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Metasurface electron optics in graphene [article]

Ruihuang Zhao, Pengcheng Wan, Ling Zhou, Di Huang, Haiqin Guo, Hao Xia, Junjie Du
2022 arXiv   pre-print
For electron optics in graphene, the propagation effect has so far been the only physical mechanism available. The resulting electron-optics-based components are large in size and operate at low temperatures to avoid violating the ballistic transport limits. In this paper, Dirac fermion metasurfaces, electronic counterparts of optical metasurfaces, are introduced for graphene electronics. By a metasurface, formally a linear array of gate-bias-controlled circular quantum dots, the wavefront of
more » ... ectron beams can be shaped within a one-quantum-dot-diameter distance, far below the ballistic limits at room temperature. This provides opportunities to create electron-optics-based devices that operate under ambient conditions. Moreover, unlike optical metasurfaces, Dirac fermion metasurfaces have near-perfect operating efficiencies and their high tunability allows for free and fast switching among functionalities. The concept of metasurface electron optics might open up a promising avenue for improving the performance of quantum devices in Dirac fermion materials.
arXiv:2201.02415v2 fatcat:ebeyddcagfhkxhhmixfgpt4yzi

An Improved Atmospheric Component of Zebiak-Cane Model for Simulating ENSO Winds

Ruihuang XIE, Fei-Fei JIN, Fei HUANG
2015 Journal of the Meteorological Society of Japan  
The atmospheric component of the Zebiak-Cane (ZC) coupled model is a simple elegant framework that plays an instrumental role in the investigation of the fundamental coupled dynamics of the tropical ocean-atmosphere interaction and the El Niño/Southern Oscillation (ENSO) phenomenon. We attempt two simple thermal and dynamical modifications to reduce apparently spurious wind activities simulated by this atmospheric model in the eastern tropical Pacific under ENSO sea surface temperature (SST)
more » ... maly forcing. First, motivated by established observational evidences, we manipulate the anomalous convective heating to be dependent on the sum of mean SST and SST anomalies and the low-level convergence. Second, we add an ad hoc parameterization for the effect of convective momentum transport (CMT) into the zonal momentum balance. By adding a background-dependent efficiency factor into convective heating and further adjusting the convective feedback parameter used in the original model, we are able to substantially reduce the wind bias in the tropical Pacific, especially in the eastern tropical Pacific. Meanwhile, with a simple CMT parameterization, it compensates an over reduction in the central Pacific wind due to the first modification. By comparing the simulated wind anomalies in our modified version with that from the original version and with the observation, we find that the equatorial wind response to observation SST anomaly forcing for the period 1982-2010 has been improved in terms of amplitudes and spatial patterns. We also show that these improvements are carried over to ZC coupled model as well when we add these modifications to coupled simulations.
doi:10.2151/jmsj.2015-033 fatcat:xcxzd4kejzeqpdazm3wsmcvqpq

Propagation properties of right-hand circularly polarized Airy–Gaussian beams through slabs of right-handed materials and left-handed materials

Jiayao Huang, Zijie Liang, Fu Deng, Weihao Yu, Ruihuang Zhao, Bo Chen, Xiangbo Yang, Dongmei Deng
2015 Optical Society of America. Journal A: Optics, Image Science, and Vision  
The propagation of right-hand circularly polarized Airy-Gaussian beams (RHCPAiGBs) through slabs of righthanded materials (RHMs) and left-handed materials (LHMs) is investigated analytically and numerically with the transfer matrix method. An approximate analytical expression for the RHCPAiGBs passing through a paraxial ABCD optical system is derived on the basis of the Huygens diffraction integral formula. The intensity and the phase distributions of the RHCPAiGBs through RHMs and LHMs are
more » ... nstrated. The influence of the parameter χ 0 on the propagation of RHCPAiGBs through RHM and LHM slabs is investigated. The RHCPAiGBs possess transverse-momentum currents, which shows that the physics underlying this intriguing accelerating effect is that of the combined contributions of the transverse spin and transverse orbital currents. Additionally, we go a step further to explore the radiation force including the gradient force and scattering force of the RHCPAiGBs.
doi:10.1364/josaa.32.002104 pmid:26560925 fatcat:nqtkhqadwjaopppfs5lkvaqqnq

The impact of a Dysbindin schizophrenia susceptibility variant on fiber tract integrity in healthy individuals: A TBSS-based diffusion tensor imaging study

Thomas Nickl-Jockschat, Tony Stöcker, Valentin Markov, Axel Krug, Ruihuang Huang, Frank Schneider, Ute Habel, Klaus Zerres, Markus M. Nöthen, Jens Treutlein, Marcella Rietschel, N. Jon Shah (+1 others)
2012 NeuroImage  
Schizophrenia is a severe neuropsychiatric disorder with high heritability, though its exact etiopathogenesis is yet unknown. An increasing number of studies point to the importance of white matter anomalies in the pathophysiology of schizophrenia. While several studies have identified the impact of schizophrenia susceptibility gene variants on gray matter anatomy in both schizophrenia patients and healthy risk variant carriers, studies dealing with the impact of these gene variants on white
more » ... ter integrity are still scarce. We here present a study on the effects of a Dysbindin schizophrenia susceptibility gene variant on fiber tract integrity in healthy young subjects. 101 subjects genotyped for Dysbindin-gene variant rs1018381, though without personal or first degree relative history of psychiatric disorders underwent diffusion tensor imaging (DTI), 83 of them were included in the final analysis. We used Tract-Based Spatial Statistics (TBSS) analysis to delineate the major fiber tracts. Carriers of the minor allele T of the rs1018381 in the Dysbindin gene showed two clusters of reduced fractional anisotropy (FA) values in the perihippocampal region of the right temporal lobe compared to homozygote carriers of the major allele C. Clusters of increased FA values in T-allele carriers were found in the left prefrontal white matter, the right fornix, the right midbrain area, the left callosal body, the left cerebellum and in proximity of the right superior medial gyrus. Dysbindin has been implicated in neurite outgrowth and morphology. Impairments in anatomic connectivity as found associated with the minor Dysbindin allele in our study may result in increased risk for schizophrenia due to altered fiber tracts.
doi:10.1016/j.neuroimage.2011.10.012 pmid:22019876 fatcat:mkx7sgpyczgbhje6w7xwmxxv3m

Graphene Electron Metasurfaces [article]

Ruihuang Zhao, Pengcheng Wan, Ling Zhou, Di Huang, Haiqin Guo, Hao Xia, Junjie Du
2022
The propagation effect is so far the only available implementation mechanism when electronic components in graphene are developed based on Dirac fermion optics. The resulting optics-inspired components are large in size and operate normally only in the lowest possible temperature environment so that the ballistic limits are not violated. Here electron metasurfaces based on the generalized Snell's law, a linear array of gate-bias-controlled circular quantum dots in form, are proposed to
more » ... e graphene electrons within the distance of the quantum-dot diameter, far less than the ballistic limits at room temperature. This provides opportunities to create untracompact optics-inspired components which are comparable in size to components arising from other principles and hence can operate at any temperature below room temperature. Moreover, unlike their optical counterparts, electron metasurfaces have near-perfect operation efficiencies and their high tunability allows for free and fast switching among functionalities. The conceptually new metasurfaces open up a promising avenue to pull optics-inspired components to a desired level of performance and flexibility.
doi:10.48550/arxiv.2201.02415 fatcat:ia4iwqohifbnjgvqgmnk2cyvvq

Meet Our Authors

2015 MRS bulletin  
Rui Huang The University of Texas at Austin, USA; and email ruihuang@mail.utexas.edu .  ...  Huang is a professor of aerospace engineering and engineering mechanics and holds the endowed position of the Pearlie Dashiell Henderson Centennial Fellowship in Engineering at The University of Texas  ... 
doi:10.1557/mrs.2015.10 fatcat:vdtmwdxwbvg43i3tq47tjwfhe4

Show of adhesive strength

Rui Huang
2011 Nature Nanotechnology  
Fang Qian and Yat Li ❐ Rui Huang is in the Department of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin, Austin, Texas 78712, USA. e-mail: ruihuang@mail.utexas.edu  ...  Rui Huang news & views in the blister test with a constant number of molecules, which allows the radius of the blister (which is increasing) and the internal pressure (which is decreasing) to be measured  ... 
doi:10.1038/nnano.2011.150 pmid:21897383 fatcat:5wx7ofibcvcjdhwxyryf2coeam

Adaptive compensation for time-varying uncertainties in model-based control of lower-limb exoskeleton systems

Guangkui Song, Rui Huang, Hong Cheng, Jing Qiu, Shuai Fan
2020 Science China Information Sciences  
Citation Song G K, Huang R, Cheng H, et al. Adaptive compensation for time-varying uncertainties in modelbased control of lower-limb exoskeleton systems.  ...  * Corresponding author (email: ruihuang@uestc.edu.cn)Song G K, et al.  ... 
doi:10.1007/s11432-019-2754-9 fatcat:isaotprrdredzaysbhv65kpxoi

Electrically induced surface instability of a conductive thin film on a dielectric substrate

Rui Huang
2005 Applied Physics Letters  
2 at ␦ =1/3, similar to the pull-in instability in elastically suspended parallel-plate electrostatic actuators. 16 However, this is unphysical in the present system because the a͒ Electronic mail: ruihuang  ... 
doi:10.1063/1.2099526 fatcat:z7q7xtonajc5re3ousw2cbdtnm

Published papers about fingerprint and quality control of traditional Chinese medicine

2011 Journal of Pharmaceutical Analysis  
First author: Liu Donghui Email: Idh2v006@yahoo.com.cn Lii Ruihuang, Xu Jianguo*, Xu Fang, Liu Yating, Zhao Jun, Tan Wei.  ...  First author: Huang Yanping Email: hypgz@126.com Yin Xiaoying, Luo Yongming, Hu Yuzhu.  ... 
doi:10.1016/s2095-1779(11)70025-9 fatcat:psvj7njhozbqtgnndgyb3p3sgm

Effect of Surface Properties on Wrinkling of Ultrathin Films

Rui Huang, Christopher M. Stafford, Bryan D. Vogt
2007 Journal of Aerospace Engineering  
E-mail: ruihuang@mail.utexas.edu 2 Staff Scientist, Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899. 3 Assistant Professor, Dept. of Chemical Engineering, Arizona  ...  It was found that, for such cases, it is the surface stress that is relevant for the stability of the film ͑Huang and Suo 2003͒.  ... 
doi:10.1061/(asce)0893-1321(2007)20:1(38) fatcat:ohlw22sj6fcbvjirpzainuoue4

Very thin solid-on-liquid structures: the interplay of flexural rigidity, membrane force, and interfacial force

R Huang, Z Suo
2003 Thin Solid Films  
E-mail address: ruihuang@mail.utexas.edu (R. Huang). SOL structure. The structure can be fabricated by wafer bonding or by deposition.  ...  Following Huang and Suo w25x, we write wsq sin(kx), 1 usq cos(kx), (7) where q and q are the amplitudes of the perturbation, 1 2 and k is the wavenumber.  ... 
doi:10.1016/s0040-6090(03)00065-8 fatcat:ynyiou3eybb5rmsbcfja7vf26i

Study of Stresses and Plasticity in Through-Silicon Via Structures for 3D Interconnects by X-Ray Micro-Beam Diffraction

2014 IEEE transactions on device and materials reliability  
Huang are with the Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, TX 78712 USA (e-mail: ruihuang@mail.utexas.edu).  ... 
doi:10.1109/tdmr.2014.2310705 fatcat:wzt3azqwozaxnavynbik6yz4pm

Torsional vibrations of circular elastic plates with thickness steps

M.K. Kang, Rui Huang, T. Knowles
2006 IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control  
Huang are with the Research Center for Mechanics of Solids, Structures and Materials, Department of Aerospace Engineering and Engineering Mechanics, The University of Texas, Austin, TX 78712 (e-mail: ruihuang  ...  Rui Huang received his B.S. degree in Theoretical and Applied Mechanics from the University of Science and Technology of China in 1994 and his Ph.D. degree in Civil and Environmental Engineering, with  ... 
doi:10.1109/tuffc.2006.1593373 fatcat:h2p5qu7fhzawlncqkvy433jrhe

Wrinkling of a compressed elastic film on a viscous layer

R. Huang, Z. Suo
2002 Journal of Applied Physics  
Huang and Z. Suo  ...  differential equations. 13, 14 In the lubrication theory, the Navier-Stokes equations for incompressible viscous flow reduce to a͒ Author to whom correspondence should be addressed; electronic mail: ruihuang  ... 
doi:10.1063/1.1427407 fatcat:ityiagcnsbgvnhpuptsb2wgaum
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