中關村論壇 400
題目: Emergent space-time from a quantum phase transition
時間: 2022年08月29日 14:00
地點: 直播
報告人: 葉錦武 教授

Mississippi State university/Westlake university

直播鏈接:http://as-conf.iphy.ac.cn/liveRoomsMobile?lid=70

報告人簡介:

Prof. Ye received his Ph.D. from Yale University. Now he is a Professor at Mississippi state university. He has been a long term visitor at the Institute for Theoretical Sciences, Westlake University since last Fall. Prof. Ye's research covers wide areas of theoretical physics such as condensed matter theory quantum optics, cold atom physics and non-relativistic quantum field theory. Recently, he mainly focuses on the emergent quantum and topological phenomena of interacting electrons, spins and photons, also extends to conformal field theory, gravity and quantum black holes from materials point of views. 

報告摘要:

P.W. Anderson said " More is different ". It says the macroscopic quantum phenomena such as superfluids, superconductors, quantum anti-ferromagnetism, fractional quantum Hall states, etc emerge as the number of interacting particles gets more and more. However, he left the question how these emergent quantum or topological phenomena change under different inertial frames. In this talk, we try to address this outstanding problem. We propose there is an emergent space-time corresponding to any emergent quantum phenomenon, especially near a quantum/topological phase transition (QPT).  We explore the emergent space-time in one of the simplest QPTs:  Superfluid (SF)-Mott transitions of interacting bosons in a square lattice. By both constructing effective actions and performing microscopic calculations on a lattice, we show that a Mott phase near the QPT may tune into a SF phase, but not the other way around.  We also demonstrate many other novel effects of observing emergent quantum phenomena in a different inertial frame.  Contrast to the Doppler shifts in a relativistic quantum field theory and Unruh effects in an accelerating observer are made.  Doing various light or neutron scattering measurements in a moving sample may become an effective way not only measure various intrinsic properties of the materials, tune various quantum and topological phases through novel phase transitions, but also probe the new emergent space-time structure near any QPT.

邀請人:劉伍明(8264 9249)

聯系人:胡    穎(8264 9361)