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"Yan, J."
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Heart, smarts, guts, and luck : what it takes to be an entrepreneur and build a great business
Examines the traits that define most people who achieve success, heart, smarts, guts, and luck, and helps readers to determine which traits they possess.
Book
Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
The coexistence and competition between superconductivity and electronic orders, such as spin or charge density waves, have been a central issue in high transition-temperature (
T
c
) superconductors. Unlike other iron-based superconductors, FeSe exhibits nematic ordering without magnetism whose relationship with its superconductivity remains unclear. Moreover, a pressure-induced fourfold increase of
T
c
has been reported, which poses a profound mystery. Here we report high-pressure magnetotransport measurements in FeSe up to ∼15 GPa, which uncover the dome shape of magnetic phase superseding the nematic order. Above ∼6 GPa the sudden enhancement of superconductivity (
T
c
≤38.3 K) accompanies a suppression of magnetic order, demonstrating their competing nature with very similar energy scales. Above the magnetic dome, we find anomalous transport properties suggesting a possible pseudogap formation, whereas linear-in-temperature resistivity is observed in the normal states of the high-
T
c
phase above 6 GPa. The obtained phase diagram highlights unique features of FeSe among iron-based superconductors, but bears some resemblance to that of high-
T
c
cuprates.
The relationship between electronic ordering and superconductivity, crucial to understand high-
T
c
superconductors, remains elusive. Here, Sun
et al
. report the pressure-induced dome shape of a magnetic phase superceding the nematic order in FeSe, suggesting competing nature between magnetism and superconductivity.
Journal Article
Twisted
Twisted' documents and explores an eleven-story garment factory building in Shantou, China, for the fashion label Lafayette 148. The book presents the building as an artifact of architecture, with detailed documentation of images and drawings. The book also presents essays that offer a series of distinct but interrelated responses to the many questions that arise when building a garment factory facility in contemporary China. Issues addressed range from the architectural import of the building typology, to the ecological footprint of a factory, to social and architectural concerns regarding labor as well as construction practices, to the ethics and aesthetics of factory building.0Clear tensions exist between the global and the local, with respect to issues such as material economies, labor relations, working conditions, and company branding. The book investigates the role of design in all of this. For what can the architect be held responsible in contemporary praxis. Is it ultimately possible to address the social inequalities produced by global garment manufacturing through design?0This book is not a monograph, but includes extensive documentation of the design process, the development of working drawings, construction technologies, as well as the completed building and a post-occupancy review of the building.
Book
A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd2Re2O7
Strong interactions among electrons in some materials can cause them to assume configurations that are less symmetric than the underlying crystal lattice. These so-called electronic nematic states usually have inversion symmetry, but theorists have predicted that in metals with strong spin-orbit coupling, the inversion symmetry can be lost. Harter et al. teased out the symmetry of the electronic order in the compound Cd2Re2O7 (see the Perspective by Dodge). They found that a known structural transition in this material is a consequence of another, previously hidden electronic order that breaks inversion symmetry. Science, this issue p. 295; see also p. 246 Strong electron interactions can drive metallic systems toward a variety of well-known symmetry-broken phases, but the instabilities of correlated metals with strong spin-orbit coupling have only recently begun to be explored. We uncovered a multipolar nematic phase of matter in the metallic pyrochlore Cd2Re2O7 using spatially resolved second-harmonic optical anisotropy measurements. Like previously discovered electronic nematic phases, this multipolar phase spontaneously breaks rotational symmetry while preserving translational invariance. However, it has the distinguishing property of being odd under spatial inversion, which is allowed only in the presence of spin-orbit coupling. By examining the critical behavior of the multipolar nematic order parameter, we show that it drives the thermal phase transition near 200 kelvin in Cd2Re2O7 and induces a parity-breaking lattice distortion as a secondary order.
Journal Article
Reciprocity, evolution, and decision games in network and data science
\"Learn how to analyze and manage evolutionary and sequential user behaviors in modern networks, and how to optimize network performance by using indirect reciprocity, evolutionary games, and sequential decision-making. Understand the latest theory without the need to go through the details of traditional game theory. With practical management tools to regulate user behavior and simulations and experiments with real data sets, this is an ideal tool for graduate students and researchers working in networking, communications, and signal processing\"-- Provided by publisher.
Book
Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet
Quantum spin liquids (QSLs) are topological states of matter exhibiting remarkable properties such as the capacity to protect quantum information from decoherence. Whereas their featureless ground states have precluded their straightforward experimental identification, excited states are more revealing and particularly interesting owing to the emergence of fundamentally new excitations such as Majorana fermions. Ideal probes of these excitations are inelastic neutron scattering experiments. These we report here for a ruthenium-based material, α-RuCl
3
, continuing a major search (so far concentrated on iridium materials) for realizations of the celebrated Kitaev honeycomb topological QSL. Our measurements confirm the requisite strong spin–orbit coupling and low-temperature magnetic order matching predictions proximate to the QSL. We find stacking faults, inherent to the highly two-dimensional nature of the material, resolve an outstanding puzzle. Crucially, dynamical response measurements above interlayer energy scales are naturally accounted for in terms of deconfinement physics expected for QSLs. Comparing these with recent dynamical calculations involving gauge flux excitations and Majorana fermions of the pure Kitaev model, we propose the excitation spectrum of α-RuCl
3
as a prime candidate for fractionalized Kitaev physics.
Inelastic neutron scattering characterization shows that α-RuCl
3
is close to an experimental realization of a Kitaev quantum spin liquid on a honeycomb lattice. The collective excitations provide evidence for deconfined Majorana fermions.
Journal Article
كتابات عن (وحول) السينما التجريبية : نصوص ودراسات مختارة
المعنى هنا هو أن البعض قد يترجم رواية أو كتابا غير روائي أو دراسة قد لا تهمه مقتضياتها وموضوعاتها كثيرا وتكون ترجمته جيدة، لكن ما هو أجود أن يكون الاهتمام السابق والمواكب من التفاعل مع المادة المتوافرة بحيث يعرف المترجم عمليا وفعليا عما يتحدث عنه أصحاب النصوص. عبر هذه المتابعة واختياراته من النصوص يكشف لمن يريد عن التاريخ الجلي للسينما التجريبية والتعريف الصادق لنوع محير في تصنيفه حتى بالنسبة إلى كثير من النقاد حول العالم. يختار سرميني من الكتابات ما يكشف عن مواطن المحاولات الأولى واللاحقة منتقلا ما بين التجارب الفرنسية والأميركية وسواها وموضحا ما تعنيه الكلمة تحديدا، وكيف لجأت الأفلام التجريبية إلى الاختلاف طوعا ورغبة في توسيع مفردات السينما والصورة.
Book
Antisymmetric linear magnetoresistance and the planar Hall effect
The phenomena of antisymmetric magnetoresistance and the planar Hall effect are deeply entwined with ferromagnetism. The intrinsic magnetization of the ordered state permits these unusual and rarely observed manifestations of Onsager’s theorem when time reversal symmetry is broken at zero applied field. Here we study two classes of ferromagnetic materials, rare-earth magnets with high intrinsic coercivity and antiferromagnetic pyrochlores with strongly-pinned ferromagnetic domain walls, which both exhibit antisymmetric magnetoresistive behavior. By mapping out the peculiar angular variation of the antisymmetric galvanomagnetic response with respect to the relative alignments of the magnetization, magnetic field, and electrical current, we experimentally distinguish two distinct underlying microscopic mechanisms: namely, spin-dependent scattering of a Zeeman-shifted Fermi surface and anomalous electron velocities. Our work demonstrates that the anomalous electron velocity physics typically associated with the anomalous Hall effect is prevalent beyond the
ρ
xy
(
H
z
) channel, and should be understood as a part of the general galvanomagnetic behavior.
Magnetoresitance (MR) is a tool to study electronic transport and spin order in metals. Here, the authors demonstrate two different microscopic origins of antisymmetric linear MR from both Zeeman-split Fermi surface and anomalous electron velocity.
Journal Article
Selective laser melting of H13: microstructure and residual stress
In this research, samples of the H13 steel, a commonly used hot work tool steel in the die/mould manufacturing industry, were additively manufactured using selective laser melting (SLM). Their as-built microstructures were characterised in detail using transmission electron microscopy (TEM) and compared with that of the conventionally manufactured H13 (as-supplied). SLM resulted in the formation of martensite and also its partial decomposition into fine α-Fe and Fe
3
C precipitates along with retained austenite. TEM analyses further revealed that the lattice of the resulting α-Fe phase is slightly distorted due to enhanced Cr, Mo and V contents. Substantially high residual stresses in the range of 940–1420 MPa were detected in the as-built H13 samples compared with its yield strength of ~1650 MPa. In addition, it was identified that the high residual stress existed from just about two additive layers (100 µm) above the substrate along the build direction. The high residual stresses were mainly attributed to the martensitic transformation that occurred during SLM. The research findings of this study suggest that the substantially high residual stresses can be easily problematic in the AM of intricate H13 dies or moulds by SLM.
Journal Article
Diverse polarization angle swings from a repeating fast radio burst source
Fast radio bursts (FRBs) are millisecond-duration radio transients
1
,
2
of unknown origin. Two possible mechanisms that could generate extremely coherent emission from FRBs invoke neutron star magnetospheres
3
–
5
or relativistic shocks far from the central energy source
6
–
8
. Detailed polarization observations may help us to understand the emission mechanism. However, the available FRB polarization data have been perplexing, because they show a host of polarimetric properties, including either a constant polarization angle during each burst for some repeaters
9
,
10
or variable polarization angles in some other apparently one-off events
11
,
12
. Here we report observations of 15 bursts from FRB 180301 and find various polarization angle swings in seven of them. The diversity of the polarization angle features of these bursts is consistent with a magnetospheric origin of the radio emission, and disfavours the radiation models invoking relativistic shocks.
Polarization observations of the fast radio burst FRB 180301 with the FAST radio telescope show diverse polarization angle swings, consistent with a magnetospheric origin of the emission.
Journal Article