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Condens. Matter, Volume 3, Issue 1 (March 2018)

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Editorial

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Open AccessEditorial Acknowledgement to Reviewers of Condensed Matter in 2017
Condens. Matter 2018, 3(1), 3; doi:10.3390/condmat3010003
Received: 11 January 2018 / Revised: 11 January 2018 / Accepted: 11 January 2018 / Published: 12 January 2018
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Abstract
Peer review is an essential part in the publication process, ensuring that Condensed Matter maintains high quality standards for its published papers[...] Full article
Open AccessEditorial Layered Superconductors
Condens. Matter 2018, 3(1), 4; doi:10.3390/condmat3010004
Received: 10 January 2018 / Revised: 30 January 2018 / Accepted: 30 January 2018 / Published: 1 February 2018
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Abstract
Since the discovery of cuprates (Cu-oxide superconductors) in 1986 [1–4], layered superconductors have attracted much attention, due to the emergence of high-transition-temperature (high-Tc) and unconventional superconductivity. Full article
(This article belongs to the Special Issue Layered Superconductors)

Research

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Open AccessArticle Single Crystal Growth and Superconducting Properties of Antimony-Substituted NdO0.7F0.3BiS2
Condens. Matter 2018, 3(1), 1; doi:10.3390/condmat3010001
Received: 25 October 2017 / Revised: 18 December 2017 / Accepted: 19 December 2017 / Published: 27 December 2017
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Abstract
Antimony (Sb) substitution of less than 8% was examined on a single crystal of a layered superconductor NdO0.7F0.3BiS2. The superconducting transition temperature of the substituted samples decreased as Sb concentration increased. A lattice constant along the c
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Antimony (Sb) substitution of less than 8% was examined on a single crystal of a layered superconductor NdO0.7F0.3BiS2. The superconducting transition temperature of the substituted samples decreased as Sb concentration increased. A lattice constant along the c-axis showed a large decrease compared with that along the a-axis. Since in-plane chemical pressure monotonically decreased as Sb concentration increased, the suppression of the superconductivity is attributed to the decrease in the in-plane chemical pressure. Full article
(This article belongs to the Special Issue Layered Superconductors)
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Open AccessArticle Two-Time Correlation Functions in Dissipative and Interacting Bose–Hubbard Chains
Condens. Matter 2018, 3(1), 2; doi:10.3390/condmat3010002
Received: 6 December 2017 / Revised: 29 December 2017 / Accepted: 31 December 2017 / Published: 3 January 2018
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Abstract
A method is presented for the systematic derivation of a hierarchy of coupled equations for the computation of two-time correlation functions of operators for open many-body quantum systems. We show how these systems of equations can be closed in mean-field and beyond approximations.
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A method is presented for the systematic derivation of a hierarchy of coupled equations for the computation of two-time correlation functions of operators for open many-body quantum systems. We show how these systems of equations can be closed in mean-field and beyond approximations. Results for the specific example of the spectral weight functions are discussed. Our method allows one to access the full temporal evolution, not just the stationary solution, of non-equilibrium open quantum problems described by a Markovian master equation. Full article
(This article belongs to the Special Issue Proceedings of the conference SuperFluctuations 2017)
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Open AccessArticle Effects of Symmetry Breaking in Resonance Phenomena
Condens. Matter 2018, 3(1), 5; doi:10.3390/condmat3010005
Received: 30 November 2017 / Revised: 28 December 2017 / Accepted: 30 January 2018 / Published: 1 February 2018
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Abstract
We show that resonance phenomena can be treated as nonequilibrium phase transitions. Resonance phenomena, similar to equilibrium phase transitions, are accompanied by some kind of symmetry breaking and can be characterized by order parameters. This is demonstrated for spin-wave resonance, helicon resonance, and
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We show that resonance phenomena can be treated as nonequilibrium phase transitions. Resonance phenomena, similar to equilibrium phase transitions, are accompanied by some kind of symmetry breaking and can be characterized by order parameters. This is demonstrated for spin-wave resonance, helicon resonance, and spin-reversal resonance. Full article
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Open AccessArticle VUV Pump and Probe of Phase Separation and Oxygen Interstitials in La2NiO4+y Using Spectromicroscopy
Condens. Matter 2018, 3(1), 6; doi:10.3390/condmat3010006
Received: 17 January 2018 / Revised: 8 February 2018 / Accepted: 9 February 2018 / Published: 11 February 2018
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Abstract
While it is known that strongly correlated transition metal oxides described by a multi-band Hubbard model show microscopic multiscale phase separation, little is known about the possibility to manipulate them with vacuum ultraviolet (VUV), 27 eV lighting. We have investigated the photo-induced effects
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While it is known that strongly correlated transition metal oxides described by a multi-band Hubbard model show microscopic multiscale phase separation, little is known about the possibility to manipulate them with vacuum ultraviolet (VUV), 27 eV lighting. We have investigated the photo-induced effects of VUV light illumination of a super-oxygenated La2NiO4+y single crystal by means of scanning photoelectron microscopy. VUV light exposure induces the increase of the density of states (DOS) in the binding energy range around Eb = 1.4 eV below EF. The photo-induced states in this energy region have been predicted due to clustering of oxygen interstitials by band structure calculations for large supercell of La2CuO4.125. We finally show that it is possible to generate and manipulate oxygen rich domains by VUV illumination as it was reported for X-ray illumination of La2CuO4+y. This phenomenology is assigned to oxygen-interstitials ordering and clustering by photo-illumination forming segregated domains in the La2NiO4+y surface. Full article
(This article belongs to the Special Issue New Trends in Quantum Complex Matter)
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Open AccessArticle Ground-State Magnetization in Mixtures of a Few Ultra-Cold Fermions in One-Dimensional Traps
Condens. Matter 2018, 3(1), 7; doi:10.3390/condmat3010007
Received: 31 January 2018 / Revised: 28 February 2018 / Accepted: 5 March 2018 / Published: 6 March 2018
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Abstract
Ground-state properties of a few spin-1/2 ultra-cold fermions confined in a one-dimensional trap are studied by the exact diagonalization method. In contrast to previous studies, it is not assumed that the projection of a spin of individual particles is fixed.
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Ground-state properties of a few spin- 1 / 2 ultra-cold fermions confined in a one-dimensional trap are studied by the exact diagonalization method. In contrast to previous studies, it is not assumed that the projection of a spin of individual particles is fixed. Therefore, the spin is treated as an additional degree of freedom and the global magnetization of the system is established spontaneously. Depending on the shape of the trap, inter-particle interactions, and an external magnetic field, the phase diagram of the system is determined. It is shown that, for particular confinements, some values of the magnetization cannot be reached by the ground-state of the system. Full article
(This article belongs to the Special Issue New Trends in Quantum Complex Matter)
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Open AccessArticle The BKT Universality Class in the Presence of Correlated Disorder
Condens. Matter 2018, 3(1), 8; doi:10.3390/condmat3010008
Received: 30 January 2018 / Revised: 5 March 2018 / Accepted: 6 March 2018 / Published: 9 March 2018
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Abstract
The correct detection of the Berezinskii-Kosterlitz-Thouless (BKT) transition in quasi-two-dimensional superconductors still remains a controversial issue. Its main signatures, indeed, are often at odds with the theoretical expectations. In a recent work (Maccari, I.; Benfatto, L.; Castellani, C. Phys. Rev. B 2017, 96,
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The correct detection of the Berezinskii-Kosterlitz-Thouless (BKT) transition in quasi-two-dimensional superconductors still remains a controversial issue. Its main signatures, indeed, are often at odds with the theoretical expectations. In a recent work (Maccari, I.; Benfatto, L.; Castellani, C. Phys. Rev. B 2017, 96, 060508), we have shown that the presence of spatially correlated disorder plays a key role in this sense because it is the reason underlying the experimentally-observed smearing of the universal superfluid-density jump. In the present paper we closely investigate the effects of correlated disorder on the BKT transition, specifically addressing the issue of whether or not it changes the BKT universality class. Full article
(This article belongs to the Special Issue Proceedings of the conference SuperFluctuations 2017)
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Open AccessArticle Fermionic Properties of Two Interacting Bosons in a Two-Dimensional Harmonic Trap
Condens. Matter 2018, 3(1), 9; doi:10.3390/condmat3010009
Received: 30 January 2018 / Revised: 9 March 2018 / Accepted: 12 March 2018 / Published: 15 March 2018
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Abstract
The system of two interacting bosons in a two-dimensional harmonic trap is compared with the system consisting of two noninteracting fermions in the same potential. In particular, we discuss how the properties of the ground state of the system, e.g., the different contributions
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The system of two interacting bosons in a two-dimensional harmonic trap is compared with the system consisting of two noninteracting fermions in the same potential. In particular, we discuss how the properties of the ground state of the system, e.g., the different contributions to the total energy, change as we vary both the strength and range of the atom–atom interaction. In particular, we focus on the short-range and strong interacting limit of the two-boson system and compare it to the noninteracting two-fermion system by properly symmetrizing the corresponding degenerate ground state wave functions. In that limit, we show that the density profile of the two-boson system has a tendency similar to the system of two noninteracting fermions. Similarly, the correlations induced when the interaction strength is increased result in a similar pair correlation function for both systems. Full article
(This article belongs to the Special Issue Proceedings of the conference SuperFluctuations 2017)
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