A5102981054- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Ionic liquids properties and applications
- Molecular Junctions and Nanostructures
- Advanced Photocatalysis Techniques
- Advanced Condensed Matter Physics
- Inorganic and Organometallic Chemistry
- Electrocatalysts for Energy Conversion
- TiO2 Photocatalysis and Solar Cells
- Atomic and Subatomic Physics Research
- Supercapacitor Materials and Fabrication
- Catalytic Processes in Materials Science
- 2D Materials and Applications
- Advanced battery technologies research
- Phase-change materials and chalcogenides
- Fuel Cells and Related Materials
- CO2 Reduction Techniques and Catalysts
- Ammonia Synthesis and Nitrogen Reduction
- Photorefractive and Nonlinear Optics
- Quantum, superfluid, helium dynamics
- Nanofabrication and Lithography Techniques
- Rare-earth and actinide compounds
- Carbon dioxide utilization in catalysis
- Quantum Dots Synthesis And Properties
Helmholtz Institute Erlangen-Nürnberg
2023-2024
Forschungszentrum Jülich
2024
Friedrich-Alexander-Universität Erlangen-Nürnberg
2024
University of Chinese Academy of Sciences
2020-2021
Missouri University of Science and Technology
2016-2018
University of Jinan
2016
Quantum computers need new materials to protect their delicate quantum states. Evidence for such a material---a topological superconductor---has been detected as breaking of rotational symmetry in crystal Nb-doped Bi${}_{2}$Se${}_{3}$.
Lanthanide perovskite oxides have attracted much attention as an oxygen reduction and evolution catalyst because of their high chemical stability composition adjustability. A defect strategy has been applied to enhance electrocatalytic activity with the modulation crystal/electronic structure. However, intrinsic roles defects, particularly A-site vacancies, are poorly understood. Herein, we prepare LaxNiO3 various ratios vacancies by a facile nonstoichiometric strategy, which boosted...
The low-temperature variation of the London penetration depth $\ensuremath{\lambda}(T)$ in candidate topological superconductor ${\mathrm{Nb}}_{x}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3} (x=0.25)$ is reported for several crystals. measurements were carried out by means a tunnel-diode oscillator technique both field orientations (${H}_{\mathrm{rf}}\ensuremath{\parallel}c$ and ${H}_{\mathrm{rf}}\ensuremath{\parallel}ab$ planes). All samples exhibited power-law behavior at low temperatures...
Ca<sup>2+</sup>/F<sup>−</sup> co-doping mitigates P2–O2 transition and Na<sup>+</sup>/vacancy ordering in P2-type Na<sub>2/3</sub>Ni<sub>1/3</sub>Mn<sub>2/3</sub>O<sub>2</sub>, which significantly improves the rate capability cycling performance due to synergy of Ca<sup>2+</sup> F<sup>−</sup>.
We present resistivity and magnetization measurements on proton-irradiated crystals demonstrating that the superconducting state in doped topological superconductor Nb$_x$Bi$_2$Se$_3$ (x = 0.25) is surprisingly robust against disorder-induced electron scattering. The transition temperature $T_c$ decreases without indication of saturation with increasing defect concentration, corresponding scattering rates far surpass expectations based conventional theory. low-temperature variation London...
Topological insulator ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ has shown a number of interesting physical properties. Doping with copper or strontium been demonstrated to make the material superconducting and potentially even topological superconductor. The recent discovery niobium-doped reveals an exciting new phenomenon, coexistence superconductivity magnetic ordering, as well signatures odd-parity $p$-wave order. To understand this detailed knowledge electronic structure is needed. We present...
Inexpensive and efficient electrocatalysts are crucial for the development practical application of energy conversion storage technologies. Layered-double-hydroxide (LDH) materials have attracted much attention due to special layered structure, but their electrocatalytic activity stability still limited. Herein, we propose tune Co2+ occupancy coordination in cobalt-based LDH nanosheets via Fe3+ doping stable electrocatalysis oxygen evolution reaction (OER). It is found that Fe regulates CoO4...
Fascinating phenomena have been known to arise from the Dirac theory of relativistic quantum mechanics, which describes high energy particles having linear dispersion relations. Electrons in solids usually non-relativistic relations but their excitations can mimic effects. In topological insulators, electrons both a relation, behavior, on surface and bulk. Topological phases matter attracted much interest, particularly broken-symmetry insulator materials. Here, we report by Nb doping that...
We study unconventional superconductivity in exfoliated single crystals of a promising three-dimensional (3D) topological superconductor candidate, Nb-doped Bi2Se3 through differential conductance spectroscopy and magneto-transport. The strong anisotropy the critical field along out-of-plane direction suggests that thin flakes are quasi-2D limit. Normal metal-superconductor (NS) contacts with either high or low transparencies made by depositing gold leads onto both show significant...
Ferromagnetic domain behavior has been recently reported in Cr and V codoped topological insulator (TI) films using magnetic imaging, providing direct evidence for long-range ferromagnetic order. The observed robust ferromagnetism explains the significant increase anomalous quantum Hall effect (AQHE) TI thin films. To understand mechanism of such enhancement, it is imperative to investigate spatial distribution dopants their defect states. Here, authors report electronic fingerprints...
The development of low-cost and efficient electrocatalysts for oxygen reduction reaction (ORR) is prime importance to the emerging renewable energy technologies. Herein, a series LaFeO3−δ/NrGO-x (x = 10, 20, 25) hybrid materials have been synthesized via facile strategy that enhanced ORR performances in alkaline solutions owing strong coupling effect between defect-rich LaFeO3−δ perovskite nanoparticles N-doped reduced graphene oxide (NrGO) nanosheets. Among oxygen-deficient...
Modification of electrocatalysts with ionic liquids (ILs) allows us to control the activity and selectivity on one hand but also directly affects stability electrode. In this work, we studied interaction IL 1-ethyl-3-methylimidazolium dicyanamide [C2C1Im][DCA] a Au(111) surface in an aqueous electrolyte (phosphate buffer, pH 7) impact electrochemical surface. We combined complementary situ methods, namely, infrared reflection absorption spectroscopy (EC-IRRAS), cyclic voltammetry (CV),...
Electrocatalysts design has been an important researching discipline in the filed of electrochemical energy conversion and storage, among which, surface (organic) modification becoming efficient, selective, flexible approach electrocatalysis study applications. In focus direct modulation on interfaces, functionalization metallic catalysts with organic ligands (i. e. functional molecule, ionomers, ionic liquids) demonstrated its capacity improving catalytic activity selectivity reactions such...