In magnetic topological materials,the interplay between magnetism and nontrivial topology gives rise to exotic quantum transport phenomena,including the anomalous Hall effect and anomalous Nernst effect.Here,we report...In magnetic topological materials,the interplay between magnetism and nontrivial topology gives rise to exotic quantum transport phenomena,including the anomalous Hall effect and anomalous Nernst effect.Here,we report the observation of intrinsic topological Hall and topological Nernst effects below the Néel temperature(T_(N)=25 K)in the antiferromagnetic(AFM)topological insulator Mn Bi_(2)Te_(4).The maximum of topological Hall resistivity reaches approximately 9μΩ·cm at 2 K,while the topological Nernst signal attains a peak value of 0.1μV/K near 10 K.These anomalous transport behaviors originate from the net Berry curvature induced by the non-collinear spin structure in the canted AFM state.Our results suggest a close connection between the topological thermoelectric effect and non-collinear AFM order in AFM topological insulators.展开更多
Multicolor fiber lasers have emerged as a promising technology with significant applications in optical communications,laser ranging,and precision sensing.Beyond their practical utility,these systems serve as ideal pl...Multicolor fiber lasers have emerged as a promising technology with significant applications in optical communications,laser ranging,and precision sensing.Beyond their practical utility,these systems serve as ideal platforms for investigating fundamental soliton phenomena,including soliton collisions,explosions,and state transitions.However,the complex nonlinear dynamics inherent in these systems present substantial challenges for conventional numerical simulations.展开更多
Innovation in microscopy has often been critical in advancing both fundamental science and technological progress.Notably,the evolution of ultrafast near-field optical nano-spectroscopy and nano-imaging has unlocked t...Innovation in microscopy has often been critical in advancing both fundamental science and technological progress.Notably,the evolution of ultrafast near-field optical nano-spectroscopy and nano-imaging has unlocked the ability to image at spatial scales from nanometers to angströms and temporal scales from nanoseconds to femtoseconds.This approach revealed a plethora of fascinating light-matter states and quantum phenomena,including various species of polaritons,quantum phases,and complex many-body effects.This review focuses on the working principles and state-of-the-art development of ultrafast tip-enhanced and near-field microscopy,integrating diverse optical pump-probe methods across the terahertz(THz)to ultraviolet(UV)spectral ranges.It highlights their utility in examining a broad range of materials,including two-dimensional(2D),organic molecular,and hybrid materials.The review concludes with a spatio-spectral-temporal comparison of ultrafast nano-imaging techniques,both within already well-defined domains,and offering an outlook on future developments of ultrafast tip-based microscopy and their potential to address a wider range of materials.展开更多
基金supported in part by the Natural Science Foundation of China(Grant No.U1932155)the Hangzhou Joint Fund of the Zhejiang Provincial Natural Science Foundation of China(Grant No.LHZSZ24A040001)+4 种基金the National Key R&D Program of China(Grant No.2022YFA1602602)the National Key R&D Program of China(Grant Nos.2022YFA1403800 and 20-23YFA1406500)the China Postdoctoral Science Foundation(Grant No.2023-M730011)the National Natural Science Foundation of China(Grant No.12274459)supported by the HZNU Scientific Research and Innovation Team Project(No.TD2025013)。
文摘In magnetic topological materials,the interplay between magnetism and nontrivial topology gives rise to exotic quantum transport phenomena,including the anomalous Hall effect and anomalous Nernst effect.Here,we report the observation of intrinsic topological Hall and topological Nernst effects below the Néel temperature(T_(N)=25 K)in the antiferromagnetic(AFM)topological insulator Mn Bi_(2)Te_(4).The maximum of topological Hall resistivity reaches approximately 9μΩ·cm at 2 K,while the topological Nernst signal attains a peak value of 0.1μV/K near 10 K.These anomalous transport behaviors originate from the net Berry curvature induced by the non-collinear spin structure in the canted AFM state.Our results suggest a close connection between the topological thermoelectric effect and non-collinear AFM order in AFM topological insulators.
文摘Multicolor fiber lasers have emerged as a promising technology with significant applications in optical communications,laser ranging,and precision sensing.Beyond their practical utility,these systems serve as ideal platforms for investigating fundamental soliton phenomena,including soliton collisions,explosions,and state transitions.However,the complex nonlinear dynamics inherent in these systems present substantial challenges for conventional numerical simulations.
基金support from the National Natural Science Foundation of China(62175188,62475194)the Science and Technology Commission of Shanghai Municipality(23190712300,23ZR1465800)+5 种基金support from the National Natural Science Foundation of China(61925504)support from the Priority 2030 Federal Academic Leadership Programthe support from the National Natural Science Foundation of China(62305249)support from the National Natural Science Foundation of China(62192770,62192772)support from the National Science Foundation(NSF)Science and Technology Center on Real-Time Functional Imaging(STROBE)under Grant DMR 1548924 for ultrafast pump-probe nano-imaging instrument development,the National Science Foundation(NSF GrantNo.CHE2108009)for strong light matter couplingthe U.S.Department of Energy,Office of Basic Sciences,Division of Material Sciences and Engineering,under award no.DESC0008807 for coherent nano-imaging of quantum materials.
文摘Innovation in microscopy has often been critical in advancing both fundamental science and technological progress.Notably,the evolution of ultrafast near-field optical nano-spectroscopy and nano-imaging has unlocked the ability to image at spatial scales from nanometers to angströms and temporal scales from nanoseconds to femtoseconds.This approach revealed a plethora of fascinating light-matter states and quantum phenomena,including various species of polaritons,quantum phases,and complex many-body effects.This review focuses on the working principles and state-of-the-art development of ultrafast tip-enhanced and near-field microscopy,integrating diverse optical pump-probe methods across the terahertz(THz)to ultraviolet(UV)spectral ranges.It highlights their utility in examining a broad range of materials,including two-dimensional(2D),organic molecular,and hybrid materials.The review concludes with a spatio-spectral-temporal comparison of ultrafast nano-imaging techniques,both within already well-defined domains,and offering an outlook on future developments of ultrafast tip-based microscopy and their potential to address a wider range of materials.
