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- W4284892789 abstract "BEC is a quantum phenomenon, where a macroscopic number of bosons occupy the lowest energy state and acquire coherence at low temperatures. It is realized not only in $^4$He and dilute atomic gases, but also in quantum magnets, where hardcore bosons, introduced by the Matsubara-Matsuda transformation of spins, condense. In 3D antiferromagnets, an XY-type long-range ordering (LRO) occurs near a magnetic-field-induced transition to a fully polarized state (FP) and has been successfully described as a BEC in the last few decades. An attractive extension of the BEC in 3D magnets is to make their 2D analogue. For a strictly 2D system, BEC cannot take place due to the presence of a finite density of states at zero energy, and a Berezinskii-Kosterlitz-Thouless (BKT) transition may instead emerge. In a realistic quasi-2D magnet consisting of stacked 2D magnets, a small but finite interlayer coupling stabilizes marginal LRO and BEC, but such that 2D physics, including BKT fluctuations, is still expected to dominate. A few systems were reported to show such 2D-limit BEC, but at very high magnetic fields that are difficult to access. The honeycomb $S$ = 1/2 Heisenberg antiferromagnet YbCl$_3$ with an intra-layer coupling $Jsim$ 5 K exhibits a transition to a FP state at a low in-plane magnetic field of $H_{rm s}$ = 5.93 T. Here, we demonstrate that the LRO right below $H_{rm s}$ is a BEC in the 2D-limit stabilized by an extremely small interlayer coupling $J_{perp}$ of 10$^{-5}J$. Reflecting the 2D limit, an extended region of thermal fluctuations is observed from the BEC transition temperature $T_{rm c}$ up to $sim 2T_{rm c}$, which may carry certain BKT characteristics. At $H_{rm s}$, we clearly capture 2D-limit quantum fluctuations that can be described as the formation of a highly mobile, interacting 2D Bose gas in the dilute limit." @default.
- W4284892789 created "2022-07-09" @default.
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- W4284892789 date "2022-07-05" @default.
- W4284892789 modified "2023-09-29" @default.
- W4284892789 title "Quantum critical Bose gas in the two-dimensional limit in the honeycomb antiferromagnet YbCl$_3$ under magnetic fields" @default.
- W4284892789 doi "https://doi.org/10.48550/arxiv.2207.02329" @default.
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