Complexity in Quantum Materials: In Honor of Prof. K.A. Muller

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

Deadline for manuscript submissions: 31 May 2025 | Viewed by 5885

Special Issue Editors


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Guest Editor
Rome International Center for Materials Science Superstripes (RICMASS), Via dei Sabelli 119A, 00185 Roma, Italy
Interests: synchrotron radiation research; protein fluctuations; active sites of metalloproteins; origin of life; selected molecules in prebiotic world; quantum phenomena in complex matter; quantum confinement; superstripes in complex matter; lattice complexity in transition metal oxides; high Tc superconductors; valence fluctuation materials
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Special Issue Information

Dear Colleagues,

This Special Issue of the Condensed Matter journal is dedicated to Complexity in Quantum Materials collecting the papers presented at the K. Alex Müller Workshop held in Erice-Sicily August 3-9, 2023, and related matter. The topics cover in advances in understanding the key role of quantum complexity and intrinsic role of heterogeneity in unconventional quantum functionalities in condensed matter made of multiple chemical and electronic components at the nanoscale. The topics cover studies on first order structural phase transitions with emerging chemical nanoscale phase separation, dynamics of non-linear systems, Rashba spin–orbit coupling at interfaces in low dimension, pseudo Jahn Teller polarons, Majorana fermions, Majorana exchange interaction, unconventional electron–phonon interaction, electronic inhomogeneities, polarons condensation and pairing, symmetry and heterogeneity, superstripes, multi-condensates, BEC-BCS crossover, topological materials, ferroelectrics, perovskites and ultracold gases artificial quantum heterostructures, artificial cuprate superlattices, multi band superconductivity, the 3D superconductivity dome in cuprates driven by strain and doping, the unconventional superconductivity dome due to Fano Feshbach resonances near Lifshitz transitions, and complexity in the physics of Li-ion batteries and room temperature superconductors.

Prof. Dr. Antonio Bianconi
Prof. Dr. Annette Bussmann-Holder
Guest Editors

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Related Special Issue

Published Papers (4 papers)

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Editorial

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34 pages, 49917 KiB  
Editorial
Meeting and Working with K. Alex Müller: Personal Memories
by Annette Bussmann-Holder and Hugo Keller
Condens. Matter 2024, 9(2), 24; https://doi.org/10.3390/condmat9020024 - 8 May 2024
Viewed by 1177
Abstract
On 9 January 2023, K [...] Full article
(This article belongs to the Special Issue Complexity in Quantum Materials: In Honor of Prof. K.A. Muller)
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7 pages, 2671 KiB  
Editorial
Alex’s Vision in Functional Quantum Matter
by Davor Pavuna
Condens. Matter 2024, 9(2), 23; https://doi.org/10.3390/condmat9020023 - 18 Apr 2024
Viewed by 1008
Abstract
My ‘In Memoriam’ contribution is very personal, as it includes many human and professional insights that I received from Alex Müller himself [...] Full article
(This article belongs to the Special Issue Complexity in Quantum Materials: In Honor of Prof. K.A. Muller)
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Research

Jump to: Editorial

18 pages, 4725 KiB  
Communication
From Phonons to Domain Walls, the Central Peak and “Critical Slowing Down”
by Ekhard K. H. Salje and Annette Bussmann-Holder
Condens. Matter 2024, 9(4), 39; https://doi.org/10.3390/condmat9040039 - 1 Oct 2024
Viewed by 626
Abstract
We investigate perovskite oxides from different perspectives, namely their pseudo-harmonic dynamical properties, their dynamical properties when strong anharmonicity exists, and the intriguing functionalities arising from domain walls. Taking these viewpoints together yields a rather complex picture of this material class, which has not [...] Read more.
We investigate perovskite oxides from different perspectives, namely their pseudo-harmonic dynamical properties, their dynamical properties when strong anharmonicity exists, and the intriguing functionalities arising from domain walls. Taking these viewpoints together yields a rather complex picture of this material class, which has not been found in previous approaches. It opens pathways to novel applications and reveals the rich ground states beyond the fictitious belief in the ‘simplicity of perovskites and such structures’. Full article
(This article belongs to the Special Issue Complexity in Quantum Materials: In Honor of Prof. K.A. Muller)
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10 pages, 3016 KiB  
Article
SrTiO3: Thoroughly Investigated but Still Good for Surprises
by Annette Bussmann-Holder, Reinhard K. Kremer, Krystian Roleder and Ekhard K. H. Salje
Condens. Matter 2024, 9(1), 3; https://doi.org/10.3390/condmat9010003 - 6 Jan 2024
Cited by 2 | Viewed by 2308
Abstract
For decades, SrTiO3 has been in the focus of research with seemingly never-ending new insights regarding its ground state properties, application potentials, its surface and interface properties, the superconducting state, the twin boundaries, domain functionalities, etc. Here, we focus on the already [...] Read more.
For decades, SrTiO3 has been in the focus of research with seemingly never-ending new insights regarding its ground state properties, application potentials, its surface and interface properties, the superconducting state, the twin boundaries, domain functionalities, etc. Here, we focus on the already well-investigated lattice dynamics of STO and show that four different temperature regimes can be identified which dominate the elastic properties, the thermal conductivity, and the birefringence. These regimes are a low-temperature quantum fluctuation-dominated one, followed by an intermediate regime, a region of structural phase transition at ~105 K and its vicinity, and at high temperatures, a regime characterized by precursor and saturation effects. They can all be elucidated by lattice dynamical aspects. The relevant temperature dependences of the soft modes are discussed and their relationship to lattice polarizability is emphasized. Full article
(This article belongs to the Special Issue Complexity in Quantum Materials: In Honor of Prof. K.A. Muller)
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