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Nanomaterials
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Recent Advances in Nanowires and Superconductors (Second Edition)
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Recent Advances in Nanowires and Superconductors (Second Edition)

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanoelectronics, Nanosensors and Devices".

Deadline for manuscript submissions: closed (10 November 2024) | Viewed by 2932

Special Issue Editor

Dr. Fabio Cavaliere

E-Mail Website
Guest Editor
1. Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
2. CNR-SPIN, Via Dodecaneso 33, 16146 Genova, Italy
Interests: quantum condensed matter theory; quantum thermodynamics; correlated electron systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is a continuation of a previous Special Issue, “Recent Advances in Nanowires and Superconductors”.

Advancements in the theoretical and experimental understanding of quantum wires (QWs), ranging from semiconductors and carbon nanotubes (CNTs) to topological insulators (TIs), have led to the proposal and observation of a plethora of novel physical phenomena. In view of this rich and exciting scenario, it is compelling to assess where the cutting edge of research in this field lies. This is the goal of this Special Issue.

Very recently, the formation of elusive Wigner molecules has been proven in suspended CNT QWs, and it has finally been theoretically understood how such a phenomenon implies a quantum phase transition at zero temperature. At finite temperature, one of the most natural theoretical models to describe this molecule is the spin-incoherent Luttinger liquid, whose existence has been shown in trapped 1D cold atoms yet remains to be confirmed in condensed matter. For weaker interactions, one method lies in harvesting non-linear effects, which may even lead to unconventional nanophotonic devices.

Even in a weakly interacting context, interesting physics may arise in wires made of non-trivial materials such as TIs and in spin–orbit coupled insulators. Such systems are interesting on their own, and even more so when proximized with superconductors. Indeed, Majorana and parafermionic modes may arise, which can be exploited to implement topologically protected quantum computation.

Connecting and possibly stacking several such QWs is a required goal in order to control and exploit the properties of Majorana and parafermionic modes, to build individual quantum gates and, eventually, to scale up towards complex quantum circuits. Beyond their usefulness in topological quantum computation, superlattices of QWs show novel collective phenomena, leading, for instance, to new optical transitions and vibrational properties. In addition, the procedure of “wire construction” has been theoretically exploited to tackle the study of exotic states of matter, such as the Fractional Quantum Hall Effect.

We hope that this Special Issue will contribute to the cross-fertilization of the different subfields mentioned above.

Dr. Fabio Cavaliere
Guest Editor

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. Nanomaterials is an international peer-reviewed open access semimonthly 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 2400 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

  • quantum wires
  • superconductors
  • carbon nanotubes
  • topological insulators
  • spin–orbit
  • Majorana fermions
  • parafermions
  • superlattices
  • topologically protected quantum computation
  • Luttinger liquids

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Related Special Issue

Published Papers (2 papers)

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Research

25 pages, 6294 KiB  
Article
Transition to Metallic and Superconducting States Induced by Thermal or Electrical Deoxidation of the Dislocation Network in the Surface Region of SrTiO3
by Krzysztof Szot, Christian Rodenbücher, Krzysztof Rogacki, Gustav Bihlmayer, Wolfgang Speier, Krystian Roleder, Franciszek Krok, Hugo Keller, Arndt Simon and Annette Bussmann-Holder
Nanomaterials 2024, 14(23), 1944; https://doi.org/10.3390/nano14231944 - 4 Dec 2024
Viewed by 1075
Abstract
The question as to why deoxidized SrTiO3−δ becomes metallic and superconducting at extremely low levels of oxygen vacancy concentration has been a mystery for many decades. Here, we show that the real amount of effused oxygen during thermal reduction, which is needed [...] Read more.
The question as to why deoxidized SrTiO3−δ becomes metallic and superconducting at extremely low levels of oxygen vacancy concentration has been a mystery for many decades. Here, we show that the real amount of effused oxygen during thermal reduction, which is needed to induce superconducting properties, is in the range of only 1014/cm3 and thus even lower than the critical carrier concentrations assumed previously (1017–1019/cm3). By performing detailed investigations of the optical and electrical properties down to the nanoscale, we reveal that filaments are forming during reduction along a network of dislocations in the surface layer. Hence, a reduced epi-polished SrTiO3−δ crystal has to be regarded as a nano-composite consisting of a perfect dielectric matrix with negligible carrier density, which is short-circuited by metallic filaments with a local carrier density in the range of 1020/cm3. We present that electro-degradation leads to a more pronounced evolution of filamentary bundles and thus can generate a superconducting state with higher TC than thermal reduction. These findings indicate that traditional homogeneous models of superconductivity in self-doped SrTiO3−δ need to be revised, and we propose an alternative explanation taking into account the coexistence of metallic dislocation cores with polar insulating regions allowing for polaronic coupling. Full article
(This article belongs to the Special Issue Recent Advances in Nanowires and Superconductors (Second Edition))
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9 pages, 4295 KiB  
Article
Large-Scale Green Method for Synthesizing Ultralong Uniform Tellurium Nanowires for Semiconductor Devices
by Zhiyi Lyu, Mose Park, Yanjin Tang, Hoon Choi, Seung Hyun Song and Hoo-Jeong Lee
Nanomaterials 2024, 14(20), 1625; https://doi.org/10.3390/nano14201625 - 10 Oct 2024
Viewed by 1433
Abstract
This study presents a large-scale green approach for synthesizing ultralong tellurium nanowires with diameters around 13 nm using a solution-based method. By adjusting key synthesis parameters such as the surfactant concentration, temperature, and reaction duration, we achieved high-quality, ultralong Te NWs. These nanowires [...] Read more.
This study presents a large-scale green approach for synthesizing ultralong tellurium nanowires with diameters around 13 nm using a solution-based method. By adjusting key synthesis parameters such as the surfactant concentration, temperature, and reaction duration, we achieved high-quality, ultralong Te NWs. These nanowires exhibit properties suitable for use in semiconductor applications, particularly when employed as channel materials in thin-film transistors, displaying a pronounced gate effect with a high switch of up to 104 and a mobility of 0.9 cm2 V−1s−1. This study underscores the potential of solvent-based methods in synthesizing large-scale ultralong Te NWs as a critical resource for future sustainable nanoelectronic devices. Full article
(This article belongs to the Special Issue Recent Advances in Nanowires and Superconductors (Second Edition))
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