Materials Today Quantum最新文献_第3页

Determination of band alignment of core/shell colloidal CdSe/CdS quantum dots, by optical and X-ray photo-electron spectroscopies 用光学和x射线光电子能谱法测定核/壳胶体CdSe/CdS量子点的能带排列

Materials Today Quantum Pub Date : 2025-01-30 DOI: 10.1016/j.mtquan.2025.100024

Damien Simonot , Céline Roux-Byl , Xiangzhen Xu , Willy Daney de Marcillac , Corentin Dabard , Mathieu G. Silly , Emmanuel Lhuillier , Thomas Pons , Simon Huppert , Agnès Maître

{"title":"Determination of band alignment of core/shell colloidal CdSe/CdS quantum dots, by optical and X-ray photo-electron spectroscopies","authors":"Damien Simonot , Céline Roux-Byl , Xiangzhen Xu , Willy Daney de Marcillac , Corentin Dabard , Mathieu G. Silly , Emmanuel Lhuillier , Thomas Pons , Simon Huppert , Agnès Maître","doi":"10.1016/j.mtquan.2025.100024","DOIUrl":"10.1016/j.mtquan.2025.100024","url":null,"abstract":"<div><div>Optical properties of multilayer semi-conductor nano-emitters are crucially dependent on the relative energy levels of their different components. For core/shell quantum dots, the relative energy difference between conduction band edge of core and shell materials induces, depending on its value, either a confinement of the electron within the core or a delocalization of its wave function within the whole quantum dot. This results in drastic consequences on the energy and the oscillator strength of the transitions. Surprisingly, the literature currently lacks a definitive value for this energy difference, called offset, between the conduction band edge of CdSe and CdS materials. Here, we develop a theoretical model expressing energy levels and considering quantum dot dimension, core/shell interface pressure, ligands and allowing to reliably determine the conduction band offset. Its value is determined experimentally using our model and both optical and X-ray photoelectron (XPS) spectroscopies.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"5 ","pages":"Article 100024"},"PeriodicalIF":0.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards dissipationless topotronics 走向无耗散地形学

Materials Today Quantum Pub Date : 2025-01-16 DOI: 10.1016/j.mtquan.2025.100023

Qing Yan , Hailong Li , Hua Jiang , X.C. Xie

{"title":"Towards dissipationless topotronics","authors":"Qing Yan , Hailong Li , Hua Jiang , X.C. Xie","doi":"10.1016/j.mtquan.2025.100023","DOIUrl":"10.1016/j.mtquan.2025.100023","url":null,"abstract":"<div><div>Many aspects of topological physics offer a promising paradigm for the development of dissipationless electronic and quantum computing devices. Topological materials exhibit quantized transport and unidirectional edge states, which are inherently robust against backscattering and were thus previously assumed to be dissipationless. However, recent advancements in nanoscale thermal imaging have uncovered localized heat generation in these materials, highlighting an urgent need to reassess energy dissipation issues in topological systems. In this Perspective, we review recent progress in understanding energy dissipation in topological systems, including experimental observations enabled by pioneering thermal imaging techniques and theoretically proposed mechanisms. Central to this discussion is the recognition that energy dissipation arises from the evolution of carriers' energy distribution, independent of quantized electrical signatures. We discuss emerging criteria to identify dissipationless topological devices, providing guidance for the design of next-generation topotronics. Finally, we outline future directions, including the exploration of additional degrees of freedom, superconducting regimes, and non-Abelian operations, as well as the advancement of measurement techniques and scalable manufacturing processes, and especially emphasizing the importance of experimental verification of theoretical mechanisms.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"5 ","pages":"Article 100023"},"PeriodicalIF":0.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Linear and nonlinear Edelstein effects in chiral topological semimetals 手性拓扑半金属中的线性和非线性Edelstein效应

Materials Today Quantum Pub Date : 2025-01-01 DOI: 10.1016/j.mtquan.2024.100022

Haowei Xu , Ju Li

{"title":"Linear and nonlinear Edelstein effects in chiral topological semimetals","authors":"Haowei Xu , Ju Li","doi":"10.1016/j.mtquan.2024.100022","DOIUrl":"10.1016/j.mtquan.2024.100022","url":null,"abstract":"<div><div>Recently, there has been growing interest in achieving on-demand control of magnetism through electrical and optical means. In this work, we provide first-principles predictions for the linear and nonlinear Edelstein effects (LEE and NLEE) in the chiral topological semimetal CoSi. The LEE and NLEE represent first- and second-order magnetic responses to external electric fields, enabling precise manipulation of magnetization via electrical and optical methods. We demonstrate that although both LEE and NLEE require time-reversal symmetry breaking, they can still be realized in non-magnetic materials, as time-reversal symmetry can be spontaneously broken by heat and dissipation, according to the second law of thermodynamics. Meanwhile, due to different inversion symmetry selection rules, the LEE and NLEE manifest opposite and identical signs in the two enantiomers of CoSi, respectively. We further quantify the magnitude of LEE and NLEE, showing that electrically or optically induced magnetization can reach 10 Bohr magneton per unit cell when the external electric field strength is comparable with the internal atomic electric field, which is on the order of 1 V/Å. Our work offers a systematical approach for predicting the electrical and optical control of magnetism in real materials, paving the way for potential applications in areas such as spintronics and magnetic memories.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"5 ","pages":"Article 100022"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microwave-assisted synthesis of sulfur-doped carbon quantum dots and their application in logic gate operations 硫掺杂碳量子点的微波辅助合成及其在逻辑门运算中的应用

Materials Today Quantum Pub Date : 2024-12-17 DOI: 10.1016/j.mtquan.2024.100021

Lijun Liu , Xiangru Hou , Lu Ga , Yanqing Du , Jun Ai , Gerile Aodeng

引用次数: 0

Tutorial: Extracting entanglement signatures from neutron spectroscopy 教程：从中子光谱学中提取纠缠特征

Materials Today Quantum Pub Date : 2024-12-16 DOI: 10.1016/j.mtquan.2024.100020

Allen Scheie , Pontus Laurell , Wolfgang Simeth , Elbio Dagotto , D. Alan Tennant

引用次数: 0

Conversion between dipoles with different spatial parities by circularly polarized light 圆偏振光在不同空间偶极子间的转换

Materials Today Quantum Pub Date : 2024-12-12 DOI: 10.1016/j.mtquan.2024.100019

Satoru Hayami

引用次数: 0

Topological magnetic defects in a strong permanent magnet Nd2Fe14B 强永磁体 Nd2Fe14B 中的拓扑磁性缺陷

Materials Today Quantum Pub Date : 2024-10-09 DOI: 10.1016/j.mtquan.2024.100017

Juyoung Jeong , Yongwoo Lee , Shi-Zeng Lin , Yoon Hee Jeong , Hye Jung Chang , Jeehoon Kim

引用次数: 0

Synthesis of temperature-sensitive boron, nitrogen and sulphur doped carbon dots and their applications 温度敏感的硼、氮和硫掺杂碳点的合成及其应用

Materials Today Quantum Pub Date : 2024-10-04 DOI: 10.1016/j.mtquan.2024.100018

Pingping Liu , Lu Fu , Gerile Aodeng , Lu Ga , Jun Ai

引用次数: 0

Nanometric modulations of the magnetic structure of the element Nd 钕元素磁性结构的纳米调制

Materials Today Quantum Pub Date : 2024-09-23 DOI: 10.1016/j.mtquan.2024.100016

H. Suriya Arachchige , L.M. DeBeer-Schmitt , L.L. Kish , Binod K. Rai , A.F. May , D.S. Parker , G. Pokharel , Wei Tian , Matthew B. Stone , Matthias Frontzek , D.G. Mandrus , M. Bleuel , Z. Islam , G. Fabbris , H.X. Li , S. Gao , H. Miao , S.M. Thomas , P.F.S. Rosa , J.D. Thompson , A.D. Christianson

{"title":"Nanometric modulations of the magnetic structure of the element Nd","authors":"H. Suriya Arachchige , L.M. DeBeer-Schmitt , L.L. Kish , Binod K. Rai , A.F. May , D.S. Parker , G. Pokharel , Wei Tian , Matthew B. Stone , Matthias Frontzek , D.G. Mandrus , M. Bleuel , Z. Islam , G. Fabbris , H.X. Li , S. Gao , H. Miao , S.M. Thomas , P.F.S. Rosa , J.D. Thompson , A.D. Christianson","doi":"10.1016/j.mtquan.2024.100016","DOIUrl":"10.1016/j.mtquan.2024.100016","url":null,"abstract":"<div><div>The rare earth neodymium arguably exhibits the most complex magnetic ordering and series of magnetic phase transitions of the elements. Here we report the results of small-angle neutron scattering (SANS) measurements as a function of temperature and applied magnetic field to study magnetic correlations on nanometer length scales in Nd. We support these results with additional neutron diffraction, thermodynamic and synchrotron x-ray measurements. The SANS measurements reveal the presence of modulation vectors characterizing the ordered spin configuration which exhibit changes in magnitude and direction that are phase dependent. Between 5.9 and 7.6 K an additional modulation vector is observed with magnitude <span><math><mi>Q</mi></math></span> = 0.12 Å <sup>−1</sup>. This scattering appears to originate from order of the Nd layers which contain a center of inversion. Tracking this modulation vector as a function of magnetic field indicates a phase boundary at <span><math><mo>≈</mo></math></span>1 T. The modulation vectors observed in this study establish the presence of nanometer length scale spin textures which are likely stabilized by frustrated Ruderman–Kittel–Kasuya–Yosida (RKKY) interactions.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"4 ","pages":"Article 100016"},"PeriodicalIF":0.0,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Materials Today Quantum Pub Date : 2024-09-21 DOI: 10.1016/j.mtquan.2024.100015

Geng-Dong Zhou , Yi-Jie Wang , Wen-Xuan Wang , Xiao-Bo Lu , Zhi-Da Song

{"title":"Correlated insulators and charge density wave states in chirally twisted triple bilayer graphene","authors":"Geng-Dong Zhou , Yi-Jie Wang , Wen-Xuan Wang , Xiao-Bo Lu , Zhi-Da Song","doi":"10.1016/j.mtquan.2024.100015","DOIUrl":"10.1016/j.mtquan.2024.100015","url":null,"abstract":"<div><div>Motivated by recent experimental observations of displacement-field-tuned correlated insulators at integer and half-integer fillings in chirally twisted triple bilayer graphene (CTTBG) [<span><span>Phys.Rev.Lett.132.246501</span><svg><path></path></svg></span>], we study the single-particle and interacting physics of CTTBG. We find that there are two inequivalent stacking orders, <em>i.e.</em>, AB-AB-BC and AB-AB-AB, and both exhibit flat bands with nontrivial topology. We then use the Hartree–Fock approximation to calculate the rich phase diagram of CTTBG at all integer and half-integer fillings in both stacking orders and under the vertical displacement field. Under a small displacement field, the groundstates are flavor polarized states for AB-AB-BC stacking order and intervalley coherent states for AB-AB-AB stacking order at all integer and half-integer fillings. A larger displacement field will turn them into layer-polarized states. At half-integer fillings, the groundstates also exhibit charge density wave (CDW) order. For AB-AB-AB stacking, the groundstates at half-integer fillings are always 2 × 1 stripe state among a range of displacement fields. For AB-AB-BC stacking, the groundstates at half-integer fillings are also 2 × 1 stripe states under a small displacement field and a larger displacement will possibly favor further translation-symmetry-breaking, depending on filling and the direction of the displacement field. We demonstrate that the CDW states observed in the experiment can originate from the strong Coulomb interaction of the flat band electrons.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"4 ","pages":"Article 100015"},"PeriodicalIF":0.0,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142328356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0