1
報告人:齊志,北京大學
時間:6月10日(周二)16:00
單位:中國科學院理論物理研究所
地點:北樓202
2
報告人:王凱,浙江大學
時間:6月11日(周三)15:00
單位:中國科學院理論物理研究所
地點:北樓CCAST五樓報告廳
摘要:
工程是一個圍繞確定目標通過有組織活動實現(xiàn)人造產(chǎn)品的過程,而物理作為最典型的自然科學,以探索人類未知為驅(qū)動,研究物質(zhì)一般運動規(guī)律和基本結(jié)構(gòu)。從1938年底核裂變現(xiàn)象的發(fā)現(xiàn)到1942年核反應(yīng)堆實現(xiàn)臨界和1945年原子彈爆炸成功,人類科學史上第一次在如此短的時間內(nèi)實現(xiàn)了從基礎(chǔ)科學到工程應(yīng)用的轉(zhuǎn)變,展現(xiàn)了一個典型的工程科學的路徑。報告將從核物理的發(fā)展,介紹核反應(yīng)堆到原子彈、氫彈的基本物理原理和發(fā)展歷史。特別是我國一批從事基礎(chǔ)物理學研究的科學家,轉(zhuǎn)行進入核武器這個當年的“卡脖子”領(lǐng)域,從源頭和底層出發(fā),快速突破實現(xiàn)了跨越式發(fā)展,不僅快速實現(xiàn)了原子彈,還比現(xiàn)代核物理發(fā)祥地法國早一年實現(xiàn)了氫彈的突破。我國的核武器發(fā)展歷史說明不能將核武器簡單地視為工程技術(shù)問題,而要當成科學問題來展開研究,知其然知其所以然,進一步展現(xiàn)了工程物理的研究路徑。
報告人簡介:
王 凱,浙江大學物理學院教授,中國核學會輻射物理分會常務(wù)理事《中國科學-物理力學天文》編委,長期從事理論物理研究,特別是粒子物理理論和高能量密度物理理論,主編教育部101計劃教材《近代物理導(dǎo)論》。
3
報告人:Long-Qing Chen,The Pennsylvania State University, USA
時間:6月12日(周四)9:00
單位:Microstructures期刊
鏈接:
報告人簡介:
Long-Qing Chen is Hamer Professor of Materials Science and Engineering at Penn State. He received his Ph.D. from MIT, M.S. from Stony Brook University, and B.S. from Zhejiang University. His main research interests include thermodynamic theory and computational model development for understanding solid phase transitions and microstructure development. His research awards include the Materials Research Society (MRS) Materials Theory Award, The Minerals, Metals & Materials Society (TMS) John Bardeen Award, American Ceramic Society (ACerS) Ross Coffin Purdy Award, TMS Cyril Stanley Smith Award, TMS William Hume-Rothery Award, The American Society of Metals (ASM) International Silver Medal, and IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society (IEEE-UFFC-S) Distinguished Lecture Award. He is a Guggenheim Fellow, a Humboldt Research Awardee, a Foreign Member of Academy of Europe (Academia of Europaea, MAE), and a member of the US National Academy of Engineering (NAE).
4
報告人:Sudipta Sarkar,IIT Gandhinagar, India
時間:6月12日(周四)10:30
單位:中國科學院理論物理研究所
地點:北樓322
Zoom Meeting ID: 893 2377 7487
Passcode: 524849
摘要:
The Einstein-Hilbert action represents the simplest generally covariant formulation of gravity. Despite the success of Einstein'?s field equations across a wide range of scales, theoretical motivations, including insights from quantum gravity, string theory, and effective field theory suggest that the classical theory may be incomplete. These considerations naturally lead to the inclusion of higher curvature invariants as corrections to the Einstein-Hilbert action. In this seminar, I will provide an overview of the rationale behind such modifications and examine their physical implications. Particular emphasis will be placed on the challenges posed by higher curvature terms, including potential violations of causality and issues of classical and quantum stability. The goal is to assess the viability of these extended theories and their prospects for providing a consistent extension of general relativity.
報告人簡介:
Sudipta Sarkar is a Professor of Physics at the Indian Institute of Technology (IIT) Gandhinagar, India. He obtained his Ph.D. from the Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, and subsequently conducted postdoctoral research at the University of Maryland, USA. His research interests lie primarily in gravitation, gravitational waves, and black hole physics. He is visiting the Institute of Theoretical Physics as a Peng Huanwu Visiting Professor.
5
報告人:張嘯天,中國科學院大學卡弗里理論科學研究所
時間:6月12日(周四)14:00
單位:中國科學院物理研究所
地點:懷柔園區(qū)X1南樓101會議室
騰訊會議:226-676-255
會議密碼:2025
摘要:
Strange metals are ubiquitously observed in a variety of strongly correlated materials, among which high temperature cuprates, ruthenate oxides, and twisted bilayer graphene are the most prominent examples. In these materials, the critical quantum fluctuations are often accompanied by the Lifshitz transition of the Fermi surface where the Fermi surface exhibits van Hove singularity (VHS) and its geometry changes from convex to concave. In this talk, we address the nature of such an extreme correlated matter when both the VHS and wild quantum critical fluctuations are entangled. We adopt the Yukawa-SYK model with a spatially uniform Yukawa interaction and self-consistently solve for the low-energy effect theory which yields non-Fermi liquid states at distinct energy scales. Furthermore, we clarify the electron scattering mechanism at the Lifshitz transition and evaluate the optical conductivity and dc-resistivity by means of diagrammatic expansion. We demonstrate a linear-in-ω optical conductivity at T=0 and, more importantly, the strange metal behavior with a linear-in-T dc-resistivity in the entire quantum critical regime extending down to T→0. At higher temperatures, it eventually gives in to a non-universal scaling. In addition, we also consider the spatially random Yukawa interaction which gives rise to linear-in-T resistivity extending even into the non-universal high-T regime. Finally, we argue that our theoretical scheme for the strange metal is free from the severe short-circuit issue.
If time allows, we will briefly mention another line of development which forges an emerging interdisciplinary field between spintronics and strongly correlated matters. To set an example, we study the spin pumping effect without well-defined quasiparticles.
報告人簡介:
Xiao-Tian Zhang earned his bachelor’s degree from the College for Gifted Youngs at the University of Science and Technology of China in 2013. He then pursued his PhD at the International Center for Quantum Materials, Peking University, under the supervision of Prof. Ryuichi Shindou, graduating in 2019. From 2019 to 2022, he worked as a postdoc in Prof. Gang Chen’s group at the University of Hong Kong. In 2022, he joined the Kavli Institute for Theoretical Sciences as a Postdoctoral Fellow in collaboration with Prof. Fu-Chun Zhang and Special Research Assistant of UCAS (a.k.a. Assistant Researcher).
6
報告人:Zhiyu Zhang,NJU
時間:6月12日(周四)15:30
單位:北京大學物理學院
地點: KIAA-auditorium
摘要:
Elemental abundance and their ratios along the Galactocentric radius provide key information about the chemical evolution of the Milky Way. The 12C/13C ratio, in particular, is widely adopted as a proxy to infer other isotopic ratios, such as 16O/18O and 14N/15N. Traditionally, emission lines of 12CN and 13CN – with their optical depths corrected based on their hyper-fine structure lines – have traditionally been exploited to measure 12C/13C isotopic ratios. However, such a method has major pitfalls, with oversimplified (and overlooked) assumptions in both theory and observational interpretations. The optically-thin satellite-lines of 12CN and 13CN transitions present the advantages over the 'classical method', but still suffers bias from non-trivial effects from non-Local Thermal Equilibrium conditions. Our new measurements of 13C18O and C18O emission lines provide a promising new avenue for isotopic ratio determinations. With it, we further obtained the virial states of low-metallicity molecular clouds in the outer Galactic disk. Our analysis shows that the turbulent kinetic energy cannot support self-gravitational energy in these clouds, suggesting that the magnetic field likely play a dominant role in supporting clouds in such conditions.
報告人簡介:
Zhiyu Zhang is a faculty member at the School of Astronomy and Space Science, Nanjing University, specializing in observational radio astronomy. His research interests include the multiphase interstellar medium, astrochemistry, the stellar initial mass function, and the chemical evolution of galaxies. He earned his Master's and PhD degrees from Purple Mountain Observatory, with part of his doctoral research conducted at the Max Planck Institute for Radio Astronomy in Germany. From 2014, he held postdoctoral positions at the University of Edinburgh and the European Southern Observatory. He has been serving as a professor at Nanjing University since 2019.
7
報告人:李昺,中國科學院金屬研究所
時間:6月13日(周五)15:00
單位:中國科學院理論物理研究所
地點:北樓202
8
報告人:李強,北京大學
時間:6月13日(周五)15:40
單位:中國科大離子科學與技術(shù)研究中心、基本粒子和相互作用協(xié)同創(chuàng)新中心、核探測與核電子學國家重點實驗室
鏈接:
摘要:
Scientists from the Chinese LHC ATLAS and CMS groups have made substantial contributions to the construction, operation/maintenance and upgrade of the ATLAS/CMS detector, as well as in Higgs boson discovery, SM tests and BSM searches. Our projects in next years include continuing exploring physics of the electroweak symmetry breaking, precision test of the SM, and searching for possible BSM. These projects are crucial goals of the LHC experiment. We plan also to extend our scope to cover novel topics, such as 2 to 3 Vector boson scattering, advanced jet tagging for boosted bosons, and Quantum entanglement studies with bosons, etc. In addition, by interfacing CMS’s muon detectors with muon beams or cosmic rays, we propose here a set of new methods involving probing and knocking with muons (PKMu). There is a wealth of rich physics to explore, for example, 1?10 GeV muons scattering off electrons in target materials have a center-of-mass energy near 10 MeV, which makes them highly sensitive to dark bosons in the MeV mass range.
報告人簡介:
李強,北京大學物理學院博雅特聘教授,技術(shù)物理系副系主任,2023年國家杰出青年基金獲得者。長期致力于大型強子對撞機CMS實驗上的多玻色子物理研究,在多玻色子物理研究領(lǐng)域取得一批重要進展,包括通過多玻色子探針對標準模型精確測量、挖掘稀有標準模型過程以及利用人工智能方法鑒別玻色子噴注并應(yīng)用于多玻色子共振態(tài)尋找等。近年來也致力于未來對撞機和繆子打靶實驗的軟件和物理研究,獲得2021年度基金委原創(chuàng)探索基金項目支持。先后擔任CMS物理產(chǎn)生子組及計算軟件組二級召集人,自2023年起擔任CMS合作委員會顧問委員、School委員會委員。受邀在輕子光子會議、ICFA seminar等國際會議作大會報告介紹電弱物理,擔任ICHEP2024會議電弱及頂夸克分會召集人。指導(dǎo)的博士生肖杰、李聰喬先后獲得中國物理學會高能物理分會第十二屆和第十三屆“晨光杯”青年優(yōu)秀論文一等獎。
9
報告人:唐原江,清華大學
時間:6月16日(下周一)10:00
單位:中國科學院物理研究所
地點:北樓CCAST五樓報告廳
摘要:
磁場精密測量是精密測量領(lǐng)域的重要發(fā)展方向,其中基于熱原子系綜的原子磁力計已經(jīng)成為最靈敏的磁場探測器之一,廣泛應(yīng)用于生物醫(yī)學和前沿物理研究等領(lǐng)域。本報告將介紹在熱原子系綜中引入反饋調(diào)控手段,構(gòu)造宇稱-時間(PT)對稱系統(tǒng)和非線性相互作用系統(tǒng),并利用其特性研究磁場精密測量的新方法。同時還將介紹在熱原子非線性系統(tǒng)探索過程中發(fā)現(xiàn)的時間晶體現(xiàn)象,以及我們提出并驗證的時間晶體產(chǎn)生機制。
報告人簡介:
唐原江博士分別于2019年獲得復(fù)旦大學學士學位,2024年獲得清華大學博士學位,現(xiàn)為清華大學物理系博士后,合作導(dǎo)師為尤力教授。博士期間主要從事基于熱原子系綜的量子精密測量,至今已在物理學重要期刊發(fā)表論文8篇(其中PRL文章3篇),目前研究興趣為里德堡原子陣列研究。2024年至今,主持中國博士后創(chuàng)新人才支持計劃。
封面圖片來源:https://www.ciqtek.com/products/detail/QDM.html?id=cbe747d6-3d2d-457f-8992-ee4f20116b50
更多報告信息:
《物理》50年精選文章
特別聲明:以上內(nèi)容(如有圖片或視頻亦包括在內(nèi))為自媒體平臺“網(wǎng)易號”用戶上傳并發(fā)布,本平臺僅提供信息存儲服務(wù)。
Notice: The content above (including the pictures and videos if any) is uploaded and posted by a user of NetEase Hao, which is a social media platform and only provides information storage services.