• HOME
  • >
  • 소식
  • >
  • 세미나

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 
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

회의 ID: 876 2332 4709

암호: 125958


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
394 2023-09-14 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] Dark matter searches in Water Cherenkov Detectors file
393 2018-05-11 14:30  E6-2. 1st fl. #1323  Disordered Floquet topological insulators file
392 2016-12-09 16:00  #1323(E6-2. 1st fl.  Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
391 2022-05-13 14:30  Zoom webinar  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
390 2021-07-29 14:00  Online seminar  Gravitationally Induced Dark Sector and Inflationary Dynamics file
389 2015-12-11 13:30  E6-2, #1323  Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
388 2016-03-11 13:30  E6-2. 1st fl. #1501  Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
387 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
386 2022-08-18 10:00  E6-1 #1323  Disorder-driven phase transition in the second-order non-Hermitian skin effect
385 2023-04-27 11:00  E6-2 #1322  Inverse Shapiro steps and coherent quantum phase slip in superconducting nanowires
384 2015-07-16 16:00  E6-2, 1318  Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
383 2018-10-26 16:00  #1323, E6-2  Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates file
382 2017-03-24 14:30  #1323 (1st fl. E6-2).  Topological Dynamics
381 2015-10-15 10:00  E6-2, 5th fl. #5318  Development of Large-Bore, High Field Magnets at the NHMFL
380 2023-06-22 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP Seminar] The muon g-2 puzzle file
379 2016-05-19 15:00  May 19, 2016 (Thur.) 3PM,  The CERN Resonant WISP Search: Development, Results and Lesson-Learned
378 2016-07-08 11:00  #1323(E6-2. 1st fl.)  Isostatic magnetism
377 2015-11-23 13:30  E6-2, #1323  What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
376 2017-02-01 14:00  #1323(E6-2. 1st fl.)  Quantum electron optics using flying electrons
375 2019-09-10 15:00  E6-2. 1st fl. #1323  Two-Stage Kondo Effect file