Science China Physics, Mechanics & Astronomy最新文献_第9页

New breakthrough: Building non-markovian environments for single-qubit systems at any time interval 新突破：为任意时间间隔的单量子位系统构建非马尔可夫环境

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-16 DOI: 10.1007/s11433-024-2568-0

H. Z. Shen

引用次数: 0

Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe 退火kagome反铁磁体FeGe的各向异性输运特性和拓扑霍尔效应

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-16 DOI: 10.1007/s11433-024-2553-3

Jiajun Ma, Chenfei Shi, Yantao Cao, Yuwei Zhang, Yazhou Li, Jiaxing Liao, Jialu Wang, Wenhe Jiao, Hanjie Guo, Chenchao Xu, Shixun Cao, Jianhui Dai, Jin-Ke Bao, Yuke Li

{"title":"Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe","authors":"Jiajun Ma, Chenfei Shi, Yantao Cao, Yuwei Zhang, Yazhou Li, Jiaxing Liao, Jialu Wang, Wenhe Jiao, Hanjie Guo, Chenchao Xu, Shixun Cao, Jianhui Dai, Jin-Ke Bao, Yuke Li","doi":"10.1007/s11433-024-2553-3","DOIUrl":"10.1007/s11433-024-2553-3","url":null,"abstract":"<div>Electron correlation often gives birth to various orders in quantum materials. Recently, a strongly correlated kagome antiferromagnet FeGe is discovered to undergo a charge density wave transition inside the A-type antiferromagnetic state, providing an opportunity to explore the interplay between charge order and magnetism. Here, we reported the observation of anisotropic resistivity and Hall effect, along with a topological Hall effect, in the annealed FeGe crystals. As the current flows along the ab-plane, the temperature dependence of ρab exhibits a distinct resistivity loop related to a first-order transition at Tcdw. The applied magnetic fields do not alter Tcdw but can induce a spin-flop transition at Hsf. Consequently, a field-induced large topological Hall effect is observed in the canting antiferromagnetic (CAFM) state below Tcant, which is possibly attributed to the non-trivial spin texture during the spin-flop process. Whereas, as current is parallel to c-axis, both the field-induced transitions in ρc and χc disappear. Instead, the Hall resistivity in the annealed FeGe significantly exhibits a deviation from the linear field-dependent. These findings provide valuable insight into revealing the interplay among magnetism, charge order and topology in the kagome magnets.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring non-Hermitian dynamics in a superconducting quantum circuit via dissipation-free approach 利用无耗散方法探索超导量子电路中的非厄米动力学

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-15 DOI: 10.1007/s11433-024-2554-0

Yang Yu

引用次数: 0

Tunable non-Markovian and quantum coherence in the single-qubit dephasing noise channel 单量子位去相噪声信道中的可调谐非马尔可夫相干和量子相干

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-15 DOI: 10.1007/s11433-024-2565-2

Na-Na Zhang, Chao-Yi Wu, Xu Zhou, Qi-Yuan Liu, Cheng-Ge Liu, Yong-Rui Guo, Ren-Pu Li

{"title":"Tunable non-Markovian and quantum coherence in the single-qubit dephasing noise channel","authors":"Na-Na Zhang, Chao-Yi Wu, Xu Zhou, Qi-Yuan Liu, Cheng-Ge Liu, Yong-Rui Guo, Ren-Pu Li","doi":"10.1007/s11433-024-2565-2","DOIUrl":"10.1007/s11433-024-2565-2","url":null,"abstract":"<div>In this paper, we construct a single-qubit dephasing noise channel based on the nuclear magnetic resonance (NMR) system by employing the bath-engineering technology, and achieve the construction of the tunable non-Markovian environment in the dephasing noise channel. Our findings indicate that for the single-qubit system, the transition of system dynamics from Markovian to non-Markovian can be achieved by adjusting the base frequency of the noise power spectrum. However, the base frequency corresponding to this phase transition point is not fixed, and there is a certain relationship between it and the total evolution time of the single-qubit system. Through our research, we discovered a fundamental relationship: if the single-qubit system dynamics undergoe a transition from Markovian to non-Markovian at ω0 within 0–2t ms, shortening the evolution time to 0-t ms results in an increase of the phase transition point to 2ω0. This insight offers crucial guidance for artificially crafting non-Markovian environments across arbitrary time scales in single-qubit systems, and it is not limited by the type of noise. Apart from system dynamics, quantum coherence is also a focal point of our research. We find that when the system dynamics exhibit non-Markovian behavior, the quantum coherence of the single-qubit system experiences revivals. Notably, the timing of these coherence revivals aligns with the instants of the non-Markovianity enhancement. Therefore, our research also serves as a pivotal foundation for the artificial manipulation and realization of quantum coherence revivals within diverse single-qubit systems.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anomalous open orbits in Hofstadter spectrum of Chern insulator 陈氏绝缘子霍夫施塔特谱中的异常开轨道

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-14 DOI: 10.1007/s11433-024-2564-8

Haijiao Ji, Peng Zhou, Noah F. Q. Yuan, Hua Jiang, Haiwen Liu, X. C. Xie

{"title":"Anomalous open orbits in Hofstadter spectrum of Chern insulator","authors":"Haijiao Ji, Peng Zhou, Noah F. Q. Yuan, Hua Jiang, Haiwen Liu, X. C. Xie","doi":"10.1007/s11433-024-2564-8","DOIUrl":"10.1007/s11433-024-2564-8","url":null,"abstract":"<div>The nontrivial band topology of Chern insulator can enrich the content of its Hofstadter butterfly spectra, which is closely related to recent experiments in twisted bilayer graphene and cold atom systems. We investigate the Hofstadter spectrum for various models of Chern insulators under a rational flux ({phi_{0}}over{q}), here (phi_{0}={hover{e}}) and q being an integer. We find the number of splitting subbands is ∣q − C∣ with C denoting the Chern number of parent band. Importantly, anomalous open-orbital subbands with Chern numbers q − 1 and −q − 1 emerge unexpectedly, which are beyond the parameter window (−q/2, q/2) of the Diophantine equation studied by Thouless-Kohmoto-Nightingale-den Nijs [Phys. Rev. Lett. 49, 405 (1982)]. The emergence of anomalous open orbits can be traced by analyzing the evolution of the Hofstadter spectrum, identifying as a new type of topological phase transition. These novel findings not only pinpoint the peculiar Hofstadter spectrum of Chern insulator, but also provide routes to study exotic characteristics beyond the Landau level physics.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dissipation-free approach for realizing non-Hermitian dynamics in a superconducting circuit 实现超导电路非厄米动力学的无耗散方法

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-13 DOI: 10.1007/s11433-024-2549-0

Yi-Hao Kang, Yang Xiao, Yu Wang, Qi-Ping Su, Chui-Ping Yang

{"title":"Dissipation-free approach for realizing non-Hermitian dynamics in a superconducting circuit","authors":"Yi-Hao Kang, Yang Xiao, Yu Wang, Qi-Ping Su, Chui-Ping Yang","doi":"10.1007/s11433-024-2549-0","DOIUrl":"10.1007/s11433-024-2549-0","url":null,"abstract":"<div>Non-Hermitian dynamics exhibits a wealth of surprising and potentially useful phenomena. However, it is typically realized by coupling a system with thermal reservoirs, which makes the system suffer from thermal fluctuations associated with the dissipation. Here, we propose a dissipation-free approach to realize non-Hermitian dynamics using a superconducting circuit composed of two resonators and a superconducting qutrit. The non-Hermiticity arises in the dynamical matrix for the evolution of the two resonators in the Heisenberg picture, via a photon-number non-conserved dynamics. The energy spectrum of the non-Hermitian dynamical matrix can be retrieved by measuring the state of the two resonators, and a phase transition of the energy spectrum can be observed by varying the control parameters. In the realization of the non-Hermitian dynamics, the dissipation of the system and the post-selection are not required. Thus, the approach is implemented in a deterministic way, and the reservoir-induced noise is suppressed. Numerical simulations indicate that the energy spectrum of the non-Hermitian dynamical matrix obtained via the measurement of the resonators is in accordance with the theoretical prediction. Moreover, we demonstrate the parity discrimination for the state of two four-level qudits as an application, exhibiting the potential of the non-Hermitian dynamics in the field of quantum measurement. This work opens a new avenue for the realization of non-Hermitian dynamics and may have a significant implication in exploring the non-Hermitian phenomena.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating the p-Ω interactions and correlation functions 研究p-Ω相互作用和相关函数

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-10 DOI: 10.1007/s11433-024-2580-9

Ye Yan, Qi Huang, Youchang Yang, Hongxia Huang, Jialun Ping

{"title":"Investigating the p-Ω interactions and correlation functions","authors":"Ye Yan, Qi Huang, Youchang Yang, Hongxia Huang, Jialun Ping","doi":"10.1007/s11433-024-2580-9","DOIUrl":"10.1007/s11433-024-2580-9","url":null,"abstract":"<div>Motivated by experimental measurements, we investigate the p-Ω correlation functions and interactions on the basis of a quark model. By solving the inverse scattering problem with channel coupling, we renormalize the coupling to other channels into an effective single-channel p-Ω potentials. The effects of Coulomb interaction and spin-averaging are also discussed. According to our results, the depletion of the p-Ω correlation functions, which is attributed to the JP = 2+ bound state not observed in the ALICE Collaboration’s measurements (Nature 588, 232 (2020)), can be explained by the contribution of the attractive JP = 1+ component in spin-averaging. So far, we have provided a consistent description of the p-Ω system from the perspective of the quark model, including the energy spectrum, scattering phase shifts, and correlation functions. The existence of the p-Ω bound state has been supported by all three aspects. Additionally, a sign of the p-Ω correlation function’s subtle sub-unity part can be seen in experimental measurements, which warrants more precise verification in the future.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pulsar scintillation reveals the Gum Nebula as a scattering screen 脉冲星闪烁显示树胶星云是一个散射屏

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-09 DOI: 10.1007/s11433-024-2566-8

Dan Stinebring

引用次数: 0

Modulation of the octahedral structure and potential superconductivity of La3Ni2O7 through strain engineering 应变工程对La3Ni2O7八面体结构和潜在超导性的调制

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-09 DOI: 10.1007/s11433-024-2583-y

Zihao Huo, Zhihui Luo, Peng Zhang, Aiqin Yang, Zhengtao Liu, Xiangru Tao, Zihan Zhang, Shumin Guo, Qiwen Jiang, Wenxuan Chen, Dao-Xin Yao, Defang Duan, Tian Cui

{"title":"Modulation of the octahedral structure and potential superconductivity of La3Ni2O7 through strain engineering","authors":"Zihao Huo, Zhihui Luo, Peng Zhang, Aiqin Yang, Zhengtao Liu, Xiangru Tao, Zihan Zhang, Shumin Guo, Qiwen Jiang, Wenxuan Chen, Dao-Xin Yao, Defang Duan, Tian Cui","doi":"10.1007/s11433-024-2583-y","DOIUrl":"10.1007/s11433-024-2583-y","url":null,"abstract":"<div>The recent transport measurements of La3Ni2O7 uncovered a “right-triangle” shape of the superconducting dome in the pressure-temperature (P-T) phase diagram. Motivated by this, we perform theoretical first-principles studies of La3Ni2O7 with the pressure ranging from 0 to 100 GPa. Notably, we reveal a pressure dependence of the (text{Ni-}d_{,z^{2}}) electron density at the Fermi energy ((n_{z}^{E_{rm{F}}})) that highly coincides with such shape. On this basis, we further explore the electronic structure under uniaxial stress. By tracking the stress response of (n_{z}^{E_{rm{F}}}), we propose that superconductivity can be achieved by applying only ⋃2 GPa of compression along the c axis. The idea is further exemplified from the perspectives of lattice distortion, band structure, Fermi surface and superconducting phase coherence. We also discuss the possible charge modulation under the stress and provide an insight into the relation between (n_{z}^{E_{rm{F}}}) and the superconducting Tc in La3Ni2O7 system. Our study provides new routes to the search of high-Tc superconductors in future experiments.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigations of liquid-liquid transitions in metallic melts by fast differential scanning calorimetry 快速差示扫描量热法研究金属熔体液-液转变

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-01-06 DOI: 10.1007/s11433-024-2542-4

Qi Cheng, Yonghao Sun, Weihua Wang

引用次数: 0