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Introduction
Centrifugation is a widely used method for sorting suspensions of polydisperse 2D nanosheets according to size. However, no a priori models are available to predict the outcome of centrifugation, making time-consuming iterative experiments necessary. In this article, we present a simple model for the behavior of 2D nanosheets during centrifugation and benchmark its predictions against experiments.
Theoretical Background
The model uses simple expressions, specific to 2D particles, for the hydrodynamic radius, effective density, and viscous resistance to generate the equation of motion of individual nanosheets during centrifugation. The equation of motion is then used to predict nanosheet size distributions within centrifugation products.
Results and Discussion
Comparison with experimental data demonstrates the robustness of this model for a range of 2D materials and solvent systems, and its ability to describe subtle effects. These results will enable more tailored size selection of nanosheets for specific applications and offer new mechanistic insights to optimize exfoliation conditions.
Conclusion
In conclusion, our model provides a simple and effective way to predict the outcome of centrifugation, allowing for more efficient and accurate size selection of 2D nanosheets. This will have significant implications for the development of new materials and applications in fields such as electronics, energy storage, and biomedicine.
Introduction
The successful development of optoelectronic devices is contingent on a detailed understanding of interactions between light and excited energy states in photoactive materials. In 2D perovskites, excitons are the dominant photogenerated species and their energetic structure plays a pivotal role, governing photon absorption and emission processes.
Theoretical Background
In these materials, dark exciton states can undergo photoluminescence due to the relaxation of selection rules and this process can be modulated by an external magnetic field, enabling unambiguous identification of the exciton fine structure.
Results and Discussion
We use magneto-optical microscopy for the first time on perovskite materials to elucidate the spatial variation of exciton emission processes. In 2D perovskite thin films, we distinguish between regions of localised bright and dark exciton populations, correlated to the film morphology. In single crystals, we show that dark excitons become localised at the edges, where excitons can be trapped in two distinct types of sub-gap states.
Conclusion
This work represents significant progress in understanding the properties of exciton emission in 2D perovskites, which is crucial for the development of optoelectronic technology.
Introduction
Estimating the tortuosity of porous electrodes is important for understanding the performance of lithium-ion batteries and optimizing the design of electrode microstructures.
Theoretical Background
A new method for estimating the tortuosity of porous electrodes is proposed based on radical tessellation, and the results agree well with those calculated by empirical formulas and finite element simulations.
Results and Discussion
The influence of different microstructure characters on the tortuosity is discussed. It is found that in addition to the porosity, the particle size and particle aggregation morphology are all critical in influencing the tortuosity of the porous electrode.
Conclusion
The tortuosity obtained by this method is integrated into the Pseudo-2-dimensional (P2D) model for the calculation of effective properties, and the results show that this method offers an efficient way in improving the prediction accuracy of P2D models.
Introduction
Flat bands with small energy dispersion can give rise to strongly correlated electronic and topological phases, especially when located at the Fermi level.
Theoretical Background
Geometrically frustrated kagome lattices have emerged as an attractive platform as they natively host flat bands that have been observed experimentally in quasi-2D bulk-crystal kagome metals.
Results and Discussion
We use angle-resolved photoelectron spectroscopy, scanning tunnelling microscopy and band structure calculations to show that ultra-thin films of the kagome metal Mn3Sn host a robust dispersionless flat band with a bandwidth of 50 meV.
Conclusion
The realization of tunable kagome-derived flat bands in an ultra-thin kagome metal, represents a promising platform to study strongly correlated and topological phenomena, with applications in quantum computing, spintronics and low-energy electronics.
Introduction
Relativistic effects influence the motion of charged particles in solids by intertwining spin and momentum.
Theoretical Background
The two-dimensional hole gas formed in group IV heterostructures is a particularly promising platform, owning to a notable spin-orbit coupling.
Results and Discussion
We use the modulation-doping technique to break inversion symmetry at novel Ge1-xSnx/Ge interfaces and explore spin-orbit phenomena in the emergent Rashba-coupled hole gases.
Conclusion
Ge1-xSnx quantum wells thus offer innovative solutions and functionalities stemming from their unique spin-dependent properties and intriguing quantum phenomena at the crossroad between transport and photonic realms.
Introduction
Atomically thin van der Waals (vdW) magnets have emerged as a fascinating platform for the exploration of novel physical phenomena arising from their reduced dimensionality and exceptional material properties.
Theoretical Background
Antiferromagnetic (AF) vdW magnets are of particular interest, as they combine the advantages of vdW magnets with the functionality of AF spintronics, offering unique opportunities for ultrafast and robust spintronic devices.
Results and Discussion
We introduce a fundamentally new paradigm in nanomagnetism, which we term lateral exchange bias (LEB), to achieve Néel vector control in bilayers of the vdW AF CrSBr.
Conclusion
Our results challenge conventional views on exchange bias and provide a previously unexplored mechanism for achieving atomic-scale control of AFic order.
Introduction
Topological insulators (TIs) are intriguing materials for advanced computing applications based on spintronics because they can host robust spin effects.
Theoretical Background
For instance, TIs have intrinsically large spin generation enabled by their large spin-orbit coupling.
Results and Discussion
We grow epitaxial films of BiSbTeSe (BSTS, ) and confirm the gapless band structure with optimal doping using angle-resolved photoelectron spectra.
Conclusion
Further development of high-quality TIs will make them viable candidates for efficient and lossless spintronics.
Introduction
The magnetic properties of the double perovskite oxide FeMo are analyzed using a mixed-spin Ising model with spins $\left( \frac{1}{2},\frac{5}{2}\right) $ in the presence of a random crystal field and exchange interactions $ J $ on a three-dimensional (3D) cubic lattice.
Theoretical Background
The study employs both the Mean-Field Approximation (MFA) based on the Bogoliubov inequality for Gibbs free energy and Monte Carlo (MC) simulations using the Metropolis algorithm to provide a comprehensive analysis of the system's phase transitions and magnetization behavior.
Results and Discussion
We establish the ground-state phase diagram, identifying multiple stable magnetic configurations and first-order transitions at low temperatures.
Conclusion
This work provides deeper insight into the thermodynamic, physics statistic and magnetic properties of FeMo, with implications for future applications in spintronics and magnetic storage technologies.
Introduction
Semiconductor-based spin qubits embedded into a superconducting microwave cavity constitute a fast-progressing and promising platform for realizing fast and fault-tolerant qubit control with long-range two-qubit coupling.
Theoretical Background
The flopping-mode spin qubit consists of a single electron in a double quantum dot; it combines a charge qubit with a spin qubit.
Results and Discussion
We combine the flopping-mode concept with the ST and EO qubits and propose two new flopping-mode qubits that consist of three (four) quantum dots, occupied by two (three) electrons near the (1,0,1) - (0,1,1) [(1,0,1,1) -- (0,1,1,1)] charge transition.
Conclusion
Our results demonstrate the potential of these quantum dots for precise spin manipulation and their relevance for future quantum hardware.
Introduction
We report our investigations on Ag3LiIr1.4Ru0.6O6
Q&A: Exploring the Latest Research in Condensed Matter Physics
Q: What is the significance of the recent discovery of a three-dimensional flat band in ultra-thin Kagome metal Mn3Sn film?
A: The discovery of a three-dimensional flat band in ultra-thin Kagome metal Mn3Sn film is significant because it represents a promising platform to study strongly correlated and topological phenomena. Flat bands with small energy dispersion can give rise to strongly correlated electronic and topological phases, especially when located at the Fermi level.
Q: How does the modulation-doping technique used in the study of the two-dimensional hole gas in Ge1-xSnx/Ge interfaces affect the spin-orbit phenomena?
A: The modulation-doping technique used in the study of the two-dimensional hole gas in Ge1-xSnx/Ge interfaces breaks inversion symmetry, allowing for the exploration of spin-orbit phenomena in the emergent Rashba-coupled hole gases.
Q: What is the significance of the lateral exchange bias (LEB) introduced in the study of atomically thin antiferromagnets?
A: The lateral exchange bias (LEB) introduced in the study of atomically thin antiferromagnets represents a fundamentally new paradigm in nanomagnetism, allowing for the achievement of Néel vector control in bilayers of the vdW AF CrSBr.
Q: How does the intrinsic spin transport in a topological insulator thin film differ from other materials?
A: The intrinsic spin transport in a topological insulator thin film is unique because it is enabled by the large spin-orbit coupling, allowing for the generation of robust spin effects.
Q: What is the significance of the mixed-spin Ising model used in the study of the magnetic properties of the double perovskite oxide Sr2FeMo6?
A: The mixed-spin Ising model used in the study of the magnetic properties of the double perovskite oxide Sr2FeMo6 provides a comprehensive analysis of the system's phase transitions and magnetization behavior, allowing for a deeper understanding of the thermodynamic, physics statistic, and magnetic properties of the material.
Q: How does the flopping-mode spin qubit differ from other spin qubits?
A: The flopping-mode spin qubit differs from other spin qubits because it combines a charge qubit with a spin qubit, allowing for the realization of fast and fault-tolerant qubit control with long-range two-qubit coupling.
Q: What is the significance of the recent discovery of a Kitaev quantum spin liquid in Ag3LiIr2O6?
A: The recent discovery of a Kitaev quantum spin liquid in Ag3LiIr2O6 is significant because it represents a promising platform to study strongly correlated and topological phenomena. The Kitaev quantum spin liquid is a type of quantum spin liquid that exhibits a unique magnetic structure and is expected to have interesting properties.
Q: How does the modulation-doping technique used in the study of the two-dimensional hole gas in Ge1-xSnx/Ge interfaces affect the spin-orbit phenomena?
A: The modulation-doping technique used in the study of the two-dimensional hole gas in Ge1-xSnx/Ge interfaces breaks inversion symmetry, allowing for the exploration of spin-orbit phenomena in the emergent Rashba-coupled hole gases.
Q: What is the significance of the lateral exchange bias (LEB) introduced in the study of atomically thin antiferromagnets?
A: The lateral exchange bias (LEB) introduced in the study of atomically thin antiferromagnets represents a fundamentally new paradigm in nanomagnetism, allowing for the achievement of Néel vector control in bilayers of the vdW AF CrSBr.
Q: How does the intrinsic spin transport in a topological insulator thin film differ from other materials?
A: The intrinsic spin transport in a topological insulator thin film is unique because it is enabled by the large spin-orbit coupling, allowing for the generation of robust spin effects.
Q: What is the significance of the mixed-spin Ising model used in the study of the magnetic properties of the double perovskite oxide Sr2FeMo6?
A: The mixed-spin Ising model used in the study of the magnetic properties of the double perovskite oxide Sr2FeMo6 provides a comprehensive analysis of the system's phase transitions and magnetization behavior, allowing for a deeper understanding of the thermodynamic, physics statistic, and magnetic properties of the material.
Q: How does the flopping-mode spin qubit differ from other spin qubits?
A: The flopping-mode spin qubit differs from other spin qubits because it combines a charge qubit with a spin qubit, allowing for the realization of fast and fault-tolerant qubit control with long-range two-qubit coupling.
Q: What is the significance of the recent discovery of a Kitaev quantum spin liquid in Ag3LiIr2O6?
A: The recent discovery of a Kitaev quantum spin liquid in Ag3LiIr2O6 is significant because it represents a promising platform to study strongly correlated and topological phenomena. The Kitaev quantum spin liquid is a type of quantum spin liquid that exhibits a unique magnetic structure and is expected to have interesting properties.
Q: What are the potential applications of the discoveries made in these studies?
A: The discoveries made in these studies have the potential to lead to the development of new materials and technologies with unique properties, such as topological insulators, superconductors, and quantum spin liquids. These materials and technologies could have a wide range of applications, including in the fields of electronics, energy storage, and quantum computing.
Q: How do these discoveries relate to the broader field of condensed matter physics?
A: These discoveries are significant because they represent a deeper understanding of the behavior of materials at the atomic and subatomic level. They have the potential to lead to the development of new materials and technologies with unique properties, and could have a wide range of applications in fields such as electronics, energy storage, and quantum computing.