日本免费全黄少妇一区二区三区-高清无码一区二区三区四区-欧美中文字幕日韩在线观看-国产福利诱惑在线网站-国产中文字幕一区在线-亚洲欧美精品日韩一区-久久国产精品国产精品国产-国产精久久久久久一区二区三区-欧美亚洲国产精品久久久久

  1. 首頁(yè) > 云知道 > >

roaming文件夾是干嘛的 roaming文件夾

云知道roaming文件夾


roaming文件夾是干嘛的 roaming文件夾


編譯｜馮維維
Science, 26 NOVEMBER 2021, VOL 374, ISSUE 6571
《科學(xué)》2021年11月26日 ， 第374卷 ， 6571期
物理學(xué)Physics
Direct visualization of magnetic domains and moiré magnetism in twisted 2D magnets
在扭曲的二維磁體中磁疇和moiré磁性的直接可視化
▲ 作者：TIANCHENG SONG, QI-CHAO SUN, ERIC ANDERSON, CHONG WANGJIMIN QIANTAKASHI TANIGUCHI, KENJI WATANABE, MICHAEL A. MCGUIR, RAINER ST?HR, XIAODONG XU
▲ 鏈接：
https://www.science.org/doi/10.1126/science.abj7478
▲ 摘要
【roaming文件夾是干嘛的 roaming文件夾】石墨烯的單分子扭轉(zhuǎn)層導(dǎo)致了許多不尋常的相關(guān)狀態(tài) 。這種方法激發(fā)了研究人員嘗試扭轉(zhuǎn)二維磁鐵 ， 但這種實(shí)驗(yàn)被證明是一個(gè)艱巨的挑戰(zhàn) 。
作者用小扭曲角的二維磁鐵三碘化鉻層制作了結(jié)構(gòu) 。利用金剛石中的氮空位中心作為磁強(qiáng)計(jì) ， 對(duì)扭曲單層結(jié)構(gòu)和扭曲三層結(jié)構(gòu)的磁疇進(jìn)行了成像 。發(fā)現(xiàn)了扭曲三層薄膜的鐵磁和反鐵磁疇的周期性模式 。
▲ Abstract
Twisting monolayers of graphene with respect to each other has led to a number of unusual correlated states. This approach has inspired researchers to try their hand at twisting two-dimensional (2D) magnets, but such experiments have proven a difficult challenge. Song et al. made structures out of layers of the 2D magnet chromium triiodide with a small twist angle (see the Perspective by Lado). Using nitrogen vacancy centers in diamond as a magnetometer, the authors imaged the magnetic domains in both twisted monolayer and twisted trilayer structures. For twisted trilayers, a periodic pattern of ferromagnetic and antiferromagnetic domains was revealed.
Floquet Hamiltonian engineering of an isolated many-body spin system
孤立多體自旋系統(tǒng)的弗洛奎特哈密頓工程
▲ 作者：SEBASTIAN GEIER, NITHIWADEE THAICHAROEN, CLéMENT HAINAUT, TITUS FRANZ, ANDRE SALZINGER, XANNIKA TEBBEN, DAVID GRIMSHANDL, GERHARD ZüRN, AND MATTHIAS WEIDEMüLLER
▲ 鏈接：
https://www.science.org/doi/10.1126/science.abd9547
▲ 摘要
控制相互作用是多體系統(tǒng)量子工程的關(guān)鍵要素 。利用時(shí)間周期驅(qū)動(dòng) ， 一個(gè)封閉量子系統(tǒng)的自然給定的多體哈密頓量可以轉(zhuǎn)化為一個(gè)表現(xiàn)出極大不同動(dòng)力學(xué)特性的有效目標(biāo)哈密頓量 。
作者在超冷的原子氣體中用里德堡態(tài)代表的自旋系統(tǒng)來(lái)演示弗洛奎特工程 。通過(guò)應(yīng)用一系列自旋操作 ， 他們改變了有效海森堡XYZ哈密頓量的對(duì)稱性 。因此 ， 總自旋的松弛行為被極大地改變了 。
觀測(cè)到的動(dòng)力學(xué)可以用半經(jīng)典模擬來(lái)定性地捕捉 。設(shè)計(jì)廣泛的哈密頓量為在單一的實(shí)驗(yàn)設(shè)置中實(shí)現(xiàn)非平衡動(dòng)力學(xué)的量子模擬提供了巨大的機(jī)會(huì) 。
▲ Abstract
Controlling interactions is the key element for the quantum engineering of many-body systems. Using time-periodic driving, a naturally given many-body Hamiltonian of a closed quantum system can be transformed into an effective target Hamiltonian that exhibits vastly different dynamics. We demonstrate such Floquet engineering with a system of spins represented by Rydberg states in an ultracold atomic gas. By applying a sequence of spin manipulations, we change the symmetry properties of the effective Heisenberg XYZ Hamiltonian. As a consequence, the relaxation behavior of the total spin is drastically modified. The observed dynamics can be qualitatively captured by a semiclassical simulation. Engineering a wide range of Hamiltonians opens vast opportunities for implementing quantum simulation of nonequilibrium dynamics in a single experimental setting.
化學(xué)Chemistry
Accelerated dinuclear palladium catalyst identification through unsupervised machine learning

推薦閱讀