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Non-reciprocal phase transitions

2022.03.28 11:35

admin 조회 수:562

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
12 2009-09-07 16:00  E6, 1501  Physics Colloquium : 2009 Fall file
11 2009-02-23 16:00  E6, 1501  Physics Colloquium : 2009 Spring file
10 2022-02-28 16:00  E6, #1501  Spin-based training of optical microscopes
9 2023-11-15 16:00  E6-6, #119  Quantum hydrodynamic theory for plasmonics: from molecule-coupling to nonlinear optics
8 2023-04-04 16:00  Room 2501, KAIST Natural Sciences Lecture Hall(E6)  Chiral Magnetism: A Geometric Perspective
7 2023-09-18 11:00  E6-2, #1322  Magic polarisation trapping of polar molecules for tunable dipolar interactions file
6 2022-03-31 10:00  E6 #1501/zoom  Weiss fields for Quantum Spin Dynamics file
» 2022-03-29 10:00  E6 #1501/zoom, E6 #2502/zoom  Non-reciprocal phase transitions file
4 2019-09-02 16:00  Seminar Room 1501  Fall 2019: Physics Colloquium file
3 2019-09-18 16:00  Seminar Room #1323  Fall 2019: Physics Seminar Serises file
2 2019-03-21 16:00  RM. 1323, E6-2  Spring 2019: Physics Seminar Serises file
1 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file