Measuring Zak phase in room-temperature atoms

Mao, Ruosong; Xu, Xingqi; Wang, Jiefei; Xu, Chenran; Qian, Gewei; Cai, Han; Zhu, Shi‐Yao; Wang, Da-Wei

doi:10.1038/s41377-022-00990-7

Cited by 9 publications

(2 citation statements)

References 54 publications

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“…Topological flux lattices could also be engineered by generalizing the scheme to two dimensions [71,72]. A similar protocol uses a thermal ensemble of three-level atoms, coupled in a Λ configuration, leading to a so-called superradiant lattice [73], where chiral edge currents and the geometrical Zak phase have been measured [74,75].…”

Section: Synthetic Dimensions -mentioning

confidence: 99%

Atomic topological quantum matter using synthetic dimensions

Fabre,

Nascimbene

2024

EPL

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The realization of topological states of matter in ultracold atomic gases is currently the subject of intense experimental activity. Using a synthetic dimension, encoded in an internal or external degree of freedom that differs from spatial position, can greatly simplify the simulation of gauge fields and give access to exotic topological states. We review here recent advances in the field and discuss future perspectives.

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Section: Synthetic Dimensions -mentioning

confidence: 99%

Atomic topological quantum matter using synthetic dimensions

Fabre,

Nascimbene

2024

EPL

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“…In the well-known Su-Schriefffer-Heeger (SSH) model 20 , the Zak phase can take two values, which are 0 for the topologically trivial case and π for the topologically non-trivial case, corresponding to the winding numbers of and , respectively 21 , 22 . Probing the Zak phase in 1D photonic systems including the photonic SSH model 23 – 29 , has been widely demonstrated within several experimental schemes, such as combining Bloch oscillations and Ramsey interferometry 24 , implementing the mean chiral displacement of a particle’s wavepacket 25 , using leaky photonic lattices 26 , and breaking the chiral symmetry in extended SSH models 27 , 28 . However, due to identical shapes of the bulk band structure in both trivial and non-trivial cases for the SSH lattice, the topological information such as the Zak phase cannot be directly distinguished from the bulk band structure in the current platforms 30 .…”

Section: Introductionmentioning

confidence: 99%

Direct extraction of topological Zak phase with the synthetic dimension

Wang

Rui

et al. 2023

Light Sci Appl

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Measuring topological invariants is an essential task in characterizing topological phases of matter. They are usually obtained from the number of edge states due to the bulk-edge correspondence or from interference since they are integrals of the geometric phases in the energy band. It is commonly believed that the bulk band structures could not be directly used to obtain the topological invariants. Here, we implement the experimental extraction of Zak phase from the bulk band structures of a Su-Schrieffer-Heeger (SSH) model in the synthetic frequency dimension. Such synthetic SSH lattices are constructed in the frequency axis of light, by controlling the coupling strengths between the symmetric and antisymmetric supermodes of two bichromatically driven rings. We measure the transmission spectra and obtain the projection of the time-resolved band structure on lattice sites, where a strong contrast between the non-trivial and trivial topological phases is observed. The topological Zak phase is naturally encoded in the bulk band structures of the synthetic SSH lattices, which can hence be experimentally extracted from the transmission spectra in a fiber-based modulated ring platform using a laser with telecom wavelength. Our method of extracting topological phases from the bulk band structure can be further extended to characterize topological invariants in higher dimensions, while the exhibited trivial and non-trivial transmission spectra from the topological transition may find future applications in optical communications.

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Reconfigurable Photonic Lattices Based on Atomic Coherence

Yuan,

Liang,

et al. 2024

Advanced Physics Research

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The array of coupled optical waveguides, which is also viewed as a photonic lattice, can exhibit abundant photonic band structures depending on the desired spatial arrangements of involved waveguides. Studies of photonic lattices are usually performed in solid‐state materials, where the required periodic susceptibilities can be achieved by employing the femtosecond laser direct‐writing or optical induction method, and have spawned flourishing achievements in manipulating the behaviors of light. Recently, the concept of electromagnetically induced photonic lattice (EIPL) is proposed under the well‐known electromagnetically induced transparency (EIT) in coherently prepared multilevel alkali‐metal atomic systems, where the strong coupling beams producing EIT possess spatially periodic intensity profiles. The inherited instantaneous tunability of susceptibility from EIT‐modulated atomic coherence allows for the easy reconfigurability of EIPLs, which gives rise to exotic beam dynamics under such a readily controllable framework. This paper summarizes the historical overview and recent advances of the in situ and all‐optically reconfigurable EIPLs. The Introduction section provides the scheme and formation of the EIPL via atomic coherence. The following sections review the recently demonstrated dynamical properties of light in various 1D and 2D EIPLs and in compound EIPLs built by two coupling fields. The final section gives brief concluding remarks.

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Measuring Zak phase in room-temperature atoms

Cited by 9 publications

References 54 publications

Atomic topological quantum matter using synthetic dimensions

Atomic topological quantum matter using synthetic dimensions

Direct extraction of topological Zak phase with the synthetic dimension

Reconfigurable Photonic Lattices Based on Atomic Coherence

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