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報(bào)告人:徐小峰,廈門大學(xué)
時(shí)間:11月4日(周二)14:00
單位:中國科學(xué)院理論物理研究所
地點(diǎn):南樓6520
騰訊會(huì)議: 806-774-182
摘要:
In this talk, we present a new method for computing the ε-factorised differential equations of arbitrary Feynman integrals without requiring prior knowledge of their underlying geometry. Our algorithm proceeds in two steps. In the first step, we analyze the twisted cohomology (and its filtrations) associated with a given integral family on the maximal cut, ensuring that the resulting differential equation is expressed as a Laurent polynomial in ε. In the second step, we show how to systematically obtain the ε-factorised form by solving an appropriate set of differential constraints.
報(bào)告人簡介:
徐小峰博士畢業(yè)于北京大學(xué),獲得理論物理學(xué)博士學(xué)位。曾在瑞士伯爾尼大學(xué),德國美因茨大學(xué)擔(dān)任博士后研究員,目前在廈門大學(xué)物理系工作。他的研究領(lǐng)域主要集中在量子色動(dòng)力學(xué)(QCD)和散射振幅的精確計(jì)算,涉及高能物理中的基礎(chǔ)問題和應(yīng)用。他的工作不僅為理解粒子物理中的基本相互作用提供了重要的理論支持,還為實(shí)驗(yàn)物理提供了有力的預(yù)測。
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報(bào)告人: 胡楊瑞,BIMSA
時(shí)間:11月5日(周三)10:00
單位:中國科學(xué)院理論物理研究所
地點(diǎn):南樓6620
摘要:
This talk will focus on efforts to probe aspects of quantum gravity in asymptotically flat spacetimes through the framework of celestial holography. After a brief introduction to celestial holography,?we will dive into some recent developments on its enhanced symmetry structures,?which:
(1) reorganize the data in phase space and suggest a natural extension of the conformal collider operators;
(2) necessitate the inclusion of multi-particle operators,?whose contributions in OPEs can be derived from non-factorization channels in scattering amplitudes.
報(bào)告人簡介:
Dr. Yangrui Hu is an Assistant Professor at BIMSA. She earned her Ph.D. in physics from Brown University in 2022,?and was a postdoctoral fellow at the Perimeter Institute from 2022 to 2024 and at the University of Waterloo from 2024 to 2025. Her research interests center on theoretical physics,?specifically in the areas of high-energy theory,?quantum information,?and AI+quantum.
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報(bào)告人:蔡文炬,嶗山國家實(shí)驗(yàn)室
時(shí)間:11月5日(周三) 15:00
單位:北京大學(xué)物理學(xué)院
地點(diǎn):物理大樓北547教室
騰訊會(huì)議:181-687-970
摘要:
厄爾尼諾-南方濤動(dòng)(ENSO)現(xiàn)象發(fā)生于赤道太平洋,對全球氣候及經(jīng)濟(jì)產(chǎn)生巨大影響,因此理解其對全球變暖的響應(yīng)至關(guān)重要。最新一代氣候模式結(jié)果表明,熱帶東太平洋呈現(xiàn)出變暖速度快于周邊海區(qū)的“類厄爾尼諾”型平均態(tài)增暖現(xiàn),ENSO變率顯著增強(qiáng),表現(xiàn)為強(qiáng)厄爾尼諾強(qiáng)拉尼娜和多年持續(xù)型拉尼娜事件的增多,產(chǎn)生一系列的影響.然而,若全球變暖持續(xù)到2300年,ENSO變率將從2100年之前的增強(qiáng)變?yōu)橹蟮臏p弱,表明ENSO對全球變暖的強(qiáng)非線性響應(yīng)。
報(bào)告人簡介:
蔡文炬,澳大利亞科學(xué)院院士、美國地球物理聯(lián)合會(huì)會(huì)士、美國氣象學(xué)會(huì)會(huì)士、美國氣象學(xué)會(huì) Sverdrup 金獎(jiǎng)獲得者。曾任澳大利亞聯(lián)邦科學(xué)與工業(yè)研究組織(CSIRO)首席科學(xué)家、世界氣候變率及可預(yù)測性計(jì)劃(CLIVAR)科學(xué)指導(dǎo)委員會(huì)聯(lián)合主席、南半球海洋研究中心主任。主要從事全球氣候變率及變化研究工作,連續(xù)多年位列全球高被引學(xué)者。
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報(bào)告人:曾華凌,中國科學(xué)技術(shù)大學(xué)微尺度物質(zhì)科學(xué)國家研究中心
時(shí)間:11月5日(周三)15:00
單位:北京大學(xué)物理學(xué)院
地點(diǎn):西563會(huì)議室
摘要:
近年來,隨著系列二維層狀鐵電材料的涌現(xiàn),如 CuInP2S6、a-In2Se3等本征二維鐵電體系及眾多二維堆疊鐵電體系,二維鐵電物性研究取得了長足發(fā)展,為開發(fā)原子尺度功能電子器件提供了新機(jī)遇。在本次報(bào)告中,我們將介紹近年來二維面外鐵電物性的探索進(jìn)展,并針對二維極限條件下外電場難以對鐵電極化進(jìn)行均勻調(diào)控這一前沿難題,探討基于撓曲電效應(yīng)的二維鐵電極化普適調(diào)控策略。具體內(nèi)容包括:(1)本征a-In2Se3及滑移體系1T’-ReS2中二維面外鐵電物性的實(shí)驗(yàn)探索;(2)本征及摩爾二維鐵電疇的無損可逆撓曲調(diào)控;(3)二維面外鐵電物性的潛在器件應(yīng)用。
報(bào)告人簡介:
曾華凌,男,博士, 于2006年本科畢業(yè)于中國科學(xué)技術(shù)大學(xué)物理系,2011年在香港大學(xué)物理系獲得博士學(xué)位,2015年入選國家創(chuàng)新人才計(jì)劃青年項(xiàng)目加入中國科學(xué)技術(shù)大學(xué),現(xiàn)為微尺度物質(zhì)科學(xué)國家研究中心教授。曾華凌教授長期從事實(shí)驗(yàn)?zāi)蹜B(tài)物理研究,主要研究方向?yàn)槎S鐵電、鐵磁及量子傳感,早期在新型二維半導(dǎo)體中驗(yàn)證了電子的谷極化,近年在二維極限下開展了鐵電、鐵磁物性的實(shí)驗(yàn)探索,在Nat. Nanotech.、Nat. Commun.、Phys. Rev. X/Lett.、PNAS等國際重要學(xué)術(shù)期刊上發(fā)表多篇第一/通訊作者論文,目前他引共計(jì)9000余次,單篇引用最高達(dá)4000余次。
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報(bào)告人:楊瑋楓,海南大學(xué)
時(shí)間:11月5日(周三)15:10
單位:北京大學(xué)物理學(xué)院
地點(diǎn):物理學(xué)院中212教室
摘要:
阿秒電子動(dòng)力學(xué)是強(qiáng)場原子分子物理領(lǐng)域的前沿研究方向,其核心在于揭示原子分子在強(qiáng)激光場中隧穿電離并產(chǎn)生阿秒電子動(dòng)力學(xué)過程的微觀機(jī)制。如何從中提取隨時(shí)間變化的時(shí)空阿秒動(dòng)力學(xué)信息成為核心科學(xué)問題。我們以費(fèi)曼路徑積分量子力學(xué)原理為基礎(chǔ),提出大規(guī)模電子軌道統(tǒng)計(jì)加權(quán)時(shí)間方法,用大量電子軌道描述電子波函數(shù),以統(tǒng)計(jì)電子軌道加權(quán)平均時(shí)間表征量子時(shí)間期望值,利用包含亞勢壘庫侖相互作用的量子軌跡的方法研究了強(qiáng)激光場激發(fā)下原子、分子的隧穿電離復(fù)數(shù)時(shí)間動(dòng)力學(xué)過程,揭示了光電離過程中亞壘勢相互作用對阿秒角度條紋測量及分子共振增強(qiáng)電離的影響。
報(bào)告人簡介:
楊瑋楓,二級教授,博士生導(dǎo)師,教育部長江學(xué)者特聘教授,全國優(yōu)秀博士論文獎(jiǎng)獲得者,海南省有突出貢獻(xiàn)的優(yōu)秀專家,海南省杰出人才,中國計(jì)算物理學(xué)會(huì)計(jì)算原子與分子物理專業(yè)委員會(huì)委員,海南省物理學(xué)類教學(xué)指導(dǎo)委員會(huì)主任委員,《光學(xué)學(xué)報(bào)(網(wǎng)絡(luò)版)》編委。長期從事強(qiáng)場原子分子物理和阿秒電子動(dòng)力學(xué)研究,提出了深度學(xué)習(xí)費(fèi)曼路徑積分強(qiáng)場動(dòng)力學(xué)方法、大規(guī)模電子軌道加權(quán)統(tǒng)計(jì)時(shí)間分析等方法。成果發(fā)表在PRL, Light:S&A等物理學(xué)光學(xué)重要期刊,在World Scientific出版社發(fā)表學(xué)術(shù)專著兩章,以第一完成人獲省部級自然科學(xué)二等獎(jiǎng)。主持國家自然科學(xué)基金重點(diǎn)/面上項(xiàng)目等。
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報(bào)告人: 陳瑜,西湖大學(xué)
時(shí)間:11月6日(周四)10:00
單位:中國科學(xué)院物理研究所
地點(diǎn):M253
摘要:
隨著電動(dòng)汽車及新型儲(chǔ)能產(chǎn)業(yè)的飛速發(fā)展,兼具高安全性和高能量密度優(yōu)勢的固態(tài)電池備受矚目。而實(shí)現(xiàn)該技術(shù)的一大關(guān)鍵在于離子在固體介質(zhì)中的快速輸運(yùn)。具有面心立方氧離子亞晶格的化合物是一類最常見的氧化物,但其通常受限于較低的鋰離子電導(dǎo)率。
本報(bào)告將首先介紹我們的核心設(shè)計(jì)策略,即通過在巖鹽結(jié)構(gòu)中引入超化學(xué)計(jì)量比的鋰離子,成功構(gòu)建亞穩(wěn)態(tài)的共面鋰離子局域構(gòu)型,從而解鎖了面心立方氧化物中的超快鋰離子傳導(dǎo)。進(jìn)一步地,通過結(jié)合從原子、晶胞到介觀尺度的多維度表征與相形成機(jī)制分析,我們深入解析了該體系的多尺度結(jié)構(gòu)特征,闡明了其對超化學(xué)計(jì)量鋰的穩(wěn)定機(jī)制及與離子電導(dǎo)率間的構(gòu)效關(guān)系。基于此,我們將此類材料的室溫鋰離子電導(dǎo)率優(yōu)化至1 mS/cm以上,并提出了普適性的材料設(shè)計(jì)策略。最后,我將探討過鋰巖鹽型材料在固態(tài)電池中的應(yīng)用前景,及其對固態(tài)離子導(dǎo)體材料設(shè)計(jì)的啟發(fā)意義。
報(bào)告人簡介:
陳瑜,西湖大學(xué)工學(xué)院助理教授,研究員,博士生導(dǎo)師。2018年本科畢業(yè)于中國科學(xué)技術(shù)大學(xué),獲材料化學(xué)理學(xué)學(xué)士學(xué)位。2023年獲得美國加州大學(xué)伯克利分校材料科學(xué)與工程博士學(xué)位,隨后在美國勞倫斯伯克利國家實(shí)驗(yàn)室電子顯微中心開展博士后研究。研究方向聚焦于無機(jī)全固態(tài)電池材料與固相離子輸運(yùn),并利用先進(jìn)電子顯微術(shù)實(shí)現(xiàn)能源材料的跨尺度表征。相關(guān)研究成果以第一作者或共同通訊作者發(fā)表在Nature Materials, Advanced Materials, ACS Energy Letters, Chemistry of Materials等期刊。曾獲得國家優(yōu)秀自費(fèi)留學(xué)生獎(jiǎng)學(xué)金,UC Berkeley Harry Stuart Derby and Alice Urquhart Derby Scholarship,郭沫若獎(jiǎng)學(xué)金等。
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報(bào)告人:Cedomir Petrovic , 上海前瞻物質(zhì)科學(xué)研究院
時(shí)間:11月6日(周四)14:00
單位:清華大學(xué)物理系
地點(diǎn):物理樓W105
摘要:
Since the times of Bernd Matthias, exploratory synthesis and characterization have been pushing the boundaries of physics in quantum materials. In my presentation, I will exemplify these using connections among crystal imperfections and observables of interest in Fe1-ySe1?xSx, FeSb2, magnetic and superconducting 2D van der Waals materials. Then, I will go over some notable examples such as CeCoIn5, MgB2, two- and three- dimensional Dirac semimetals. I will also illustrate technical development in metallic flux growth methods. This activity is the “tip of the spear” within the physics research enterprise, leading to not only collaborative discoveries of fundamental physics in in-house lab and large-scale facility environments but also to innovative detection of electronic properties directly related to device applications.
報(bào)告人簡介:
Cedomir Petrovic is a condensed matter physicist with focus on material synthesis. He received his PhD in 2000 from Florida State University and National High Magnetic Field Laboratory (NHMFL) in the United States. He worked in the Brookhaven National Laboratory (BNL) from 2002 till 2023. Since 2023, he joined Shanghai Advanced Research in Physical Sciences (SHARPS). He is currently also a visiting staff scientist of HPSATR Beijing, Scientist honorary of Vinca Institute of Nuclear Sciences in Belgrade, and adjunct professor in Stony Brook University. He is the APS Fellow (since 2016) and Foreign Associate Member of Serbian Academy of Sciences and Arts. He received several honors and awards, including the Humboldt Fellowship for Experienced Researchers (2011-2014), BNL Science and Technology Award (2022), and Oriental Pearl Talent Award (2024).
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報(bào)告人:Prof. Tomonori Ugajin,Rikkyo University
時(shí)間:11月6日(周四)15:10
單位:北京大學(xué)物理學(xué)院
地點(diǎn):物理西樓B105
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報(bào)告人:Ran Li,北京師范大學(xué)
時(shí)間:11月6日(周四)15:30
單位:北京大學(xué)物理學(xué)院
地點(diǎn):KIAA-auditorium
摘要:
The standard picture of cosmic structure formation rests on the cold dark matter (CDM) paradigm, in which structure grows hierarchically: small dark matter halos collapse first and later merge and accrete material to build larger systems. Galaxies form within these halos and co-evolve with their hosts. A direct consequence is the prediction of a vast population of low-mass halos in the present-day universe. Detecting them, however, is challenging. Beyond the Milky Way, strong gravitational lensing currently provides the only direct way to find such “l(fā)ittle dark dots,” by revealing their subtle perturbations to lensed images. In this talk, I will present the techniques and state of the art in precision lens modeling for subhalo and line-of-sight halo detection. I will also discuss the key systematics and how we control them. Finally, I will outline prospects in the JWST, CSST, and Euclid era, where high-resolution imaging and large, homogeneous samples will transform these measurements into stringent tests of CDM and alternative dark-matter scenarios.
報(bào)告人簡介:
Ran Li received his Ph.D. from Peking University in 2011. From 2011 to 2024 he worked at the National Astronomical Observatories, Chinese Academy of Sciences, serving as a postdoctoral researcher, associate researcher, and then researcher. Since 2024 he has been a Professor at the School of Physics and Astronomy, Beijing Normal University. His research interests include gravitational lensing, galaxy dynamics, and galaxy formation. Li has been involved in the Chinese Space Station Telescope (CSST) science program since 2010 and currently serves as the Responsible Scientist for Science Data at the Joint Center of Science for CSST . Beyond research, he writes for the public on science and is the author of Roaming the Universe.
封面圖片來源:http://www.iop.cas.cn/kxcb/kxtp/201310/t20131016_3956779.html
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