Excited states of holographic superconductors with backreaction

Wang, Yongqiang; Li, Hongbo; Liu, Yu-Xiao; Zhong, Yin

doi:10.1140/epjc/s10052-021-09365-5

Cited by 18 publications

(10 citation statements)

References 43 publications

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“…Thermogravimetric analysis (TGA) as an accurate method, is used to determine the metal content in carbon materials [20] . From the TGA results (Figure 3a), the initial slight weight gain in the range of ≈100 to 320 °C is attributed to the gradual oxidation of the RuNi alloy, and the subsequent considerable weight loss should be due to the combustion of N‐doped carbon.…”

Section: Resultsmentioning

confidence: 99%

N‐Doped Carbon Shells Encapsulated Ru‐Ni Nanoalloys for Efficient Hydrogen Evolution Reaction

Wang

Shen

et al. 2023

ChemSusChem

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The alkaline hydrogen evolution reaction (HER) is of great significance for the large‐scale green H2 production. Currently, pressing challenges in the fabrication of cost‐effective HER electrocatalysts are related to their sluggish water dissociation kinetics. Herein, a facile strategy to accelerate the desorption of HER intermediates and water dissociation is proposed. RuNi nanoalloy confined within N‐doped carbon shells (Ru7Ni3@NC/C) with optimized Ru/Ni ratio and the dicyandiamide dosage was prepared. It displays an overpotential (η10) of 16 mV, Tafel slope of 29.9 mV dec−1, and long‐term stability over 10 000 cycles. The decent HER performance on Ru7Ni3@NC/C stems from the core‐shell structure that is favoring the exposure of dispersed active sites, and the synergistic effect to promote water capture and dissociation. This work provides insight into the relationship between the HER performance and the electrochemical behavior of the intermediate adsorbed state, and paves an avenue toward rational design efficient electrocatalysts for HER.

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Section: Resultsmentioning

confidence: 99%

N‐Doped Carbon Shells Encapsulated Ru‐Ni Nanoalloys for Efficient Hydrogen Evolution Reaction

Wang

Shen

et al. 2023

ChemSusChem

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“…This observation was confirmed by SEM, STEM, and EDS analyses of the Pd x Pt 1‐x ‐ECM with different compositions (Figures S19 and S20, Supporting Information), which showed a decrease in surface roughness and comprehensive coverage of Pt on the outermost layers as more Pt was involved, blocking the Pd from direct exposure to H 2 . [ 58,59 ]…”

Section: Resultsmentioning

confidence: 99%

“…This observation was confirmed by SEM, STEM, and EDS analyses of the Pd x Pt 1-x -ECM with different compositions (Figures S19 and S20, Supporting Information), which showed a decrease in surface roughness and comprehensive coverage of Pt on the outermost layers as more Pt was involved, blocking the Pd from direct exposure to H 2 . [58,59] Figure 5D shows that the chemiresistive responses were mostly linear in the range of 10-10 000 ppm H 2 . Notably, the Pd 0.99 Pt 0.01 -ECM-based sensor can reliably detect as low as 70 ppm H 2 (Figure 5E) due to the high porosity of the dECM.…”

Section: Synthesis Of Pd-based Metalized Decms and Their Utilization ...mentioning

confidence: 99%

Metallization of Targeted Protein Assemblies in Cell‐Derived Extracellular Matrix by Antibody‐Guided Biotemplating

Song,

Ahn,

Yong

et al. 2023

Advanced Science

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Biological systems are composed of hierarchical structures made of a large number of proteins. These structures are highly sophisticated and challenging to replicate using artificial synthesis methods. To exploit these structures in materials science, biotemplating is used to achieve biocomposites that accurately mimic biological structures and impart functionality of inorganic materials, including electrical conductivity. However, the biological scaffolds used in previous studies are limited to stereotypical and simple morphologies with little synthetic diversity because of a lack of control over their morphologies. This study proposes that the specific protein assemblies within the cell‐derived extracellular matrix (ECM), whose morphological features are widely tailorable, can be employed as versatile biotemplates. In a typical procedure, a fibrillar assembly of fibronectin—a constituent protein of the ECM—is metalized through an antibody‐guided biotemplating approach. Specifically, the antibody‐bearing nanogold is attached to the fibronectin through antibody–antigen interactions, and then metals are grown on the nanogold acting as a seed. The biomimetic structure can be adapted for hydrogen production and sensing after improving its electrical conductivity through thermal sintering or additional metal growth. This study demonstrates that cell‐derived ECM can be an attractive option for addressing the diversity limitation of a conventional biotemplate.

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“…However, it is already known that the scalar of excited states do not diverge in the zero temperature limit [8]. Furthermore, inclusion of back reaction does not eliminate these excited states, only leads to some quantitative differences [21]. Although those studies are for BH of zero topoligical charge, k = 0, we believe that the inclusion of back reaction do not change the qualitative conclusion of our work for finite k. We plan to include the effect of back reaction in a near future work to fully address this question.…”

Section: Jhep06(2022)004 4 Discussionmentioning

confidence: 99%

Asymptotic critical behavior of holographic superconductor phase transition — the spectrum of excited states becomes continuous at T = 0

Nguyen

Phat

2022

J. High Energ. Phys.

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Within the framework of AdS/CFT duality, excited states of the conformal field living at the global AdS boundary of a four-dimensional spacetime Einstein gravity are investigated analytically in the probe limit where the field equations are linearized. At asymptotically large values, the threshold chemical potential for the appearance of excited condensate states are discrete, equal spacing, with the gap approaches zero logarithmically in the limit T → 0. Remarkably, numerical results show that, this behavior applies even for states as low as for the first or the second excited state of the condensate. This is especially significant on the liquid side of the black hole van der Waals-like phase transition (small or zero topological charge) where there seems to be no gap between the ground state and the first excited state at zero temperature. We postulate that, at the exact limit T = 0 where the gap is zero, the spectrum of threshold chemical potentials becomes continuous, all excited states of the condensate are activated above a finite chemical potential, suggesting a new quantum phase transition as a function of the chemical potential. Previous studies have largely missed this continuous spectrum of excited states in the T → 0 limit. This fact should be taken into account carefully in AdS/CFT duality studies.

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Excited states of holographic superconductors with backreaction

Cited by 18 publications

References 43 publications

N‐Doped Carbon Shells Encapsulated Ru‐Ni Nanoalloys for Efficient Hydrogen Evolution Reaction

N‐Doped Carbon Shells Encapsulated Ru‐Ni Nanoalloys for Efficient Hydrogen Evolution Reaction

Metallization of Targeted Protein Assemblies in Cell‐Derived Extracellular Matrix by Antibody‐Guided Biotemplating

Asymptotic critical behavior of holographic superconductor phase transition — the spectrum of excited states becomes continuous at T = 0

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