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1.
Quantized Anomalous Hall Effect in Magnetic Topological Insulators   总被引：1，自引：1，他引：0  
The Hall effect, the anomalous Hall effect (AHE) and the spin Hall effect are fundamental transport processes in solids arising from the Lorentz force and the spin-orbit coupling respectively. The AHE, in which a voltage transverse to the electric current appears even in the absence of an external magnetic field, was first detected in ferromagnetic (FM) metals in 1881 and later found to arise from the spin-orbit coupling (SOC) between the current and magnetic moments.  相似文献   

2.
Wireless power transfer(WPT) technology based on magnetic resonance(a basic physical phenomenon)can directly transfer energy from the source to the load without wires and other physical contacts, and has been successfully applied to implantable medical devices, electric vehicles, robotic arms and other fields.However, due to the frequency splitting of near-field coupling, the resonant WPT system has some unique limitations, such as poor transmission stability and low efficiency. Here, we propose...  相似文献   

3.
正Microalgae are organisms that can use sunlight to capture and assimilate atmospheric CO_2.They then store the solar energy and CO_2 in the form of energy-dense molecules such as triacylglycerol(TAG),which can be readily converted to oil.Therefore,the interest in microalgae as a scalable solution for clean fuel production and CO_2 sequestration has been growing.  相似文献   

4.
The activities of the government can be described as reporting the feelings of the people (receiving infor-mation), making policies (processing information) and issuing government orders (sending out information). This is a typical course of information processing. If we can successively trail and scientifically measure this information course, we will be able to appraise the performance of the government in a scientific way. The development of government informatiza-tion and e-government is providing such a kind of appraisement for the government. The paper mainly discusses the possi-bilities of informetric analysis of the e-government. Methods for such analysis are also described.  相似文献   

5.
Representing new states of quantum matter, topological insulators are characterized by an insulating gap in the bulk state and a robust metallic surface or edge state protected by time-reversal symmetry. Topological surthce states have been theoretically predicted and experimentally observed in three-dimensional materials such as A2B3-type compounds of Bi2Se3, Bi2Te3, and Sb,Te3. Similar to topological insulators,  相似文献   

6.
<正>Novel Topological Orders In the field of topological states of matter,scientists at the Institute of Physics(IOP),CAS predicted a series of novel topological orders of matter and verified the theoretical predictions in a series of novel materials.In 2009,IOP physicists predicted Bi_2Te_3,Bi_2Se_3,and Sb_2Te_3 as three-dimension topological insulators.Later experimentally validated,these materials have now become the most widely studied topological insulators.During the period from 2012 to 2014,IOP scientists theoretically predicted and experimentally verified two Dirac semimetals,namely Na_3Bi and Cd_3As_2,establishing the semimetal state as a new state of matter.  相似文献   

7.
正Glass is a nonequilibrium state that continually relaxes toward a metastable equilibrium state by structural rearrangements.What is mysterious is that its past state is always memorized,viz.,showing memory effect.Glass exhibits disordered structure and anomalous atomic vibration as compared to ordered crystals,and this anomaly is termed as a boson peak.These two features,both are central to the understanding of glass,are generally investigated separately.  相似文献   

8.
<正>Interface polarization between commonly used semiconductors provides a possible method to drive commonly used semiconductors into their topological insulating phase.Topological insulators(TIs)have attracted interest over recent years,with properties such as an insulating bulk region,robust metallic edges or surface modes and topological excitations.hey have potential applications ranging from spintronic devices to quantum computation[1–8].Despite recent progress,  相似文献   

9.
<正>A strong motivation for studying mass extinctions is understanding how current climatic and biodiversity crises will affect creatures living on land such as ourselves. Perhaps the question is: how bad can it get? In that case, terrestrial Permian-Triassic mass extinctions are an irresistible worst-case scenario [1].  相似文献   

10.
<正>When an electric current lows through a conined two-dimensional(2D)electron gas,which is under an external high magnetic ield(H)along the z direction,the magnetic ield will delect the current.A transverse quantized Hall conductance can then be observed across the sample.his efect,known as the quantum Hall efect(QHE),was discovered in 1980 by  相似文献   

11.
正Topological superconductor is one of the most popular topics in condensed matter physics.Its exotic quasi-particle excitation,known as Majorana mode,can be used to build topological quantum computer.According to previous theoretical and experimental studies,topological superconductivity  相似文献   

12.
<正>Water lowing down a pipe experiences viscous drag that causes it to lose energy and slow down.A superluid,such as liquid helium(3He and4He)or electrons in a superconductor,can low without friction when in contact with a wall.his fascinating phenomenon,or superluidity,was discovered by Kapitza[1],Allen and Misener[2]in 1937.he formation of a superluid is related to the formation of a Bose–Einstein condensate(BEC).4He is a boson  相似文献   

13.
Most flowering plants arebisexual with both maleand female gametes onthe same individual or flower. Self-pollination or inbreeding often leadsto a gradual decline in geneticdiversity, which can cause the wholespecies to die off during evolution.To prevent inbreeding, some plantshave evolved self-incompatibility(SI) mechanisms to recognize andreject self pollen. In self-incompat-ible plants such as petunia and Anti-rrhinum (Figure 1), pollen from thesame plant or other plant with thesame geno…  相似文献   

14.
in Internet relay chat too. Introduction Although a number of linguists such as Baron (2000), Crystal (2001) and Hillier (2004) have begun to explore and describe some of the changes in function and form of written language as a consequence of technological developments and the rise of the internet, computer mediated communication is still relatively less explored. As for the pragmatic interpretation of Internet chat, much less work has been done. This paper is a study of conversational patt…  相似文献   

15.
Dark matter(DM) is a form of matter necessary to account for gravitational effects observed in very large scale structures such as anomalies in the rotation of galaxies and the gravitational lensing of light by galaxy clusters that cannot be accounted for by the quantity of observed matter (Bertone et al.2005).In the standard cosmology model.  相似文献   

16.
正In adult tissues,stem cells are defined by their unique capacity to self-renew and produce nonequivalent daughters that can differentiate into cell lineages to maintain tissue homeostasis.Misregulation of stem cell functions has been implicated in a variety of human diseases such as degenerative diseases and cancer.Thus,understanding the regulatory mechanisms  相似文献   

17.
It is a relatively common phenomenon to limit technical features with parameter range in patent claims. It is argued in this article that the parameter range should be distinctly divided into single parameter range and whole parameter range depending on the different mode and function of limitation. Each and every parameter in a single parameter range may independently achieve a technical effect, and limit one embodiment alone; while a single parameter in the whole parameter range cannot independently achieve any technical effect, and the set of parameters as a whole within the parameter range limit a technical feature. Discrimination between the single parameter range and the whole parameter range has a bearing on the assessment of novelty and inventiveness. Owing to the absence of such discrimination of parameter range, the provisions of the current Guidelines for Examination on novelty and inventiveness of the claims relating to parameter range are not applicable to the circumstance of whole parameter range.  相似文献   

18.
<正>1. Introduction Modern physics and astronomy are now obscured by two "dark clouds," namely, dark matter and dark energy.All the stuff that we are familiar with in our everyday life,such as flowers, rocks, water and air, which are made of molecules or atoms, including electrons and photons,constitutes only 5% of the energy content of the universe.Even the standard model of elementary particles, the most successful ever, is only able to explain such a small  相似文献   

19.
XML的显示   总被引：2，自引：0，他引：2  
Tbe eXtensible Markup Language(XML)describes a document's structure and content, not the style of the elements on the page. The style can be added to a document with a style sheet. Both Cascading Style Sheet(CSS)and eXtensible Style Languange(XSL)can produce such a style sheet. The HyperText Markup Language(HTML) provides a markup that looks like < xml > , by which XML document can be easily bound to some HTML elements.  相似文献   

20.
<正>Zika virus(ZIKV),a flavivirus,is causing global concern,as accumulating evidence suggests that its infection is associated with microcephaly in newborns and neurological complications,such as Guillain-Barrésyndrome,in adults;and currently no approved countermeasure against ZIKV infections is available.This concern is further emphasized by  相似文献   

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