claudio Guarcello, Francesco Romeo and Roberta Citro
Condens. Matter 2025, 10(1), 15; https://doi.org/10.3390/condmat10010015 - 4 Mar 2025
Viewed by 777
Abstract
We investigate spin-to-charge conversion via the Edelstein effect in a 2D Rashba electron gas using the semiclassical Boltzmann approach. We analyze the magnetization arising from the direct Edelstein effect, taking into account an anisotropic Rashba model. We study how this effect depends on [...] Read more.
We investigate spin-to-charge conversion via the Edelstein effect in a 2D Rashba electron gas using the semiclassical Boltzmann approach. We analyze the magnetization arising from the direct Edelstein effect, taking into account an anisotropic Rashba model. We study how this effect depends on the effective masses and Rashba spin–orbit coupling parameters, extracting analytical expressions for the high electronic density regime. Indeed, it is possible to manipulate the anisotropy introduced into the system through these parameters to achieve a boost in the Edelstein response compared to the isotropic Rashba model. We also discuss the theoretical framework to study the inverse Edelstein effect and calculate self-consistently the electric current induced by the proximity of the system to a ferromagnet. These results provide insights into the role of Rashba spin–orbit coupling and anisotropic effects in spin–charge conversion phenomena. Full article
(This article belongs to the Special Issue Fluctuations and Highly Non-linear Phenomena in Superfluids and Superconductors VIII)
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11 pages, 480 KiB  
Article
Electron Density and Compressibility in the Kitaev Model with a Spatially Modulated Phase in the Superconducting Pairing
by Fabián G. Medina Cuy and Fabrizio Dolcini
Condens. Matter 2025, 10(1), 14; https://doi.org/10.3390/condmat10010014 - 28 Feb 2025
Viewed by 443
Abstract
A current flowing through a one-dimensional Kitaev chain induces a spatial modulation in its superconducting pairing, characterized by a wavevector Q, which is known to induce two types of topological phase transitions: one is the customary band topology transition between gapped phases, [...] Read more.
A current flowing through a one-dimensional Kitaev chain induces a spatial modulation in its superconducting pairing, characterized by a wavevector Q, which is known to induce two types of topological phase transitions: one is the customary band topology transition between gapped phases, while the other is a Lifshitz transition related to the Fermi surface topology and leading to a gapless superconducting phase. We investigate the behavior of the electron density ρ and the compressibility κ across the two types of transitions, as a function of the model parameters. We find that the behavior of ρ as a function of Q and chemical potential μ enables one to infer the ground state phase diagram. Moreover, the analysis of the compressibility κ as a function of μ enables one to distinguish the two transitions: While κ exhibits a symmetric divergence across the band topology transition, it displays an asymmetric jump across the Lifshitz transition. Full article
(This article belongs to the Special Issue Fluctuations and Highly Non-linear Phenomena in Superfluids and Superconductors VIII)
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11 pages, 826 KiB  
Article
Density Collective Modes of Exciton Superfluidity in Bilayer Systems
by Filippo Pascucci, Sara Conti, David Neilson, Andrea Perali and Jacques Tempere
Condens. Matter 2025, 10(1), 7; https://doi.org/10.3390/condmat10010007 - 16 Jan 2025
Viewed by 895
Abstract
We propose a new way to establish the existence of a superfluid phase in an exciton bilayer system by exploiting the properties of its collective modes. We focus on the density collective modes and treat them within Random Phase Approximation. By comparing results [...] Read more.
We propose a new way to establish the existence of a superfluid phase in an exciton bilayer system by exploiting the properties of its collective modes. We focus on the density collective modes and treat them within Random Phase Approximation. By comparing results for the normal and superfluid states, we are able to identify unambiguous fingerprints of the exciton superfluid phase. We compare the collective modes of the exciton system and cold atom systems, and we discuss the collective modes of the exciton superfluid order parameter. Full article
(This article belongs to the Special Issue Fluctuations and Highly Non-linear Phenomena in Superfluids and Superconductors VIII)
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16 pages, 326 KiB  
Article
Quantum Kinetic Theory of the Spin Hall Effect for Disordered Graphene with Rashba Spin–Orbit Coupling
by Roberto Raimondi and Thierry Valet
Condens. Matter 2025, 10(1), 4; https://doi.org/10.3390/condmat10010004 - 6 Jan 2025
Viewed by 1075
Abstract
The spin Hall effect for the model Hamiltonian of graphene with Rashba spin–orbit coupling is analyzed by means of a recently derived quantum kinetic theory of the linear response for multi-band electron systems. The latter expresses the interband part of the density matrix [...] Read more.
The spin Hall effect for the model Hamiltonian of graphene with Rashba spin–orbit coupling is analyzed by means of a recently derived quantum kinetic theory of the linear response for multi-band electron systems. The latter expresses the interband part of the density matrix in terms of the intraband occupation numbers, which can be obtained as solutions of a Boltzmann transport equation. The analysis, which, in the case of the model here considered, can be carried out in a completely analytical way, thus provides an effective pedagogical illustration of the general theory. While our results agree with those previously obtained with alternative approaches for the same model, our comparatively simpler and more physically transparent derivation illustrates the advantages of our formalism when dealing with non trivial multi-band Hamiltonians. Full article
(This article belongs to the Special Issue Fluctuations and Highly Non-linear Phenomena in Superfluids and Superconductors VIII)
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