Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-25707-z
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Funding
- NSFC [11804383]
- NSF of Jiangsu Province [BK20180637]
- Fundamental Research Funds for the Central Universities [2018QNA39]
- NSF [DMR-1846109]
- Alfred P. Sloan Foundation
- Discovery Grant from NSERC
- Canada Research Chair
- Fondation Courtois
- Etablissement de nouveaux chercheurs et de nouvelles chercheuses universitaires grant from FRQNT
- RGC of Hong Kong SAR of China [17303019, 17301420, AoE/P-701/20]
- National Key Research and Development Program [2016YFA0300502]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB33000000]
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The experimental discovery of Anyons in two-dimensional electron gases has opened up new possibilities for studying quantum particles beyond bosons and fermions. Large-scale quantum Monte Carlo simulations have revealed unique conductivity properties near a phase transition, with implications for quantum materials research.
The experimental discovery of the fractional Hall conductivity in two-dimensional electron gases revealed new types of quantum particles, called anyons, which are beyond bosons and fermions as they possess fractionalized exchange statistics. These anyons are usually studied deep inside an insulating topological phase. It is natural to ask whether such fractionalization can be detected more broadly, say near a phase transition from a conventional to a topological phase. To answer this question, we study a strongly correlated quantum phase transition between a topological state, called a Z(2) quantum spin liquid, and a conventional superfluid using large-scale quantum Monte Carlo simulations. Our results show that the universal conductivity at the quantum critical point becomes a simple fraction of its value at the conventional insulator-to-superfluid transition. Moreover, a dynamically self-dual optical conductivity emerges at low temperatures above the transition point, indicating the presence of the elusive vison particles. Our study opens the door for the experimental detection of anyons in a broader regime, and has ramifications in the study of quantum materials, programmable quantum simulators, and ultra-cold atomic gases. In the latter case, we discuss the feasibility of measurements in optical lattices using current techniques.
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