Non-equilibrium many-body spin dynamics in diamond
2016.11.17 15:14
장소 | #5318(5th fl.) |
---|---|
일시 | Nov. 18th (Fri) 10:30 a.m. |
연사 | Dr. 최 순 원, Havard University |
Non-equilibrium many-body spin dynamics in diamond
Dr. 최 순 원, Havard University
Nov. 18th (Fri) 10:30 a.m., #5318(5th fl.)
Abstract:
In this talk, we will discuss two recent developments in non-equilibrium quantum dynamics of strongly interacting many-body systems: I. critically slow thermalization in a disordered dipolar spin ensemble [1] and II. the observation of discrete time crystalline order [2]. Both of these experiments were enabled by a high density ensemble of nitrogen-vacancy (NV) color centers in diamond [3]. As a mixture of theory and experiments, the talk will be self-contained and pedagogical, reviewing some of basic concepts in many-body localization, Floquet time-crystal, spin properties of NV centers and experimental techniques to manipulate and engineer the dynamics.
Part I:
Statistical mechanics underlies our understanding of macroscopic quantum systems. It is based on the assumption that out-of-equilibrium systems rapidly approach their equilibrium states, forgetting any information about their microscopic initial conditions. This fundamental paradigm is challenged by disordered systems, in which a slowdown or even absence of thermalization is expected. By controlling the spin states of the ~10^6 NV centers, we observe slow, sub-exponential thermalization consistent with power laws that exhibit disorder-dependent exponents; this behavior is modified at late times owing to many-body interactions. These observations are quantitatively explained by a resonance counting theory that incorporates the effects of both disorder and interactions
Part II:
The interplay of periodic driving, disorder, and strong interactions has recently been predicted to result in exotic ``time-crystalline'' phases, which spontaneously break the discrete time-translation symmetry of the underlying drive. We report the experimental observation of such discrete time-crystalline order and the observation of long-lived temporal correlations at integer multiples of the fundamental driving period. We experimentally identify the phase boundary and find that the temporal order is protected by strong interactions; this order is remarkably stable against perturbations, even in the presence of slow thermalization. We provide a theoretical description of approximate Floquet eigenstates of the system based on product state ansatz and predict the phase boundary, which is in qualitative agreement with our observations.
[1] G. Kucsko et al, arXiv:1609.08216
[2] S. Choi et al, arXiv:1610.08057
[3] J. Choi et al, arXiv:1608.05471
Contact: Eun-Gook Moon, Physics Dept., (egmoon@kaist.ac.kr)
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
288 | 2018. 6. 22 10:00am ~ 11:50am | E6-6, Lecture Room 119 (1F) | Prof. Sang Bok Lee, Dept. of Chemistry and Biochemistry, Univ. of Maryland |
Success in Research Career
![]() |
287 | 4월 18일(월), 15:30~ | KI빌딩(E4), 강의실 B501 (5F) | Prof. Robert A. DiStasio Jr. (Cornell University) |
First Principles Approaches for Intermolecular Interactions: From Gas-Phase Dimers to Liquid Water and Molecular Crystal Polymorphism
![]() |
286 | December 2(Wed), 10:00AM | Zoom | Prof. Rakshya Katiwada (Illinois Institute of Technology) |
Recent progress in Axion Dark Matter eXperiment (ADMX) technology
![]() |
285 | Nov 17th 12:00 PM | Online(Zoom) | Prof. Qiang Lin (Univ. of Rochester, USA) |
Quantum- & Nano-Photonics" 세미나 시리즈
![]() |
284 | October 15 (Tue.), 16:00 PM | #1323, E6-2 | Prof. Pilkyung Moon |
Moiré superlattices and graphene quasicrystal
![]() |
283 | Aug. 16 (Wed.), 4 PM | #1322 (E6-2. 1st fl.) | Prof. Noejung Park (UNIST) |
Phonon-driven spin-Floquet valleytro-magnetism
![]() |
282 | August. 14th (Wed.), 4:00PM, | Rm. 1323, E6 | Prof. Nicolas Treps |
Quantum Optics, at the heart of quantum metrology and quantum information
![]() |
281 | October 17 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Namkyoo Park |
Top down manipulation of Waves : From Metamaterials, Correlated Disorder, Quantum Analogy, to Digital Processing
![]() |
280 | DEC. 27 (Thu), 04:00 PM | E6-2. 1st fl. #1323 | Prof. Na Young Kim |
Quantum Innovation (QuIN) Laboratory
![]() |
279 | June 4 (Tue.), 5:00 PM | #1323, E6-2 | Prof. Minsu Kim |
Stochastic nature of bacterial eradication using antibiotics
![]() |
278 | 2015/06/03, 12PM | Room 101, E11 | Prof. Min-Kyo, Seo & Hansuek, Lee(KAIST) |
The First Wednesday Multidisciplinary Forum
![]() |
277 | Nov. 10th(Thu) 4 p.m. | E6-2. #1323(1st fl.) | Prof. Min Seok Jang, Electrical Engineering, KAIST | Low Dimensional Active Plasmonics and Electron Optics in Graphene |
276 | 2018년 9월 7일 (금), 3PM | 학술문화관 (E9), 2층 양승택 오디토리움 | Prof. Martin Head-Gordon, UC Berkeley |
Recent developments in density functional theory: From new functionals to the nature of the chemical bond
![]() |
275 | Apr. 9 (Fri.), 10:00 AM | Zoom webinar | Prof. Marko Loncar (Harvard University, USA) |
Integrated Lithium Niobate Photonics
![]() |
274 | Apr. 19(Tue.), 2PM | #1323(E6-2. 1st fl.) | Prof. Mark Koepke, Department of Physics and Astronomy, West Virginia University, USA | Nonlocal collisional electron transport in partially ionized plasma generation, structure, and stability |
273 | November 28 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kyung Taec Kim |
Generation of coherent EUV emissions using ultrashort laser pulses
![]() |
272 | May 20(Fri.) 11:00 | E6-1 #1323 | Prof. Kwanpyo Kim (Department of Physics, Yonsei University) | (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals |
271 | May 9 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kwang Geol Lee |
Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters
![]() |
270 | May 9 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kwang Geol Lee |
Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters
![]() |
269 | February 12(Web.) | E6-2, #5318 | Prof. Kunio Kaneta |
From inflation to new weak-scale
![]() |