The crossover between short-range and long-range(LR)universal behaviors remains a central theme in the physics of LR interacting systems.The competition between LR coupling and the Berezinskii-Kosterlitz-Thouless mech...The crossover between short-range and long-range(LR)universal behaviors remains a central theme in the physics of LR interacting systems.The competition between LR coupling and the Berezinskii-Kosterlitz-Thouless mechanism makes the problem more subtle and less understood in the two-dimensional(2D)XY model,a cornerstone for investigating low-dimensional phenomena and their implications in quantum computation.We study the 2D XY model with algebraically decaying interaction~1/r^(2+σ).Utilizing an advanced update strategy,we conduct LR Monte Carlo simulations of the model up to a linear size of L=8192.Our results demonstrate continuous phase transitions into a ferromagnetic phase forσ<2,which exhibit the simultaneous emergence of a long-ranged order and a power-law decaying correlation function due to the Goldstone mode.Furthermore,we fnd logarithmic scaling behaviors in the low-temperature phase atσ=2.The observed scaling behaviors in the low-temperature phase forσ≤2 agree with our theoretical analysis.Our fndings request further theoretical understanding and can be of practical application in cutting-edge experiments like Rydberg atom arrays.展开更多
目的探讨罕见嵌合体合并单基因变异的产前诊断策略、分子形成机制及临床预后,为遗传咨询与管理提供循证依据。方法2025年9月就诊于湛江市妇幼保健院的1例不良孕产史孕妇,联合超声检查、家系短串联重复序列(short tandem repeats,STR)比...目的探讨罕见嵌合体合并单基因变异的产前诊断策略、分子形成机制及临床预后,为遗传咨询与管理提供循证依据。方法2025年9月就诊于湛江市妇幼保健院的1例不良孕产史孕妇,联合超声检查、家系短串联重复序列(short tandem repeats,STR)比对、母源污染鉴定、染色体核型分析、染色体微阵列分析(chromosomal microarray analysis,CMA)、Sanger测序并结合文献复习分析相关特征。结果羊水核型分析结果为46,XY,母体DNA污染检测阴性;STR分型显示胎儿13号及21号染色体呈三峰模式(峰高约为2∶1∶1),家系比对证实该结果来源于1种母源等位基因及2种父源等位基因;CMA明确胎儿存在两种46,XY细胞系,各占50%即为46,XY/46,XY异源嵌合体;Sanger测序结果证实胎儿携带了四肽重复序列结构域7A基因(tetratricopeptide repeat domain 7A,TTC7A)复合杂合变异;超声检查提示胎儿存在多发发育异常。结论STR与CMA联合应用可有效诊断46,XY/46,XY异源嵌合体;本例嵌合体可能是母亲生殖细胞孤雌分裂产生双卵子,分别与同一父亲Y染色体基因型不同的精子结合形成双受精卵后胚胎融合而成,临床需结合不良孕产史及单基因变异特征开展遗传咨询。展开更多
Three known compounds were isolated from the endophytic fungus Trichoderma sp Xy24 from a mangrove plant Xylocarpus granatum by using various column chromatography techniques. Their structures were identified as harzi...Three known compounds were isolated from the endophytic fungus Trichoderma sp Xy24 from a mangrove plant Xylocarpus granatum by using various column chromatography techniques. Their structures were identified as harzianone （1）, trichoacorenol （2）, and trichodimerol （3） by extensive spectroscopic analysis. Among them, 1 was a harziane diterpene, 2 was a sesquiterpene alcohol, and 3 was a polyketide with a completely symmetric configuration. Compound 3 exhibited medium inhibitory activity with an IC50 value of 74.6 μM using a NA （H7N9）/MUNANA model.展开更多
Moiré superlattices provide a new platform to engineer various many-body problems. In this work, we consider arrays of quantum dots(QD) realized on semiconductor moiré superlattices with a deep moiré po...Moiré superlattices provide a new platform to engineer various many-body problems. In this work, we consider arrays of quantum dots(QD) realized on semiconductor moiré superlattices with a deep moiré potential. We diagonalize single QD with multiple electrons, and find degenerate ground states serving as local degrees of freedom(qudits) in the superlattice. With a deep moiré potential, the hopping and exchange interaction between nearby QDs become irrelevant,and the direct Coulomb interaction of the density–density type dominates. Therefore, nearby QDs must arrange the spatial densities to optimize the Coulomb energy. When the local Hilbert space has a two-fold orbital degeneracy, we find that a square superlattice realizes an anisotropic XY model, while a triangular superlattice realizes a generalized XY model with geometric frustration.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12204173 and 12275263)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0301900)supported by the Natural Science Foundation of Fujian Province 802 of China(Grant No.2023J02032)。
文摘The crossover between short-range and long-range(LR)universal behaviors remains a central theme in the physics of LR interacting systems.The competition between LR coupling and the Berezinskii-Kosterlitz-Thouless mechanism makes the problem more subtle and less understood in the two-dimensional(2D)XY model,a cornerstone for investigating low-dimensional phenomena and their implications in quantum computation.We study the 2D XY model with algebraically decaying interaction~1/r^(2+σ).Utilizing an advanced update strategy,we conduct LR Monte Carlo simulations of the model up to a linear size of L=8192.Our results demonstrate continuous phase transitions into a ferromagnetic phase forσ<2,which exhibit the simultaneous emergence of a long-ranged order and a power-law decaying correlation function due to the Goldstone mode.Furthermore,we fnd logarithmic scaling behaviors in the low-temperature phase atσ=2.The observed scaling behaviors in the low-temperature phase forσ≤2 agree with our theoretical analysis.Our fndings request further theoretical understanding and can be of practical application in cutting-edge experiments like Rydberg atom arrays.
基金Science&Technology Project of Guangdong Province(Grant No.2011A080403020)the Fundamental Research Funds for the Central Universities(Grant No.2012N06)
文摘Three known compounds were isolated from the endophytic fungus Trichoderma sp Xy24 from a mangrove plant Xylocarpus granatum by using various column chromatography techniques. Their structures were identified as harzianone （1）, trichoacorenol （2）, and trichodimerol （3） by extensive spectroscopic analysis. Among them, 1 was a harziane diterpene, 2 was a sesquiterpene alcohol, and 3 was a polyketide with a completely symmetric configuration. Compound 3 exhibited medium inhibitory activity with an IC50 value of 74.6 μM using a NA （H7N9）/MUNANA model.
基金Project supported by the National Natural Science Foundation of China (Grant No. 12274005)the National Key Research and Development Program of China (Grant No. 2021YFA1401903)Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302403)。
文摘Moiré superlattices provide a new platform to engineer various many-body problems. In this work, we consider arrays of quantum dots(QD) realized on semiconductor moiré superlattices with a deep moiré potential. We diagonalize single QD with multiple electrons, and find degenerate ground states serving as local degrees of freedom(qudits) in the superlattice. With a deep moiré potential, the hopping and exchange interaction between nearby QDs become irrelevant,and the direct Coulomb interaction of the density–density type dominates. Therefore, nearby QDs must arrange the spatial densities to optimize the Coulomb energy. When the local Hilbert space has a two-fold orbital degeneracy, we find that a square superlattice realizes an anisotropic XY model, while a triangular superlattice realizes a generalized XY model with geometric frustration.
