Observation of symmetry-protected topological band with ultracold fermions
| Autor: | Shanchao Zhang, Bo Song, Long Zhang, Gyu-Boong Jo, Ting Fung Jeffrey Poon, Elnur Hajiyev, Xiong-Jun Liu, Chengdong He |
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| Rok vydání: | 2017 |
| Předmět: |
Quantum dynamics
High Energy Physics::Lattice FOS: Physical sciences 02 engineering and technology Quantum phases Topology 01 natural sciences Condensed Matter - Strongly Correlated Electrons Ultracold atom 0103 physical sciences Physics::Atomic Physics 010306 general physics Quantum Topology (chemistry) Research Articles Computer Science::Cryptography and Security Physics Condensed Matter::Quantum Gases Optical lattice Quantum Physics Multidisciplinary Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter::Other SciAdv r-articles Fermion 021001 nanoscience & nanotechnology Quantum Gases (cond-mat.quant-gas) Topological insulator 0210 nano-technology Condensed Matter - Quantum Gases Quantum Physics (quant-ph) Research Article |
| Zdroj: | Science Advances |
| DOI: | 10.48550/arxiv.1706.00768 |
| Popis: | Topologically protected states are observed in engineered optical lattices with ultracold fermions. Symmetry plays a fundamental role in understanding complex quantum matter, particularly in classifying topological quantum phases, which have attracted great interests in the recent decade. An outstanding example is the time-reversal invariant topological insulator, a symmetry-protected topological (SPT) phase in the symplectic class of the Altland-Zirnbauer classification. We report the observation for ultracold atoms of a noninteracting SPT band in a one-dimensional optical lattice and study quench dynamics between topologically distinct regimes. The observed SPT band can be protected by a magnetic group and a nonlocal chiral symmetry, with the band topology being measured via Bloch states at symmetric momenta. The topology also resides in far-from-equilibrium spin dynamics, which are predicted and observed in experiment to exhibit qualitatively distinct behaviors in quenching to trivial and nontrivial regimes, revealing two fundamental types of spin-relaxation dynamics related to bulk topology. This work opens the way to expanding the scope of SPT physics with ultracold atoms and studying nonequilibrium quantum dynamics in these exotic systems. |
| Databáze: | OpenAIRE |
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