報告人：葛韶鋒, Max Planck Institute for Nuclear Physics
時間： 7月25日（周一）10:00
單位：中國科學院高能物理研究所
地點：Theoretical Physics Division，319
Abstract: With the 1-3 mixing angle measured at reator neutrino experiments, Daya Bay and RENO, there are still three unknown oscillation variables, the neutrino mass hierarchy, the octant of the atmospheric mixing angle, and the leptonic CP phase. Of these three, the CP phase is the most difficult to measure precisely and important for distinguishing flavor symmetries. I will first talk about residual symmetries, which takes the role as low energy effective field theory for neutrino mixing and is analogy of custodial symmetry in the electroweak sector, to predict the CP phase from the measured mixing angles. Then I introduce a new type of neutrino experiment to measure the CP phase. Currently, T2K, NOvA, and DUNE are designed for CP measurement. Nevertheless, they suffer from problems of degeneracy, efficiency, uncertainty, non-unitary mixing and non-standard interaction. All of them can be improved by simply adding a muon decay at rest (muDAR) source to T2(H)K, for example. The same configuration can also apply to next-generation medium baseline reactor neutrino experiments like JUNO and RENO-50, enhancing their physics potential from only mass hierarchy to also CP. With only one source and no extra detectors, this dessign is much better than DAEdLAS which requires 3 sources, but only 20% duty factor and 4 times higher luminosity for each.
2Whispering Gallery Microcavity Sensing報告人：Tao Lu， Department of Electrical and Computer Engineering, University of Victoria, Canada
時間： 7月25日（周一）10:00
單位：北京大學
地點：物理樓中211
In the past decade, whispering gallery microcavities have been emerging as powerful tools for nanodetection and biosensing. This talk reviews experimental and numerical techniques for whispering gallery microcavity sensing. On the experiment side, an overview of sensing techniques such as reactive, mode splitting, active and plasmonic enhanced sensing along with the reference interferometric enhancement will be discussed. In particular, optomechanical sensing down to single molecule resolution will be presented in detail. On the numerical side, modelling techniques such as beam propagation, mode matching and boundary element methods and their applications to simulating wave propagating behavior in microcavities will also be discussed.
報告人：Li Zeng
時間： 7月25日（周一）12:00
單位：北京大學
地點：KIAA,first floor meeting room
This talk presents two works recently submitted to the Astrophysical Journal. One is on the scaling relation and a simple analytic model of Earth-like rocky planets. From it, the interior gravity, density, and pressure profiles of these planets are estimated and compared. The moment of inertia and energy contents of such planets are also evaluated. The other is on the variational (or action) principle of planetary interiors. From it, a general second-order differential equation applicable to all planetary interiors is obtained. Combined with equations of states (EOS), this equation derives (1) self-similar solutions for power-law EOS, which are equivalent to the Lane-Emden equation results known in astrophysics, (2) a universal mass-radius relation applicable to two-layer rocky planets with arbitrary core mass fraction (CMF), and (3) a new form and understanding of virial theorem. These two papers are available on astrozeng.com and ArXiv.org: 「A Simple Analytical Model for Rocky Planet Interior」. Li Zeng, and Stein Jacobsen. submitted to ApJ.
4An Introduction to ResBos Physics報告人：C.-P. Yuan，Michigan State University
時間： 7月25日（周一）15:00
單位：中國科學院理論物理研究所
地點：理論物理所新樓6620報告廳
I will briefly review physics included in the ResBos project which is to apply the Collins-Soper-Sterman qT resummation formalism to include the effect of multiple soft gluon radiation to the kinematic distributions of W/Z/H bosons and their decay particles produced in hadron-hadron collision.
5Top-philic Scalar Dark Matter with a Vector-like Fermionic Top Partner報告人：吳培文，韓國高等研究院 KIAS
時間： 7月25日（周一）16:00
單位：中國科學院理論物理研究所
地點：理論物理所新樓6620報告廳
We propose a simple extension of the Standard Model with a scalar top-philic dark matter coupling, apart from the Higgs portal, exclusively to the right-handed top quark $and a colored vector-like top partner with a Yukawa coupling which we call the topVL portal. Its phenomenology at the LHC and dark matter detections are studied in detail.
報告人：戴子高，南京大學
時間： 7月26日（周二）10:00
單位：中科院高能物理研究所
地點：主樓A415
快速射電暴是宇宙空間發生的持續時標只有幾毫秒的射電爆發現象。觀測揭示這種現象很可能產生於宇宙學距離上的與緻密星相關的劇烈過程。在報告中，首先簡單地介紹快速射電暴的觀測特性，接著綜述其能源模型，特別是介紹重複快速射電暴的脈衝星與小行星帶碰撞模型以及非重複快速射電暴的雙中子星併合模型，並討論快速射電暴與引力波暴和短伽瑪暴成協的可能性，最後展望我國未來FAST和HXMT觀測對於證認快速射電暴起源的重要性。
7Multiple Elliptic Fibrations and String Duality報告人：高昕，美國弗吉利亞理工大學
時間： 7月26日（周二）16:00
單位：北京師範大學
地點：科技樓A區311
We present an algorithmic to construct multiple fibration in Elliptic Calabi-Yau threefolds with section. We can perform Deligne procedure and Jacobian procedure to get the Weierstrass form and the associated 6D effective field theory for F-theory for arbitrary elliptic fibration Calabi-Yau threefolds. Then we analyze the shared F-theory duality in 6D through F/M-theory limit in 5D. In the same framework, we studied the Het/F-theory duality in 6D and 4D.
8Explore Strongly Correlated Electron Materials with Advanced IR and THz Spectroscopy報告人：Mengkun Liu
時間： 7月27日（周三）14:00
單位：北京大學
地點：北京大學物理樓，西563會議室
In strongly correlated electron materials (CEMs), the delicate interplay between spin, charge,and lattice degrees of freedom often leads to extremely rich phase diagrams exhibiting intrinsic phase inhomogeneities. The key to studying and disentangling such complexities usually lies in the characterization and control of these materials at fundamental energy, time and length scales. I will use this opportunity to report the recent advances in the IR and THz spectroscopy and explain how they can be used to probe electronic/structural phase transitions with unprecedented spatial and temporal resolutions. Specifically, with scanning near-field infrared microscopy we resolved the insulator to metal phase transitions with ~10 nm resolution over a broad spectral range. Using ultrafast terahertz pump terahertz probe spectroscopy we can unambiguously demonstrated the insulator to metal transition at picosecond time scales via electric field-induced electron liberation. These results set the stage for future spectroscopic investigations to access the fundamental properties of complex materials.
9Comparative studies of pseudogap physics in Charge Density Wave (CDW) materials and cuprate High Temperature Superconductors (HTSCs)報告人：Utpal Chatterjee，University of Virginia (UVA)
時間： 7月27日（周三）14:00
單位：中國科學院物理研究所
地點：物理所M樓253會議室
Charge density waves (CDWs) and superconductivity are canonical examples of symmetry breaking in materials. Both are characterized by a complex order parameter – namely an amplitude and a phase. In the limit of weak coupling and in the absence of disorder, the formation of pairs (electron-electron for superconductivity, electron-hole for CDWs) and the establishment of macroscopic phase coherence both occur at the transition temperature Tc that marks the onset of long-range order. But, the situation may be drastically different at strong coupling or in the presence of disorder. We have performed extensive experimental investigations on pristine and intercalated samples of 2H-NbSe2, a transition metal dichalcogenide CDW material with strong electron-phonon coupling, using a combination of structural (X-ray), spectroscopic (photoemission and tunnelling) and transport probes. We find that Tc(d) is suppressed as a function of the intercalation-concentration d and eventually vanishes at a critical value of d=dc leading to quantum phase transition (QPT). Our integrated approach provides clear signatures that the phase of the order parameter becomes incoherent at the quantum/ thermal phase transition, although the amplitude remains finite over an extensive region above Tc or beyond dc. This leads to the persistence of a gap in the electronic spectra in the absence of long-range order, a phenomenon strikingly similar to the so-called pseudogap in completely different systems such as high temperature superconductors, disordered superconducting thin films and cold atoms.
10Transport of water substance into the stratosphere by deep convective storms報告人：王寶貫
時間： 7月27日（周三）15:00
單位：北京大學
地點：物理樓北547
11紀念唐山大地震四十周年: 地震原理新論-兼駁地震不可預測論報告人：陸坤權，中科院物理研究所
時間： 7月27日（周三）15:45
單位：中科院理論物理研究所
地點：理論物理所322報告廳
實現地震的科學預測，必須了解：（1）地震能量積累過程以及地震前兆形成和傳播原理；（2）地震發生的物理機制。基於固體連續介質原理的傳統地震學，對於這些問題或沒有認識，或觀點不正確。是由於對物理原理及其適用範圍理解的偏差，同時沒有運用新發展的物理學知識。我們依據地殼和地幔離散構造及其慢動力學變化過程基本事實，運用近年凝聚態物理學發展的新觀念和原理，從新的視角對地震機理進行了深入探討，獲得了與傳統觀點不同的新認識，可回答以前不能理解的許多地震學問題，並指出了地震預測原理和途徑。國際地震界普遍認為地震不可預測，還源於對地震原理沒有正確認識和對「自組織臨界性（SOC）」的誤解。
報告人：何濟洲，南昌大學
時間： 7月28日（周四）15:30
單位：北京師範大學
地點：科技樓A區311
介紹三端結構熱電器件的類型、熱力學理論、效率界限。具體研究由兩個單能級量子點分別與兩電子庫耦合而構成的混合驅動熱電器件的工作區間、性能特徵和優化理論。考慮非輻射效應（非理想）的情況下，應用主方程描述電子在傳輸過程中的動力學特性, 導出了混合驅動制冷機的製冷率和製冷係數，得到了其性能特徵曲線和優化性能曲線。
13Strongly Correlated Majorana Transistors報告人：Fan Zhang，University of Texas at Dallas
時間： 7月28日（周四）16:00
單位：北京大學
地點：北京大學物理樓，西563會議室
We are witnessing and participating the grand discovery of various topological states of matter. In this talk, I will introduce time-reversal-invariant topological superconductivity and its two experimental realizations in one dimension. Each boundary hosts one Majorana Kramers pair, producing tabletop supersymmetry, quantized tunneling conductance, and fractional Josephson effects beyond Kitaev’s classification. I will then highlight the tantalizing roles played by the many-body interactions. One prime example is the emergence of quadruple periodicity and fractionalized parafermions in a Josephson junction. Another paradigmatic setup is a weakly probed floating topological superconductor, in which a two-channel Kondo ground state becomes topologically stabilized.
14Electronic and Chemical nano-imaging of wonder materials beyond graphene報告人：Synchrotron SOLEIL, University Paris-Saclay
時間： 7月29日（周五）10:00
單位：清華大學
地點：物理系三樓報告廳（理科樓C302）
Recently, great progress has been made as a result of the rapid expansion in the range of modern microscopies. However, even if they have achieved remarkable, the problem still remains of providing powerful high-resolution spectroscopic tools for probing at a mesoscopic-scale. For such a result, the characterization of the electronic structure directly responsible for chemical bonds, electrical transport and the thermal and mechanical properties should be accurately accomplished. Hence, not only the study of core levels and chemical shifts should be resolved but also and more importantly, a complete and comprehensive description of the electronic bandstructure with high lateral, energy and momentum resolution should be fulfilled. Bearing in mind this need, we have recently developed a novel X-ray microscope, labeled, k-microscope or Nano-ARPES (Nano Angle Resolved Photoelectron Spectroscopy) at the ANTARES beamline of SOLEIL, particularly well suited to provide both chemical and electronic information in the real and reciprocal space of mesoscopic and nano-samples. It is a cutting-edge technique able of determining the electronic properties of the materils, not only with high resolution in energy, angle and momentum, but also with high lateral resolution, at the nano- and meso-scale. In this presentation, the latest published and unpublished results of the ANTARES k-microscope will be disclosed.