visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Non-reciprocal phase transitions

2022.03.28 11:35

admin 조회 수:5276

날짜 2022-03-29 10:00 
연사  
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  
 

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 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
314 2020-10-16 14:30    Nanoscale magnetic resonance detection towards nano MRI file
313 2020-10-16 16:00    Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
312 2020-10-23 14:00    Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime file
311 2020-11-12 16:00    2020 가을학기 광학분야 특별세미나
310 2020-11-17 12:00    Quantum- & Nano-Photonics" 세미나 시리즈 file
309 2020-11-20 14:30    Lumpy Cooper pairs in an iron-based superconductor
308 2020-11-20 16:00    Coherent control of field gradient induced quantum dot spin qubits
307 2020-11-26 16:00    2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit)
306 2020-12-02 10:00    Recent progress in Axion Dark Matter eXperiment (ADMX) technology file
305 2020-12-09 10:00    Searching for the QCD axion with the ARIADNE experiment file
304 2020-12-10 13:55    Consistency of Boltzmann equation and light dark matter from inflaton decay
303 2020-12-11 14:30    Antisymmetric interlayer exchange coupling in magnetic multilayers
302 2020-12-11 16:00    Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials
301 2020-12-23 10:00    Online workshop for Quantitative Phase Imaging file
300 2021-01-28 15:00    Topological Transport of Deconfined Hedgehogs in Magnets file
299 2021-01-28 18:00    Quantum metamaterials: concept, theory, prototypes and possible applications file
298 2021-02-02 14:30    Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems) file
297 2021-02-15 17:00    Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets file
296 2021-02-17 09:00    석학 대중 강연 및 강의 시리즈 file
295 2021-03-02 16:00    Sensitive terahertz detection with graphene-based transistors file