bluuebunny/crossref_metadata_2025_split huggingface dataset:
Structure-controlled valley splitting and anomalous valley Hall effect in Janus VSe2/VSeX (X = S, Te) heterojunctions
Authors: Li C L , Wang N B , Hu G C , Yuan X B , Ren J F , Zhao X W 
Published: February 2023

Abstract
Ferrovalley materials possess spontaneous valley splitting and anomalous valley Hall effect (AVHE) characteristics, making this an ideal platform for valleytronic information devices. The efficient regulation of valley splitting and the anomalous Hall current is critical for the realization of information coding. In this work, to realize the regulation of valley properties, Janus VSe2/VSeX (X = S, Te) heterojunctions are investigated using first-principles calculations. Spontaneous valley splitting and the AVHE can be achieved in VSe2/VSeX. In addition, the asymmetrical structure, different stacking configurations of heterojunctions, and the intrinsic polarity of the Janus VSeX monolayer can regulate the band alignments, i.e. type-Ⅰ, -Ⅱ, and -Ⅲ band alignments can be realized, and they are accompanied with the switch between semiconductor and metal phases. Moreover, the structure-controlled valley states and AVHE are obtained. When altering the Janus VSeS and VSeTe, the K and K′ valleys possess contrary characteristics: opposite spin signs and valley splitting occurred. Accordingly, we design a low-power-consumption switch to achieve multistate storage without external field regulation. The results can provide an alternative avenue for spintronics and valleytronics devices.
Possible enhancement of the superconducting

Tc

due to sharp Kohn-like soft phonon anomalies
Authors: Jiang Cunyuan , Beneduce Enrico , Baggioli Matteo , Setty Chandan , Zaccone Alessio 
Published: February 2023

Abstract
Phonon softening is a ubiquitous phenomenon in condensed matter systems which is often associated with charge density wave (CDW) instabilities and anharmonicity. The interplay between phonon softening, CDW and superconductivity is a topic of intense debate. In this work, the effects of anomalous soft phonon instabilities on superconductivity are studied based on a recently developed theoretical framework that accounts for phonon damping and softening within the Migdal–Eliashberg theory. Model calculations show that the phonon softening in the form of a sharp dip in the phonon dispersion relation, either acoustic or optical (including the case of Kohn-type anomalies typically associated with CDW), can cause a manifold increase of the electron–phonon coupling constant λ. This, under certain conditions, which are consistent with the concept of optimal frequency introduced by Bergmann and Rainer, can produce a large increase of the superconducting transition temperature

T

c

. In summary, our results suggest the possibility of reaching high-temperature superconductivity by exploiting soft phonon anomalies restricted in momentum space.
Emergence of Rashba-/Dresselhaus effects in Ruddlesden–Popper halide perovskites with octahedral rotations
Authors: Krach Sonja , Forero-Correa Nicolás , Biega Raisa-Ioana , Reyes-Lillo Sebastian E , Leppert Linn 
Published: February 2023

Abstract
Ruddlesden–Popper halide perovskites are highly versatile quasi-two-dimensional energy materials with a wide range of tunable optoelectronic properties. Here we use the all-inorganic Cs

n
+
1

Pb
n
X

3
n
+
1

Ruddlesden–Popper perovskites with X = I, Br, and Cl to systematically model the effect of octahedral tilting distortions on the energy landscape, band gaps, macroscopic polarization, and the emergence of Rashba-/Dresselhaus splitting in these materials. We construct all unique n = 1 and n = 2 structures following from octahedral tilts and use first-principles density functional theory to calculate total energies, polarizations and band structures, backed up by band gap calculations using the GW approach. Our results provide design rules for tailoring structural distortions and band-structure properties in all-inorganic Ruddlesden–Popper perovskites through the interplay of the amplitude, direction, and chemical character of the antiferrodistortive distortion modes contributing to each octahedral tilt pattern. Our work emphasizes that, in contrast to three-dimensional perovskites, polar structures may arise from a combination of octahedral tilts, and Rashba-/Dresselhaus splitting in this class of materials is determined by the direction and Pb-I orbital contribution of the polar distortion mode.
Harvesting microwave energy using pyroelectricity of nanostructured graphene/zirconium-doped hafnium oxide ferroelectric heterostructures
Authors: Dragoman Mircea , Aldrigo Martino , Dinescu Adrian , Vasilache Dan , Iordanescu Sergiu , Dragoman Daniela , Laudadio Emiliano , Pavoni Eleonora 
Published: February 2023

Abstract
In this work, we present the design, atomistic/circuit/electromagnetic simulations, and the experimental results for graphene monolayer/zirconium-doped hafnium oxide (HfZrO) ultra-thin ferroelectric-based field effect transistors fabricated at the wafer scale, regarding the pyroelectricity generation directly from microwave signals, at room temperature and below it, namely at 218 K and at 100 K. The transistors work like energy harvesters, i.e. they collect low-power microwave energy and transform it into DC voltages with a maximum amplitude between 20 and 30 mV. The same devices function as microwave detectors in the band 1–10.4 GHz and at very low input power levels not exceeding 80 μW when they are biased by using a drain voltage, with average responsivity values in the range 200–400 mV mW−1.
Highly efficient and stable near-infrared photodetectors enabled from passivated tin–lead hybrid perovskites
Authors: Zhao Ru , Huang Junyi , Liu Meiyue , Tan Furui , Zhang Putao , Chen Zeng , Yao Xiang , Li Shengjun 
Published: February 2023

AbstractTin–lead perovskite-based photodetectors have a wide light-absorption wavelength range, which spans 1000 nm. However, the preparation of the mixed tin–lead perovskite films faces two great obstacles, namely easy oxidation of Sn2+to Sn4+and fast crystallization from tin–lead perovskite precursor solutions, thus further resulting in poor morphology and high density of defects in tin–lead perovskite films. In this study, we demonstrated a high-performance of near-infrared photodetectors prepared from a stable low-bandgap (MAPbI3)0.5(FASnI3)0.5film modified with 2-fluorophenethylammonium iodide (2-F-PEAI). The addition engineering can efficiently improve the crystallization of (MAPbI3)0.5(FASnI3)0.5films through the coordination binding between Pb2+and N atom in 2-F-PEAI, and resulting in a uniform and dense (MAPbI3)0.5(FASnI3)0.5film. Moreover, 2-F-PEAI suppressed Sn2+oxidation and effectively passivated defects in the (MAPbI3)0.5(FASnI3)0.5film, thereby significantly reducing the dark current in the PDs. Consequently, the near-infrared photodetectors showed a high responsivity with a specific detectivity of over 1012Jones at 800 to near-1000 nm. Additionally, the stability of PDs incorporated with 2-F-PEAI has been significantly improved under air conditions, and the device with the 2-F-PEAI ratio of 400:1 retained 80% of its initial efficiency after 450 h storage in air without encapsulation. Finally, 5 × 5 cm2photodetector arrays were fabricated to demonstrate the potential utility of the Sn–Pb perovskite photodetector in optical imaging and optoelectronic applications.
Fabrication of sandwich structures of Ag/analyte/MoO3 sea urchins for SERS detection of methylene blue dye molecules
Authors: B Ramya Prabhu , Varier Meenakshi M , John Neena S 
Published: February 2023

Abstract
A substrate for surface-enhanced Raman spectroscopy (SERS) in a sandwich configuration, noble metal/analyte/defect-rich metal oxide, is demonstrated for the detection of methylene blue(MB). The sandwich structure (Ag/MB/SUMoO3) is fabricated by physical vapour deposition of Ag nanoparticles over the MB analytes that are adsorbed on sea urchin MoO3 (SUMoO3). SUMoO3 are grown on a glass substrate by chemical bath deposition. The morphology of the fabricated sandwich structures shows serrated spikes of MoO3 from the core region decorated with strings of silver nanoparticles. The silver-decoration and the oxygen defects of SUMoO3 promote absorption in the visible region and facilitate charge transfer between MB and SUMoO3, which are beneficial for achieving superior SERS properties in this configuration compared to the contribution from individual components alone. The sandwich structure is able to detect the MB molecule up to 100 nM with an enhancement factor of 8.1 × 106. The relative standard deviation of SERS intensity for the 1618 cm−1 peak of MB across the substrate is 29.2%. The configuration offers stability to SERS substrate under ambient conditions. The combined effect of charge transfer, surface plasmon resonance, and MB resonance results in the improved SERS detection of MB molecules with the Ag/MB/SUMoO3 sandwich structure.
On variable stiffness of flexible parallel electroadhesive structures
Authors: Yuan Yingze , Li Fengfeng , Guo Jianglong , Liu Liwu , Liu Yanju , Leng Jinsong 
Published: February 2023

Abstract
Electrostatic layer jamming represents a lightweight, low energy consumption, electrically tunable, and cost-effective variable stiffness structure. Flexible parallel electroadhesive structures are the simplest form of electrostatic layer jamming. There is a lack of comprehensive and experimentally validated theoretical variable stiffness models of flexible parallel electroadhesive structures. Here we present the first variable stiffness model of flexible parallel electroadhesive structures under three-point bending, cantilever beam bending subjected to tip concentrated forces, and cantilever beam bending subjected to uniformly distributed forces, using the Euler–Bernoulli beam theory and considering friction and slip between layers by integrating the Maxwell stress tensor into the model. We find that: (1) three-point bending and cantilever beam bending under tip concentrated forces only have pre-slip and full-slip, whereas cantilever beam bending under uniformly distributed forces has an additional partial-slip which can be used for stiffness modulation; (2) the stiffness during the pre-slip stage is four times larger than the stiffness in the full-slip stage; and (3) increasing the voltage, dielectric permittivity, and coefficient of friction can elongate the pre-slip stage, thus enhancing the structural load capability. A customized three-point bending and a cantilever beam bending experimental setup were developed and the experimental deflection–force curve agreed relatively well with the theoretical one. The model, which considered electrode thickness and Young’s modulus, and the results presented in this work are useful insights for understanding the variable stiffness mechanism of electroadhesive layer jamming and are helpful for their structural optimization towards practical applications.
A parasitic-inertia piezoelectric actuator with isosceles trapezoidal flexible mechanism base on parasitic motion exploration and asymmetrical installation
Authors: Gao Jingwen , Chen Weizheng , Dong Chenxu , Tian Hailong , Li Jianping 
Published: February 2023

Abstract
Parasitic-inertia piezoelectric actuators have been widely studied for their ability to achieve both high positioning accuracy and large working strokes. However, backward motion results in parasitic-inertia piezoelectric actuators with the disadvantages of low efficiency and abrasion of driving foot. In this study, a parasitic-inertia piezoelectric actuator with an isosceles trapezoidal flexible mechanism is diegned and optimized to reduce backward motion considering the influence of parasitic motion proportion. It applies the asymmetrical installation of the piezoelectric stack to increase parasitic motion hence the reducing of backward motion. This study discusses the structure and working process of piezoelectric actuators and optimizes the design of flexible mechanism structure parameters with matrix displacement method and finite element method. A prototype of an parasitic-inertia piezoelectric actuator was manufactured, and a series of experiments were conducted. From the experiment, the piezoelectric actuator obtained a minimum backward motion percentage α = 18.36% and forward motion time percentage β = 95.9% at the frequency f = 1 Hz and the voltage U = 80 V. At U = 120 V, f = 500 Hz, the maximum motion speed of the actuator is 916 μm s−1; At U = 20 V and f = 1 Hz, the minimum positioning resolution of the actuator is 0.69 μm. At U = 120 V, f = 1 Hz, the maximum vertical load force is 1600 g, and the maximum parallel load force is 50 g. It has shown that the proposed isosceles trapezoidal flexible mechanism is feasible and can significantly reduce backward motion at the appropriate voltage. The mentioned characteristics of isosceles trapezoidal flexible mechanism can significantly alleviate the abrasion of driving foot, improve working efficiency. Also, it is vital for the miniaturization and practical application of parasitic-inertia piezoelectric actuators.
Spontaneous change of symmetry in a magnetoactive elastomer beam at its critical bending induced by a magnetic field
Authors: Kalita V M , Dzhezherya Yu I , Cherepov S V , Skirta Yu B , Bodnaruk A V , Ryabchenko S M 
Published: February 2023

Abstract
The features of the critical bending deformation and magnetization of a magnetoactive elastomer (MAE) beam with a fixed end in a transverse uniform magnetic field have been studied. After the beam reaches a critical bending, the symmetry of the beam shape and the symmetry of the MAE magnetic state change spontaneously. At the critical point, a continuous transition from the highly symmetric magnetic state in the unbent MAE beam to the low symmetric magnetic state in the bent MAE beam (this is the angular state with the effective magnetization inclined to the field) takes place. The beam bending occurs due to the gain in the magnetic energy of the beam. The formation of an angular magnetic state in it has a magnetoelastic origin and is characterized by the critical behavior of the mutually related bending and longitudinal effective magnetization of the MAE, but it is the magnetization that plays the role of order parameter. Furthermore, there is no longitudinal magnetization in the absence of bending and, vice versa, there is no bending in the absence of longitudinal magnetization. The influence of a low remanent magnetization, which eliminates the uncertainty in the bending direction, on the critical bending has been analyzed. The role of the magnetorheological effect, which affects the critical field magnitude and leads to the appearance of field-induced bending hysteresis near the critical point, has also been elucidated.
Calculation and measurement of coupling loss in a no-insulation ReBCO racetrack coil exposed to AC magnetic field
Authors: Otten Simon , ter Harmsel Jeroen , Dhallé Marc , Ten Kate Herman 
Published: February 2023

Abstract
No-insulation coils are self-protecting and can therefore generally be operated at higher current densities. However, the electrical turn-to-turn connections may cause additional AC loss when charging the coil or when it is exposed to a time-dependent magnetic field. In this work, we study the case of a no-insulation ReBCO tape racetrack coil exposed to a uniform AC field applied parallel to the tape surface. We show that an anisotropic continuum model allows to formulate analytical approximations for coupling loss in the low- and high-frequency limits. For intermediate frequencies, the continuum model needs to be evaluated numerically. The model was validated with representative measurements of AC loss in the coils, measured calorimetrically as well as magnetically using pick-up coils. The validation experiment confirms the predicted frequency dependence of the coupling loss, which is

P
∝

f
2

at low frequencies and

P
∝

f

at high frequencies, due to the skin effect. The transition between low- and high-frequency regimes occurs around a characteristic frequency

f

c

that is directly related to the characteristic time constant

τ
=
1

/

2
π

f

c

associated with the current decay in (dis)charge experiments.
Magnetized homann flow comprising GO and Co3O4 nanoparticles past a biaxially stretching surface
Authors: Sarfraz Mahnoor , Khan Masood 
Published: February 2023

Abstract
The usage of hybrid nanofluid due to their outstanding thermal conductivity has become a fascinating topic in research. This study considers the suspension of graphene oxide and cobalt oxide in ethylene glycol on a biaxially, planarly, and perpendicularly stretching surface. The influence of heat Cattaneo-Christov double diffusion with generation/absorption, Joule heating, and shapes of nanoparticles is scrutinized. The similarity conversions are assumed, which determine dimensionless ordinary equations. The collocation method, bvp4c routine is utilized to determine the numerical and asymptotic behavior of the problem. Because of better thermal and electrical conductivity of nanoparticles under consideration, this research can be used for energy storage, electronics, catalytic supports, and cooling of a system. The thermophysical properties are scrutinized via the Hamilton-Crosser model of nanofluids, which is significant as it provides a quantitative understanding of the heat transfer behavior of nanofluids, enabling the design and optimization of nanofluid-based heat transfer systems. Due to the magnetic field, temperature distribution is increased; however, velocities diminish. Moreover, energy transport is maximum for spherical-shaped nanoparticles, while it is lowest for blade-shaped nanoparticles. By incrementing volume fraction, the intermolecular motion amongst the particles becomes disorderly and erratic, which enhances the flow and thermal transport. The wall stress parameter along the x-axis is augmented due to an increment in the stretching parameter, while the opposite trend is seen for the wall stress parameter along the y-axis.
Edge turbulence transport during ELM suppression with n = 4 resonant magnetic perturbation on EAST
Authors: Liu S.C. , Liang Y. , Li L.T. , Tang T.F. , Wu X.H. , Yan N. , Shi T.H. , Li G.S. , Ye K.X. , Meng L.Y. , Ding R. , Sun Y. , Jia M. , Ma Q. , Zang Q. , Li X. , Wang S.X. , Wang M.R. , Zhao H.L. , Wei J.L. , Zhang T. , Jin Y.F. , Liao L. , Wei W.Y. , Li Y. , Chen R. , Hu G.H. , Zhao N. , Liu X.J. , Ming T.F. , Han X. , Zhang W.B. , Wang L. , Qian J.P. , Zeng L. , Li G.Q. , Xu G.S. , Gong X.Z. , Gao X. 
Published: February 2023

Abstract
The edge turbulence characteristics and the induced radial transport have been investigated in edge localized mode (ELM) suppression by using the

n
=

4 resonant magnetic perturbation coils on EAST, with

q

95

=

3.6 and the electron collisionality

ν

e

∗

≈

0.5. During ELM suppression, the edge turbulence is enhanced dramatically, as measured by the reciprocating probe and the poloidal correlation reflectometry. In the near SOL, the low frequency turbulence (<30 kHz) has a large fluctuation level and propagates along the ion diamagnetic drift direction with a speed of 0.35 km s−1 in the plasma frame; an

n
=
1

electromagnetic mode around 120 kHz with a small

k

θ

(∼0.15 cm−1) appears when the ELM is suppressed; weak broadband turbulence between 40–120 kHz propagates in the electron diamagnetic drift direction with a velocity of 3.4 km s−1 in the plasma frame. During the ELM suppression, the radial turbulent particle flux, calculated in both the time and frequency domains, is much higher (can be up to five times) than that in the inter-ELM phase. Furthermore, the low frequency turbulence (<30 kHz) dominates the cross-field particle transport. The 120 kHz electromagnetic mode also contributes to outward particle flux, which is relatively small. A set of CGYRO simulations are performed to illustrate the nature of the 120 kHz electromagnetic mode and the low frequency turbulence, suggesting that the former is the micro-tearing mode and the latter is the ion temperature gradient mode. The bispectral analysis suggests a strong three-wave coupling between the low frequency and high frequency turbulence (>250 kHz), which could be beneficial to form the observed turbulent transport. The estimated upstream cross-field particle flux is consistent with the total particle flux deposited on divertor targets, demonstrating that the enhanced radial turbulent particle transport is an important mechanism for particle exhaust in ELM suppression.
Accounting for spatial economic interactions at local and meso scales in integrated assessment model (IAM) frameworks: challenges and recent progress
Authors: Cultice Brian , Irwin Elena , Jones Mackenzie 
Published: February 2023

Abstract
The scientific and policy needs to assess and manage climate change impacts have spawned new coupled, multi-scale integrated assessment model (IAM) frameworks that link global climate and economic processes with high-resolution data and models of human-environmental systems at local and meso scales (Fisher-Vanden and Weyant 2020 Annu. Rev. Resour. Econ.
12 471–87). A central challenge is in accounting for the fundamental interdependence of people, firms, and economic activities across space at multiple scales. This requires modeling approaches that can incorporate the relevant spatial details at each scale while also ensure consistency with spatially varying feedbacks and interactions across scales—a condition economists refer to as spatial equilibrium. In this paper, we provide an overview of how economists think about and model spatial interactions, particularly those at the local level. We describe challenges and recent progress in accounting for greater spatial heterogeneity at individual (field, agent) scales and incorporating heterogeneous spatial interactions and dynamics into consistent IAM frameworks. We conclude that the most notable progress is in advancing global IAMs with spatial heterogeneity and dynamics embedded in spatial equilibrium frameworks and that less progress has been made in incorporating features of spatial equilibrium into highly detailed multi-scale IAMs.
Quantifying factory-scale CO2/CH4 emission based on mobile measurements and EMISSION-PARTITION model: cases in China
Authors: Shi Tianqi , Han Ge , Ma Xin , Mao Huiqin , Chen Cuihong , Han Zeyu , Pei Zhipeng , Zhang Haowei , Li Siwei , Gong Wei 
Published: February 2023

Abstract
Development of the measurement-based carbon accounting means is of great importance to supplement the traditional inventory compilation. Mobile CO2/CH4 measurement provides a flexible way to inspect plant-scale CO2/CH4 emissions without the need to notify factories. In 2021, our team used a vehicle-based monitor system to conduct field campaigns in two cities and one industrial park in China, totaling 1143 km. Furthermore, we designed a model based on sample concentrations to evaluate CO2/CH4 emissions, EMISSION-PARTITION, which can be used to determine global optimal emission intensity and related dispersion parameters via intelligent algorithm (particle swarm optimization) and interior point penalty function. We evaluated the performance of EMISSION-PARTITION in chemical, coal washing, and waste incineration plants. The correlations between measured samples and rebuilt simulated ones were larger than 0.76, and RMSE was less than 11.7 mg m−3, even with much fewer samples (25). This study demonstrated the wide applications of a vehicle-based monitoring system in detecting greenhouse gas emission sources.