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Articles by Zhengyan Shi
Doping a Fractional Quantum Anomalous Hall Insulator
While elementary particles always obey bosonic or fermionic statistics, “anyonic” quasiparticles with fractional statistics in between bosons and fermions can emerge as collective excitations of certain 2D systems. Anyons are typically confined by magnetic fields into localized states, but recent discoveries of fractional quantum anomalous Hall (FQAH) insulators allow these quasiparticles to exist without an external magnetic field, enabling them to move freely.
Doping a Fractional Quantum Anomalous Hall Insulator
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Ambiguity detection and uncertainty calibration for question answering with large language models
Large Language Models (LLMs) have demonstrated excellent capabilities in Question Answering (QA) tasks, yet their ability to identify and address ambiguous questions remains underdeveloped. Ambiguities in user queries often lead to inaccurate or misleading answers, undermining user trust in these systems. Despite prior attempts using prompt-based methods, performance has largely been equivalent to random guessing, leaving a significant gap in effective ambiguity detection.
Sleep disorders and the association with frailty among community-dwelling older adults in Northwest China: a cross-sectional study
Discussion This large-scale cross-sectional study showed a high prevalence of sleep disorders among community-dwelling older adults. The results also supported the hypothesised association between sleep disorders and comprehensive frailty.
Bounds on R\'enyi entropy growth in many-body quantum systems
Article Text (Subscription Required) Click to Expand References (Subscription Required) Click to Expand Issue Vol. 109, Iss. 4 — April 2024 Access Options Buy Article » Log in with individual APS Journal Account » Log in with a username/password provided by your institution » Get access through a U.S. public or high school library » Article part of CHORUS Accepted manuscript will be available starting 8 April 2025. Download & Share × ×
Local dynamics and the structure of chaotic eigenstates
We identify properties of the energy eigenstates in a family of chaotic spin-chain systems with local interactions, which distinguish them both from integrable systems and from nonlocal chaotic systems. We study the relation between the energy eigenstates of the full system and products of energy eigenstates of two extensive subsystems.
Prevalence and associated factors of frailty among community dwelling older adults in Northwest China: a cross-sectional study
Frailty among community dwelling older adults The participants averaged 27.77 (SD: 10.13) in the total score of the CFAI. According to the cut-off points defining the classification of frailty,25 the majority of the participants were with mild (n=1478, 55.8%) or high (n=390, 14.8%) frailty. The mean scores in the physiological, psychological, social and environmental domains of the CFAI were 8.27±5.66, 5.36±3.91, 9.94±3.68 and 4.21±4.97, respectively.
Will accelerated observer see radiation from the charge that is at rest in observers's frame?
$\begingroup$ So I had a huge debate about this with my friends. Imagine that you are in a non-inertial frame of reference. For simplicity, assume that frame is accelerated along x-axis. You have held a charge in your hand and hence it is rigidly bound to your body. I am in an inertial frame and I see you accelerated and so I see the radiation coming out from the charge. Would you also see the radiation coming out from the charge even though it is at rest with respect to you?
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