visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Non-reciprocal phase transitions

2022.03.28 11:35

admin 조회 수:697

날짜 2022-03-29 10:00 
일시 10AM, 29th Mar. / 13:30 PM, 30th Mar. 
장소 E6 #1501/zoom, E6 #2502/zoom 
연사 Dr. RYO HANAI (APCTP) 
Title: Non-reciprocal phase transitions
presenter Dr. RYO HANAI (APCTP) 
Date: 10AM, 29th Mar. E6 #1501/zoom
        13:30 PM, 30th Mar. E6 #2502/zoom  
 

https://us02web.zoom.us/j/87623324709?pwd=TElFeTZZT2xCZnZ1azV5OEg4N1BjUT09

회의 ID: 876 2332 4709

암호: 125958

 
abstract

Phase transitions are ubiquitous in nature. For equilibrium cases, the celebrated Landau theory has provided great success in describing these phenomena on general grounds. Even for nonequilibrium transitions such as optical bistability, flocking transition, and directed percolation, one can often define Landau’s free energy in a phenomenological way to successfully describe the transition at a meanfield level. In such cases, the nonequilibrium effect is present only through the noise-activated spatial-temporal fluctuations that break the fluctuation-dissipation theorem. Here, by generalizing the Ginzburg-Landau theory to be applicable to driven systems, we introduce a novel class of nonequilibrium phase transitions [1-2] and critical phenomena [3] that does not fall into this class. Remarkably, the discovered phase transition is controlled by spectral singularity called the exceptional points that can only occur by breaking the detailed balance and therefore has no equilibrium counterparts. The emergent collective phenomena range from active time (quasi)crystals to exceptional point enforced pattern formation, hysteresis, to anomalous critical phenomena that exhibit anomalously large phase fluctuations (that diverge at d≤4) and enhanced many-body effects (that become relevant at d<8) [3]. The inherent ingredient to these is the non-reciprocal coupling between the collective modes that arise due to the drive and dissipation.

[1]  M. Fruchart*, R. Hanai*, P. B. Littlewood, and V. Vitelli, Non-reciprocal phase transitions. Nature 592, 363 (2021).

[2]  R. Hanai, A. Edelman, Y. Ohashi, and P. B. Littlewood, Non-Hermitian phase transition from a polariton Bose-Einstein condensate to a photon laser. Phys. Rev. Lett. 122, 185301 (2019).

[3]  R. Hanai and P. B. Littlewood, Critical fluctuations at a many-body exceptional point. Phys. Rev. Res. 2, 033018 (2020).
 
번호 날짜 장소 제목
245 2019-07-31 16:00  E6-2, #1323  Features of ballistic superconducting graphene file
244 2019-06-24 11:00  E6-2, #1323  Topological photonic anomalies file
243 2015-12-09 14:00  E6-2, #1323  SWELLABLE COLLOIDAL PARTICLES ARE SWELL
242 2015-12-02 16:00  E6-2, #1323  Samarium Hexaboride: Is it a Topological insulator?
241 2015-12-11 15:45  E6-2, #1323  Dynamical mean field theory studies on heavy fermion system
240 2015-12-01 16:00  E6-2, #1323  Introducing extra dimensions to spectroscopic studies of advanced quantum materials
239 2016-01-26 14:00  E6-2, #1323  Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data
238 2019-07-25 16:00  E6-2, #1323  Band topology of twisted bilayer graphene file
237 2015-08-03 10:30  E6-2, #1323 (Seminar Room)  Axion Search
236 2024-05-28 10:00  E6-2, #2501  Mixed-State Quantum Spin Liquids and Dynamical Anyon Condensations in Kitaev Lindbladians
235 2024-05-28 11:00  E6-2, #2501  동적평균장 이론 소개
234 2024-05-30 10:00  E6-2, #2501  Quasiperiodic Effects in Quasicrystals
233 2023-05-31 16:00  E6-2, #2502  [High-Energy Theory Seminar] Resurgence and complex Chern-Simons theory
232 2023-09-13 16:00  E6-2, #2502  [High Energy Theory Seminar] Cosmic Birefringence from Dark Photon
231 2024-05-14 16:00  E6-2, #2502  [High Energy Theory Seminar] Minimal Production of Prompt Gravitational Waves during Reheating.
230 2023-04-05 16:00  E6-2, #2502  [High Energy Theory Seminar]Anomalies of Discrete 1-Form Symmetries in QCD-like Theories
229 2024-05-29 16:00  E6-2, #2502  [High Energy Theory Seminar] Amplitudes Meet Cosmology: From Inflation to the Large-Scale Structure
228 2023-11-22 16:00  E6-2, #2502  [High Energy Theory Seminar] Renormalization and the Hierarchy Problem
227 2023-10-04 16:00  E6-2, #2502  [High-Energy Theory Seminar] Moving towards quantum technologies: the case of quantum batteries
226 2023-05-03 16:00  E6-2, #2502  Probing microscopic origins of axions by the chiral magnetic effect