報告人：沈元壤，中國科學院外籍院士
時間：6月7日（週四）18:30
單位：中國科學院大學
地點：雁棲湖校區教1-107
水是生命之源，地球上最重要的液體。儘管我們自古便研究水，但對水認知甚少。報告中沈元壤院士將為我們介紹目前研究水和冰所面臨的諸多難題。
報告人：Martha Greenblatt， State University of New Jersey
時間：6月5日（週二）10:00
單位：中科院物理所
地點：M樓236報告廳
Martha Greenblatt is Board of Governors Professor of Chemistry in the Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey. She received her B.Sc. from Brooklyn College in Chemistry in 1962 and her Ph.D. in Inorganic Chemistry, in 1967 from the Polytechnic Institute, Brooklyn, NY. Greenblatt’s research is focused on solid state inorganic chemistry; synthesis and crystal growth of novel transition metal compounds with quasi-low-dimensional, correlated electronic properties. Another area of research pursued by her was fast ionic (H+, Li+ and O2-) motion in solids, both in crystalline and amorphous materials for applications in solid-state batteries, fuel cells and sensors. She has ~ 500 publications in refereed journals. Her contributions have been recognized by the Francis P. Garvan-John M. Olin Medal 2003, sponsored by Francis P. Garvan-John M. Olin Medal Endowment-National Award by the American Chemical Society for major contribution to the field by a woman chemist. She was Editor-in-Chief of the Materials Research Bulletin, 2000 - 2014. She is on the Editorial Board of several materials journals: Journal of Solid State Chemistry, Member of the Editorial Advisory Board 1989-present; Chemistry of Materials, Advisory Board, 1991-1997; Materials Research Bulletin, Editorial Advisory Board, 1995-2000; Materials Science and Engineering B-solid state materials for advanced engineering, Associate Editor, 1991-1997; Inorganic Chemistry, Member of the Editorial Board, 1993-1996.
報告人：David Kosower，Peng Huanwu Visiting Professor
時間：6月5日（週二）10:30
單位：中科院理論所
地點：ITP New Building 6620
In this talk, I present recent work on solving integration-by-parts (IBP) systems for simplifying Feynman integrals. I'll give a brief review of IBP, and also review the idea of generating vectors which block-diagonalize IBP systems. I then present recent work on conjugate polynomials, which fully diagonalize such systems. I also present an application to generating recurrence relations for arbitrary powers of irreducible numerators in Feynman integrals.
報告人：張湘義，燕山大學
時間：6月5日（週二）14:00
單位：北京師範大學
地點：物理樓106
Hybrid nanomaterials made up of two or more functional components have recently attracted extensive attention in the academic community, owing to their enhanced or novel multifunctional properties. However, hybrid nanostructures that make strong permanent magnets are difficult to devise, because it is challenging to precisely control 3D complex structures at the nanoscale, especially for aligning nanocrystals with their easy magnetization axes along a certain direction. More recently, we have made significant advances in designing 3D hybrid nanostructure in a well-controlled way, through developing new fabrication theory and technologies. The resulting bulk nanostructures that consist of hard and soft-magnetic crystals exhibit an unprecedented high energy product for this class of hybrid materials, with high fractions of soft-magnetic phase, and outperform their corresponding pure permanent magnet for the first time. These findings open up new opportunities for creating stronger permanent magnets with less rare earths.
報告人：Anand Yethiraj，Memorial University of Newfoundland
時間：6月5日（週二）15:30
單位：中科院物理所
地點：D樓210會議室
Self-assembly close to equilibrium is very well studied. Yet, many challenges remain in achieving controllable microscale structures. Increasingly it is realized that driven systems that are from from equilibrium, while far more difficult to have an intuition for, might yield surprises in the control of structures. In a series of experiments, we have explored in depth a simple oil-in-oil emulsion where an external electric field can drive a rich variety of tunabilty, i.e., frequency-controlled hydrodynamics, that yields different dynamical regimes and structures, all controlled by super-diffusive motions in the underlying fluid.
報告人：Lin Tian, School of Natural Sciences, University of California
時間：6月6日（週三）10:00
單位：清華大學
地點：理科樓C302報告廳
Adiabatic quantum computing is a quantum computing prototype that provides powerful insights to optimization problems and the generation of novel quantum states. A central challenge in the successful implementation of adiabatic quantum algorithms is to maintain quantum adiabaticity and keep the system in its ground state during the evolution. However, quantum adiabaticity can be vulnerable in interacting many-body systems with small energy gaps, where diabatic transitions out of the ground state can occur. Despite intensive efforts towards preserving quantum adiabaticity, an implementable method has yet to be developed. Here we present a universal and implementable approach to enhancing the quantum adiabaticity in a cavity QED scheme. Our numerical simulation on several models, including a NP-complete problem, confirms our theoretical result. This approach does not require the spectral knowledge of the adiabatic quantum computer or the construction of unphysical interactions.
報告人：張宏，Munich Tech Univ
時間：6月6日（週三）14:00
單位：北京師範大學
地點：物理樓105
To solve the cusp-core problem, self-interacting dark matter (SIDM) and Axion-like particles (ALPs) are the two most popular directions nowadays. In this talk, I will explain how a low-energy effective field theory (EFT) can help to constrain the properties of SIDM. As an example, we have set up such a Zero-Range EFT (ZREFT) for SU(2)-triplet wino and have shown its agreement with the full theory at low energy. For ALPs, I will introduce the fascinating phenomenon that these ALPs form Bose-Einstein Condensate (BEC) under gravity. The size of the ALP BEC varies from the size of an asteroid to the size of a galactic halo, depending on the mass of ALP. I will focus on the dense BEC configuration we have proposed recently.
8Majorana physics in spin space: from detecting to braiding
報告人：Xin Liu
時間：6月6日（週三）16:00
單位：北京大學
地點：Room W563, Physics Building
Quantum states of electronic systems inevitably have the internal degree of freedom, the spin, so do the Majorana zero modes (MZMs). In this talk, I will discuss how to utilize the spin degree of freedom to manipulate, braid, and detect Majorana modes. After a brief introduction to the conventional schemes of detecting and braiding MZMs, we show that such schemes have counterparts based on spin manipulation. For detecting MZMs utilizing their spin-triplet nature, we find an electric field driven DC supercurrent which is dual to the celebrated flux driven Josephson effect. This phenomenon can be combined with zero bias peak in the same device and give strong evidence of the existence of MZMs. For braiding MZMs utilizing their fully spin polarized character, we propose to braid MZMs by locally winding the Majorana spins, which topologically corresponds to twisting two associated worldribbons, equivalent to worldlines that track the braiding history of MZMs. The braiding operati
on by winding Majorana spins is robust against local imperfections such as irregular winding paths, the static and dynamical disorder effects, which is a natural consequence of the intrinsic connection of our scheme to topological charge pumping.
報告人：唐靖宇
時間：6月6日（週三）18:30
單位：中國科學院大學
地點：雁棲湖校區教1-113
報告人：Zheng Cai，Univ. of California, Santa Cruz and THCA
時間：6月7日（週四）14:00
單位：清華大學
地點：蒙民偉科技南樓S727
Understanding the relationship between the Inter-Galactic Medium (IGM) and galaxies is one of the next big frontiers in studying of the galaxy formation and cosmology. In this talk, I will present a survey of the most massive overdensities of galaxies in the peak of cosmic star formation and QSO activities (z=2--4). These structures are traced by the strongest intergalactic Hi (Lyman-alpha) absorption on large scales of 10-30 Mpc. I will present the survey of the extremely massive overdensities at z~2.3 traced by these IGM Lya absorption using Keck, LBT, KPNO-4m, and CFHT. Further, I will discuss the discovery of largest and most luminous Lyman alpha nebulae in these fields, which are unique laboratories to study the IGM-galaxy interactions. Then, I will present our newest observations of these Lyman alpha nebulae using Keck and Palomar Cosmic Web Imager (CWI) and possible evolution of the QSO CGM from z=3 to z=2. In the end, I will talk about the future prospects and highlight a few projects.
報告人：張遠波， 復旦大學
時間：6月7日（週四）16:00
單位：清華大學
地點：理科樓鄭裕彤講堂
Two-dimensional (2D) atomic crystals, best exemplified by graphene, have emerged as a new class of material that may impact future science and technology. From a material physicist’s point of view, 2D materials provides vast opportunities on two fronts: First, the reduced dimensionality in these 2D crystals often leads to novel material properties that are different from those in the bulk; Second, the entire 2D crystal is a surface, so it is possible to have better control of their material properties with external perturbations. In this talk I will first illustrate these two points with two examples: black phosphorus and 1T-TaS2. These two layered materials have vastly different properties. Black phosphorus is a 2D semiconductor, and its superior material quality has recently enabled us to observe the quantum Hall effect. 1T-TaS2, on the other hand, is a metal with a rich set of charge density wave phases; we explore their electronic properties while the doping and dimensionality of the 2D systems are modulated. I will then discuss our recent results on 2D ferromagnet and high Tc superconductors.
報告人：劉瑜
時間：6月8日（週五）16:00
單位：北京航空航天大學
地點：主樓513小會議室
報告人：Moses Hung-Wai Chan
時間：6月9日（週六）19:00
單位：中國科學院大學
地點：國際會議中心一層報告廳
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