Materials Today Quantum最新文献_第5页

Quantum Heisenberg spin chains in reconstructed armchair graphene nanoribbons towards ballistic quantum spin transport 重建扶手椅石墨烯纳米带中量子海森堡自旋链的弹道量子自旋输运

Materials Today Quantum Pub Date : 2025-03-01 Epub Date: 2025-02-26 DOI: 10.1016/j.mtquan.2025.100028

Ning Wu , Bang-Gui Liu

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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 : 2025-03-01 Epub Date: 2024-12-16 DOI: 10.1016/j.mtquan.2024.100020

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

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Compensation doping of the qubit host Ba2CaWO6-δ 量子比特主体Ba2CaWO6-δ的补偿掺杂

Materials Today Quantum Pub Date : 2025-03-01 Epub Date: 2025-02-18 DOI: 10.1016/j.mtquan.2025.100029

Abby N. Neill , Lucas A. Pressley , Tyrel M. McQueen

{"title":"Compensation doping of the qubit host Ba2CaWO6-δ","authors":"Abby N. Neill , Lucas A. Pressley , Tyrel M. McQueen","doi":"10.1016/j.mtquan.2025.100029","DOIUrl":"10.1016/j.mtquan.2025.100029","url":null,"abstract":"<div><div>Emerging quantum information science (QIS) technologies require advances in controlling the type, number, and distribution of defects in complex crystalline matter. Building on recent reports of promising spin-lattice relaxation times in oxygen-vacancy-induced W<sup>5+</sup> centers in the double perovskite Ba<sub>2</sub>CaWO<sub>6-δ</sub>, here we report on the viability of compensation doping with Zr<sup>4+</sup> and Ge<sup>4+</sup> to tune the number of active W<sup>5+</sup> centers, a pre-requisite for mitigating spin bath effects and increasing spin-spin relaxation times. We prepared single crystals of nominal composition Ba<sub>2</sub>CaW<sub>1-x</sub>M<sub>x</sub>O<sub>6-δ</sub> (M = Zr<sup>4+</sup>, Ge<sup>4+</sup>) for x = 0–0.20. Electron paramagnetic resonance (EPR) and DC magnetic susceptibility measurements were used to understand the changes in spin-active defects as a function of substitution. We find that x = 0.01 (M = Zr<sup>4+</sup>) and x = 0.03 (M = Ge<sup>4+</sup>) are sufficient to quench the W<sup>5+</sup> S = ½ EPR response (g = 2.00) within our limit of detection. Further substitution results in the appearance of a narrow S = ½ response (g = 1.98–2.00) that fades away at higher compositions. We conclude that compensation doping is an effective strategy for modulation of single ion centers in Ba<sub>2</sub>CaWO<sub>6-δ</sub> and identify future steps that are needed to bring such complex materials to viability for QIS technologies, including proposal of an easily measured figure of merit for rapid materials iteration and optimization.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"5 ","pages":"Article 100029"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510809","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

An overview on metal-doped carbon dots uses for biomedical applications 金属掺杂碳点在生物医学上的应用综述

Materials Today Quantum Pub Date : 2025-03-01 Epub Date: 2025-02-25 DOI: 10.1016/j.mtquan.2025.100030

Miriam Ala , Claudia Suriano , Mattia Bartoli , Alberto Tagliaferro

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Programming an optical lattice interferometer 光栅干涉仪编程

Materials Today Quantum Pub Date : 2025-03-01 Epub Date: 2025-02-25 DOI: 10.1016/j.mtquan.2025.100026

Lennart Maximilian Seifert , Victor E. Colussi , Michael A. Perlin , Pranav Gokhale , Frederic T. Chong

{"title":"Programming an optical lattice interferometer","authors":"Lennart Maximilian Seifert , Victor E. Colussi , Michael A. Perlin , Pranav Gokhale , Frederic T. Chong","doi":"10.1016/j.mtquan.2025.100026","DOIUrl":"10.1016/j.mtquan.2025.100026","url":null,"abstract":"<div><div>Programming a quantum device describes the usage of quantum logic gates, agnostic of hardware specifics, to perform a sequence of operations with (typically) a computing or sensing task in mind. Such programs have been executed on gate-based quantum computers, which despite their noisy character, have shown the ability to optimize metrological functions, for example in the generation of spin squeezing and optimization of quantum Fisher information for signals manifesting as spin rotations in a quantum register. However, the qubits of these programmable quantum sensors are tightly spatially confined and therefore suboptimal for enclosing the kinds of large spacetime areas required for performing inertial sensing. In this work, we derive a set of quantum logic gates for a cold atom optical lattice interferometer that manipulates the momentum of atoms. Here, the operations are framed in terms of single qubit operations and mappings between qubit subspaces with internal levels given by the Bloch (crystal) eigenstates of the lattice. We describe how the quantum optimal control method of direct collocation is well suited for obtaining modulation waveforms of an optical lattice to achieve these operations in existing experimental setups.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"5 ","pages":"Article 100026"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620277","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

Damping enhancement in YIG at millikelvin temperatures due to GGG substrate GGG衬底在毫开尔文温度下对YIG的阻尼增强

Materials Today Quantum Pub Date : 2025-03-01 Epub Date: 2025-02-05 DOI: 10.1016/j.mtquan.2025.100025

Rostyslav O. Serha , Andrey A. Voronov , David Schmoll , Rebecca Klingbeil , Sebastian Knauer , Sabri Koraltan , Ekaterina Pribytova , Morris Lindner , Timmy Reimann , Carsten Dubs , Claas Abert , Roman Verba , Michal Urbánek , Dieter Suess , Andrii V. Chumak

{"title":"Damping enhancement in YIG at millikelvin temperatures due to GGG substrate","authors":"Rostyslav O. Serha , Andrey A. Voronov , David Schmoll , Rebecca Klingbeil , Sebastian Knauer , Sabri Koraltan , Ekaterina Pribytova , Morris Lindner , Timmy Reimann , Carsten Dubs , Claas Abert , Roman Verba , Michal Urbánek , Dieter Suess , Andrii V. Chumak","doi":"10.1016/j.mtquan.2025.100025","DOIUrl":"10.1016/j.mtquan.2025.100025","url":null,"abstract":"<div><div>Quantum magnonics aims to exploit the quantum mechanical properties of magnons for nanoscale quantum information technologies. Ferrimagnetic yttrium iron garnet (YIG), which offers the longest magnon lifetimes, is a key material typically grown on gadolinium gallium garnet (GGG) substrates for structural compatibility. However, the increased magnetic damping in YIG/GGG systems below 50K poses a challenge for quantum applications. Here, we study the damping in a 97nm-thick YIG film on a <span><math><mrow><mn>500</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>-thick GGG substrate at temperatures down to 30mK using ferromagnetic resonance (FMR) spectroscopy. We show that the dominant physical mechanism for the observed tenfold increase in FMR linewidth at millikelvin temperatures is the non-uniform bias magnetic field generated by the partially magnetized paramagnetic GGG substrate. Numerical simulations and analytical theory show that the GGG-driven linewidth enhancement can reach up to 6.7 times. In addition, at low temperatures and frequencies above 18GHz and temperatures below 2K and frequencies above 10GHz, the FMR linewidth deviates from the viscous Gilbert-damping model. These results allow the partial elimination of the damping mechanisms attributed to GGG, which is necessary for the advancement of solid-state quantum technologies.</div></div>","PeriodicalId":100894,"journal":{"name":"Materials Today Quantum","volume":"5 ","pages":"Article 100025"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388110","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 : 2024-12-01 Epub 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":"2024-12-01","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

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 : 2024-12-01 Epub 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

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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 : 2024-12-01 Epub Date: 2024-10-04 DOI: 10.1016/j.mtquan.2024.100018

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

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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 : 2024-12-01 Epub 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":"2024-12-01","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