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Optimal Floquet state engineering for large scale atom interferometers.
Nat Commun
November 2024
Laboratoire Collisions Agrégats Réactivité (LCAR/FERMI), UMR5589, UniversitéToulouse III - Paul Sabatier and CNRS, 118 Route de Narbonne, F-31062, Toulouse, France.
The effective control of atomic coherence with cold atoms has made atom interferometry an essential tool for quantum sensors and precision measurements. The performance of these interferometers is closely related to the operation of large wave packet separations. We present here a novel approach for atomic beam splitters based on the stroboscopic stabilization of quantum states in an accelerated optical lattice.
View Article and Find Full Text PDFCoordinated Interactions between the Hippocampus and Retrosplenial Cortex in Spatial Memory.
Research (Wash D C)
October 2024
Department of Anesthesiology, Huashan Hospital; Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence, Ministry of Education; Behavioral and Cognitive Neuroscience Center, Institute of Science and Technology for Brain-Inspired Intelligence, MOE Frontiers Center for Brain Science, Fudan University, Shanghai 200433, China.
While a hippocampal-cortical dialogue is generally thought to mediate memory consolidation, which is crucial for engram function, how it works remains largely unknown. Here, we examined the interplay of neural signals from the retrosplenial cortex (RSC), a neocortical region, and from the hippocampus in memory consolidation by simultaneously recording sharp-wave ripples (SWRs) of dorsal hippocampal CA1 and neural signals of RSC in free-moving mice during the delayed spatial alternation task (DSAT) and subsequent sleep. Hippocampal-RSC coordination during SWRs was identified in nonrapid eye movement (NREM) sleep, reflecting neural reactivation of decision-making in the task, as shown by a peak reactivation strength within SWRs.
View Article and Find Full Text PDFImage-Based Auto-Focus Microscope System with Visual Servo Control for Micro-Stereolithography.
Micromachines (Basel)
October 2024
State Key Laboratory of Tribology in Advanced Equipment, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
Micro-stereolithography (μSL) is an advanced additive manufacturing technique that enables the fabrication of highly precise microstructures with fine feature resolution. One of the primary challenges in μSL is achieving and maintaining precise focus throughout the fabrication process. For the successful application of μSL, it is essential to maintain the sample surface within a focal depth of several microns.
View Article and Find Full Text PDF1 × 2 Graphene Surface Plasmon Waveguide Beam Splitter Based on Self-Imaging.
Nanomaterials (Basel)
September 2024
School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
Based on the principle of self-imaging, a 1 × 2 graphene waveguide beam splitter is proposed in this work, which can split the graphene surface plasmons excited by far-infrared light. The multimode interference process in the graphene waveguide is analyzed by guided-mode propagation analysis (MPA), and then the imaging position is calculated. The simulation results show that the incident beam can be obviously divided into two parts by the self-imaging of the graphene surface plasmon.
View Article and Find Full Text PDFSpontaneous Formation of Altermagnetism from Orbital Ordering.
Phys Rev Lett
June 2024
Technical University of Munich, TUM School of Natural Sciences, Physics Department, TQM, 85748 Garching, Germany.
Altermagnetism has emerged as a third type of collinear magnetism. In contrast to standard ferromagnets and antiferromagnets, altermagnets exhibit extra even-parity wave spin order parameters resulting in a spin splitting of electronic bands in momentum space. In real space, sublattices of opposite spin polarization are anisotropic and related by rotational symmetry.
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