Tuning anomalous Floquet topological bands with ultracold atoms
- URL: http://arxiv.org/abs/2211.04739v1
- Date: Wed, 9 Nov 2022 08:25:29 GMT
- Title: Tuning anomalous Floquet topological bands with ultracold atoms
- Authors: Jin-Yi Zhang, Chang-Rui Yi, Long Zhang, Rui-Heng Jiao, Kai-Ye Shi,
Huan Yuan, Wei Zhang, Xiong-Jun Liu, Shuai Chen and Jian-Wei Pan
- Abstract summary: Floquet engineering opens the way to create new topological states without counterparts in static systems.
We report the experimental realization and characterization of new anomalous topological states with high-precision Floquet engineering.
- Score: 6.035032969908176
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The Floquet engineering opens the way to create new topological states
without counterparts in static systems. Here, we report the experimental
realization and characterization of new anomalous topological states with
high-precision Floquet engineering for ultracold atoms trapped in a shaking
optical Raman lattice. The Floquet band topology is manipulated by tuning the
driving-induced band crossings referred to as band inversion surfaces (BISs),
whose configurations fully characterize the topology of the underlying states.
We uncover various exotic anomalous topological states by measuring the
configurations of BISs which correspond to the bulk Floquet topology. In
particular, we identify an unprecedented anomalous Floquet valley-Hall state
that possesses anomalous helicallike edge modes protected by valleys and a
chiral state with high Chern number.
Related papers
- Dissipative preparation of a Floquet topological insulator in an optical lattice via bath engineering [44.99833362998488]
Floquet engineering is an important tool for realizing charge-neutral atoms in optical lattices.
We show that a driven-dissipative system approximates a topological insulator.
arXiv Detail & Related papers (2023-07-07T17:47:50Z) - Real-space detection and manipulation of topological edge modes with
ultracold atoms [56.34005280792013]
We demonstrate an experimental protocol for realizing chiral edge modes in optical lattices.
We show how to efficiently prepare particles in these edge modes in three distinct Floquet topological regimes.
We study how edge modes emerge at the interface and how the group velocity of the particles is modified as the sharpness of the potential step is varied.
arXiv Detail & Related papers (2023-04-04T17:36:30Z) - Wave packet dynamics and edge transport in anomalous Floquet topological
phases [0.0]
An anomalous Floquet topological phase can in general generate more robust chiral edge motion than a Haldane phase.
Our results demonstrate that the rich interplay of wave packet dynamics and topological edge states can serve as a versatile tool in ultracold quantum gases in optical lattices.
arXiv Detail & Related papers (2023-02-16T18:45:49Z) - Unconventional Floquet topological phases from quantum engineering of
band inversion surfaces [2.722229723122409]
Floquet engineering provides a toolbox for the realization of novel quantum phases without static counterparts.
We propose a scheme to realize unconventional Floquet topological phases by engineering local band structures in particular momentum subspace called band surfaces (BISs)
This scheme is based on a new bulk-boundary correspondence that for a class of generic $d$-dimensional periodically driven systems, the local topological structure formed in each BIS uniquely determines the features of gapless boundary modes.
arXiv Detail & Related papers (2021-12-02T10:08:20Z) - Rotating Majorana Zero Modes in a disk geometry [75.34254292381189]
We study the manipulation of Majorana zero modes in a thin disk made from a $p$-wave superconductor.
We analyze the second-order topological corner modes that arise when an in-plane magnetic field is applied.
We show that oscillations persist even in the adiabatic phase because of a frequency independent coupling between zero modes and excited states.
arXiv Detail & Related papers (2021-09-08T11:18:50Z) - Theory of Anomalous Floquet Higher-Order Topology: Classification,
Characterization, and Bulk-Boundary Correspondence [1.9087335681007476]
We provide a framework to understand anomalous Floquet higher-order topological insulators (AFHOTIs)
Such AFHOTIs are defined by their robust, symmetry-protected corner modes pinned at special quasienergies.
The corner-mode physics of an AFHOTI is found to be generically indicated by 3D Dirac/Weyl-like topological singularities.
arXiv Detail & Related papers (2020-10-15T18:00:01Z) - Signatures of the $\pi$-mode anomaly in (1+1) dimensional
periodically-driven topological/normal insulator heterostructures [1.8059692880799785]
A pi-mode anomaly is proposed in a periodically-driven topological/normal (TI/NI) heterostructure.
For the first time, we experimentally observed the $pi$-mode domain wall in certain driven frequencies.
Our prediction and observation could pave a new avenue on exploring anomalies in both periodically-driven classical and quantum systems.
arXiv Detail & Related papers (2020-10-08T20:24:16Z) - Quantum anomalous Hall phase in synthetic bilayers via twistless
twistronics [58.720142291102135]
We propose quantum simulators of "twistronic-like" physics based on ultracold atoms and syntheticdimensions.
We show that our system exhibits topologicalband structures under appropriate conditions.
arXiv Detail & Related papers (2020-08-06T19:58:05Z) - Tunable Fragile Topology in Floquet Systems [1.9087335681007476]
We demonstrate driving-induced fragile topology in two different models, namely, the Floquet honeycomb model and the Floquet $pi$-flux square-lattice model.
In both cases, we discover a rich phase diagram that includes Floquet fragile topological phases protected by crystalline rotation or mirror symmetries.
arXiv Detail & Related papers (2020-05-18T18:00:00Z) - Dynamical solitons and boson fractionalization in cold-atom topological
insulators [110.83289076967895]
We study the $mathbbZ$ Bose-Hubbard model at incommensurate densities.
We show how defects in the $mathbbZ$ field can appear in the ground state, connecting different sectors.
Using a pumping argument, we show that it survives also for finite interactions.
arXiv Detail & Related papers (2020-03-24T17:31:34Z) - Probing chiral edge dynamics and bulk topology of a synthetic Hall
system [52.77024349608834]
Quantum Hall systems are characterized by the quantization of the Hall conductance -- a bulk property rooted in the topological structure of the underlying quantum states.
Here, we realize a quantum Hall system using ultracold dysprosium atoms, in a two-dimensional geometry formed by one spatial dimension.
We demonstrate that the large number of magnetic sublevels leads to distinct bulk and edge behaviors.
arXiv Detail & Related papers (2020-01-06T16:59:08Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.