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Title: Observation of π/2 modes in an acoustic floquet system
Authors: Cheng, Zheyu
Bomantara, Raditya Weda
Xue, Haoran
Zhu, Weiwei
Gong, Jiangbin
Zhang, Baile
Keywords: Science::Physics
Issue Date: 2022
Source: Cheng, Z., Bomantara, R. W., Xue, H., Zhu, W., Gong, J. & Zhang, B. (2022). Observation of π/2 modes in an acoustic floquet system. Physical Review Letters, 129(25), 254301-254307.
Project: MOE2019-T2-2-085 
EQUS, CE170100009
Journal: Physical Review Letters 
Abstract: Topological phases of matter have remained an active area of research in the last few decades. Periodic driving is a powerful tool for enriching such exotic phases, leading to various phenomena with no static analogs. One such phenomenon is the emergence of the elusive π/2 modes, i.e., a type of topological boundary state pinned at a quarter of the driving frequency. The latter may lead to the formation of Floquet parafermions in the presence of interaction, which is known to support more computational power than Majorana particles. In this Letter, we experimentally verify the signature of π/2 modes in an acoustic waveguide array, which is designed to simulate a square-root periodically driven Su-Schrieffer-Heeger model. This is accomplished by confirming the 4T-periodicity (T being the driving period) profile of an initial-boundary excitation, which we also show theoretically to be the smoking gun evidence of π/2 modes. Our findings are expected to motivate further studies of π/2 modes in quantum systems for potential technological applications.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.129.254301
Schools: School of Physical and Mathematical Sciences 
Organisations: University of Sydney
King Fahd University of Petroleum and Minerals
National University of Singapore
Centre for Quantum Technologies
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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