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Magnetic Moment Tensor Potentials for collinear spin-polarized materials reproduce different magnetic states of bcc Fe

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npj Computational Materials 2022年第1期8卷 107-112页

作者： Ivan Novikov Blazej Grabowski Fritz Körmann Alexander Shapeev Skolkovo Institute of Science and Technology Skolkovo Innovation CenterNobel St.3Moscow143026Russia Institute for Materials Science University of StuttgartPfaffenwaldring 5570569StuttgartGermany Computational Materials Design Max-Planck-Institut für Eisenforschung GmbHD-40237DüsseldorfGermany Materials Science and Engineering Delft University of Technology2628 CDDelftThe Netherlands

We present the magnetic Moment Tensor Potentials(mMTPs),a class of machine-learning interatomic potentials,accurately reproducing both vibrational and magnetic degrees of freedom as provided,e.g.,from first-principles calculations.The accuracy is achieved by a two-step minimization scheme that coarse-grains the atomic and the spin space.The performance of the mMTPs is demonstrated for the prototype magnetic system bcc iron,with applications to phonon calculations for different magnetic states,and molecular-dynamics simulations with fluctuating magnetic moments.

关键词： magnetic fluctuating states

Riding on bifurcating Berry curvatures into reentrant quantum anomalous Hall states

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Science China(Physics,Mechanics & Astronomy) 2022年第4期65卷 125-126页

作者： Zhenyu Zhang International Center for Quantum Design of Functional Materials(ICQD) Hefei National Laboratory for Physical Sciences at MicroscaleUniversity of Science and Technology of ChinaHefei 230026China

When a sufficiently strong magnetic field is applied to a twodimensional electron gas,it will drive the electrons into quantized states,known as the Landau levels.The transport properties of such a system are best manifested by the emergence of the(integer)quantum Hall effect(QHE)[1],characterizing the system as a quantum Hall insulator,a close and proceeding analog of the quantum spin Hall insulator.

关键词： quantum system states

Meta-optics and bound states in the continuum

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Science Bulletin 2019年第12期64卷 836-842页

作者： Kirill Koshelev Andrey Bogdanov Yuri Kivshar Nonlinear Physics Centre Australian National UniversityCanberra ACT 2601Australia ITMO University St. Petersburg 197101Russia

We discuss the recent advances in meta-optics and nanophotonics associated with the physics of bound states in the continuum(BICs). Such resonant states appear due to a strong coupling between leaky modes in optical guiding structures being supported by subwavelength high-index dielectric Mieresonant nanoantennas or all-dielectric metasurfaces. First, we review briefly very recent developments in the BIC physics in application to isolated subwavelength particles. We pay a special attention to novel opportunities for nonlinear nanophotonics due to the large field enhancement inside the particle volume creating the resonant states with high-quality(high-Q) factors, the so-called quasi-BIC, that can be supported by the subwavelength particles. Second, we discuss novel applications of the BIC physics to alldielectric optical metasurfaces with broken-symmetry meta-atoms when tuning to the BIC conditions allows to enhance substantially the Q factor of the flat-optics dielectric structures. We also present the original results on nonlinear high-Q metasurfaces and predict that the frequency conversion efficiency can be boosted dramatically by smart engineering of the asymmetry parameter of dielectric metasurfaces in the vicinity of the quasi-BIC regime.

关键词： Bound states in the continuum Meta-optics Second-harmonic generation Nanoresonator Metasurfaces

Acupuncture price in forty-one metropolitan regions in the United states: An out-of-pocket cost analysis based on Ok ***

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Journal of Integrative Medicine 2019年第5期17卷 315-320页

作者： Arthur Yin Fan David Dehui Wang Hui Ouyang Haihe Tian Hui Wei Deguang He Changzhen Gong Jipu Wen Ming Jin Chong He Sarah Faggert Alemi Sudaba Rahimi Acupuncture Profession Survey Project American Traditional Chinese Medicine AssociationViennaVA 22182USA Tongrentang Ming Qi Clinic New YorkNY 10016USA Oriental Asclepius LLCPlantationFL 33317USA Eastern Roots Wellness PLCMcLeanVA 22101USA McLean Center for Complementary and Alternative Medicine PIC.ViennaVA 22182USA Ohio State Integrative Medicine Wexner Medical CenterOhio State UniversityColumbusOH 43221USA YIN & YANG Healthcare FriendswoodTX 77546USA Chinese Acupuncture and Herbs Center LargoFI 33778USA Wei's Chinese Medical Center Lake WorthFL 33467USA New England School of Acupuncture NewtonMA 02458USA American Academy of Acupuncture Oriental Medicine RosevilleMN 55113USA TCMzone TempeAZ 85281USA

Few studies have focused on the cost of acupuncture treatments although acupuncture has become popular in the United states(U.S.). The purpose of the current study was to examine the out-of-pocket costs incurred from acupuncture services based on an online website, Ok ***. We examined descriptive statistics(range, median and 20% intervals) for the cost of acupuncture "first-time visits"and "follow-up visits" in 41 metropolitan regions in the U.S. The acupuncture prices of 723 clinics throughout 39 metropolitan regions were included, except for Birmingham, Alabama and Detroit, Michigan as there was no online data available at the time of the study for these two regions. The cost range for a first-time acupuncture visit was $15–400;the highest median was $150 in Charleston, South Carolina,while the lowest was $45 in St. Louis, Missouri. The top 10 cities for the highest median were:Baltimore, Washington, D.C., New York, San Francisco, San Jose, Boston, Atlanta, Seattle, Portland and Indianapolis, with the median $120, while the median for all 723 clinics was $112. For the follow-up visits,the cost range was $15–300;the highest median was $108 in Charleston, South Carolina, and the lowest$40 in Miami, Florida. The 10 cities with highest median follow-up acupuncture visit costs were: New York, Baltimore, New Orleans, Washington, D.C., Philadelphia, San Francisco, San Jose, Seattle, Boston and Atlanta, with the median $85, while for all 723 clinics the median price was $80. The estimation of the average gross annual income of each acupuncturist from the regions studied was $95,760, while the total annual cost of patients seeking acupuncture services in the U.S. was about $3.5 billion in 2018.

关键词： Acupuncture Price Out-of-pocket cost Annual cost City, United states

A novel kind of multiple steady states characteristics in the dividing wall column

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Chinese Journal of Chemical Engineering 2019年第4期27卷 869-876页

作者： Erwei Song Zengxi Li Erqiang Wang School of Chemical Sciences University of Chinese Academy of Sciences

In this article, one kind of multiple steady states(MSS) phenomenon was investigated for a dividing wall column(DWC). The four-section model constructed in Aspen Plus was employed to simulate two DWC cases: mixture of n-hexane, n-heptane and n-octane;system of methanol, ethanol and n-propanol. It can be seen that there is a range of vapor split ratio in which multiple solutions of reflux ratio exist for fixed DWC configuration with the same feed and product streams. The width and the curve shapes of the MSS region, and the number of solutions change with the liquid split ratio. This MSS phenomenon was further explained using the component recovery around the prefractionator and the component recycling flow inside the DWC. This MSS phenomenon is helpful for DWC design by knowing the probable existence of multiple solutions in advance.

关键词： Dividing wall column Multiple steady states Vapor split ratio Liquid split ratio Recycling flow

Efficient scheme for remote preparation of arbitrary n-qubit equatorial states

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Chinese Physics B 2020年第4期29卷 160-164页

作者：查新未王敏锐姜若虚 School of Science Xi'an University of Posts and TelecommunicationsXi'an 710121China

Recently,a scheme for deterministic remote preparation of arbitrary multi-qubit equatorial states was proposed by Wei et al.[Quantum Inf.Process.1770(2018)].It is worth mentioning that the construction of mutual orthogonal measurement basis plays a key role in quantum remote state preparation.In this paper,a simple and feasible remote preparation of arbitrary n-qubit equatorial states scheme is proposed.In our scheme,the success probability will reach unit.Moreover,there are no coefficient constraint and auxiliary qubits in this scheme.It means that the success probabilities are independent of the coefficients of the entangled channel.The advantage of our scheme is that the mutual orthogonal measurement basis is devised.To accomplish the quantum remote state preparation(RSP)schemes,some new sets of mutually orthogonal measurement basis are introduced.

关键词： mutual orthogonal measurement basis remote state preparation equatorial states success probability

A field-effect approach to directly profiling the localized states in monolayer MoS2

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Science Bulletin 2019年第15期64卷 1049-1055页

作者： Hao Wu Yuan Liu Zeyu Deng Hung-Chieh Cheng Dehui Li Jian Guo Qiyuan He Sen Yang Mengning Ding Yun-Chiao Huang Chen Wang Yu Huang Xiangfeng Duan Department of Materials Science and Engineering University of CaliforniaLos AngelesCA90095USA Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCA90095USA California NanoSystems Institute University of CaliforniaLos AngelesCA90095USA

A fundamental understanding of the charge transport mechanism in two-dimensional semiconductors(e.g., MoS2) is crucial for fully exploring their potential in electronic and optoelectronic devices. By using monolayer graphene as the barrier-free contact to MoS2, we show that the field-modulated conductivity can be used to probe the electronic structure of the localized states. A series of regularly distributed plateaus were observed in the gate-dependent transfer curves. Calculations based on the variable-range hopping theory indicate that such plateaus can be attributed to the discrete localized states near mobility edge. This method provides an effective approach to directly profiling the localized states in conduction channel with an ultrahigh resolution up to 1 meV.

关键词： Two-dimensional layered materials Field-effect transistor Localized states Electronic transport Conductivity plateau

Merging bound states in the continuum by harnessing higher-order topological charges

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Light(Science & Applications) 2022年第9期11卷 2098-2106页

作者： Meng Kang Li Mao Shunping Zhang Meng Xiao Hongxing Xu Che Ting Chan School of Physics and Technology and Key Laboratory of Artificial Micro-and Nano-structures of Ministry of EducationWuhan UniversityWuhan 430072China Department of Physics The Hong Kong University of Science and TechnologyHong KongChina Wuhan Institute of Quantum Technology Wuhan 430206China School of Microelectronics Wuhan UniversityWuhan 430072China

Bound states in the continuum(BICs)can confine light with a theoretically infinite Q factor.However,in practical on-chip resonators,scattering loss caused by inevitable fabrication imperfection leads to finite Q factors due to the coupling of BICs with nearby radiative states.Merging multiple BICs can improve the robustness of BICs against fabrication imperfection by improving the Q factors of nearby states over a broad wavevector range.To date,the studies of merging BICs have been limited to fundamental BICs with topological charges±1.Here we show the unique advantages of higher-order BICs(those with higher-order topological charges)in constructing merging BICs.Merging multiple BICs with a higher-order BIC can further improve the Q factors compared with those involving only fundamental BICs.In addition,higher-order BICs offer great flexibility in realizing steerable off-T merging BICs.A higher-order BIC at F can split into a few off-T fundamental BICs by reducing the system symmetry.The split BICs can then be tuned to merge with another BIC,e.g.,an accidental BIC,at an off-Γpoint.When the in-plane mirror symmetry is further broken,merging BICs become steerable in the reciprocal space.Merging BICs provide a paradigm to achieve robust ultrahigh-Q resonances,which are important in enhancing nonlinear and quantum effects and improving the performance of optoelectronic devices.

关键词： topological charges states

Transferring entangled states of photonic cat-state qubits in circuit QED

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Frontiers of physics 2020年第2期15卷 27-37页

作者： Tong Liu Zhen-Fei Zheng Yu Zhang Yu-Liang Fang Chui-Ping Yang Quantum Information Research Center Shangrao Normal UniversityShangrao 334001China Key Laboratory of Quantum Information University of Science and Technology of ChinaHeifei 230026China School of Physics Nanjing UniversityNanjing 210093China

We propose a method for transferring quantum entangled states of two photonic cat-state qubits(cqubits)from two microwave cavities to the other two microwave cavities.This proposal is realized by using four microwave cavities coupled to a superconducting flux qutrit.Because of using four cavities with different frequencies,the inter-cavity crosstalk is significantly reduced.Since only one coupler qutrit is used,the circuit resource is minimized.The entanglement transfer is completed with a singlestep operation only,thus this proposal is quite simple.The third energy level of the coupler qutrit is not populated during the state transfer,therefore decoherence from the higher energy level is greatly suppressed.Our numerical simulations show that high-fidelity transfer of two-cqubit entangled states from two transmission line resonators to the other two transmission line resonators is feasible with current circuit QED technology.This proposal is universal and can be applied to accomplish the same task in a wide range of physical systems,such as four microwave or optical cavities,which are coupled to a natural or artificial three-level atom.

关键词： transferring quantum entangled states photonic cat-state microwave cavities