visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Non-reciprocal phase transitions

2022.03.28 11:35

admin 조회 수:536

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
307 2018-10-16 10:00  #1323, E6-2  Capturing protein cluster dynamics and gene expression output in live cells file
306 2023-02-28 11:00  E6 Room(#1322)  Topotactic redox engineering toward novel material file
305 2022-11-10 16:00  E6-2. 1st fl. #1323  Probing the Origin of Cosmic Infrared Background and Future Prospects with SPHEREx
304 2015-11-10 16:00  E6-2, #1323  Rapid heating of matter using high power lasers
303 2015-12-01 16:00  E6-2, #1323  Introducing extra dimensions to spectroscopic studies of advanced quantum materials
302 2023-04-13 11:00  Zoom  [High Energy Theory Seminar]Noninvertible Gauss Law and Axions
301 2023-12-14 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  Superconducting qubits for large-scale quantum computers file
300 2016-09-02 14:30  E6-2(1st fl.), #1323  Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
299 2016-09-02 16:00  E6-2(1st fl) #1323  Quantum Electrical Transport in Topological Insulator Nanowires
298 2018-10-15 16:00  #1323, E6-2  Universal properties of macroscopic current-carrying systems file
297 2018-04-11 13:30  #1323 (E6-2, 1st fl.)  Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
296 2022-06-10 11:00  Online seminar  Record-quality two-dimensional electron systems file
295 2022-05-13 16:00  자연과학동(E6-2) 1st fl. #1323  High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
294 2017-05-12 13:30  E6-2. 1st fl. #1323  Topological Dirac insulator
293 2018-04-11 16:00  #1323 (E6-2, 1st fl.)  Non-Gaussian states of multimode light generated via hybrid quantum information processing file
292 2016-05-13 13:30  E6. #1501(1st fl.)  Aperiodic crystals in low dimensions
291 2022-08-09 14:00  KI building (E4), Lecture Room Red (B501)  Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
290 2018-03-16 16:00  E6-2. 1st fl. #1323  Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
289 2018-03-16 16:00  E6-2. 1st fl. #1323  Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
288 2015-11-06 16:30  E6-2, #5318  Topological Dirac line nodes in centrosymmetric semimetals