429 papers
The subatomic world is a realm where matter behaves in ways that defy our everyday intuition, and this category explores the fundamental building blocks of our universe. From the intricate dance of quarks inside a proton to the strange properties of electrons, these studies reveal the deep rules that govern everything from the smallest particles to the largest stars.
At Gist.Science, we track every new preprint in this field as it appears on arXiv, ensuring you stay ahead of the curve. For each discovery, we provide both a clear, plain-language explanation of the core ideas and a detailed technical summary for those who want to dive deeper into the mathematics and methodology.
Below are the latest papers in Atom-Ph, offering fresh insights into the structure and behavior of the atomic scale.
This paper demonstrates the first excitation of the thorium-229 nuclear transition using a continuous-wave laser in absorption mode, a breakthrough that enables fast signal acquisition for solid-state nuclear clocks and reveals a highly symmetric crystal center with minimal electric field gradients.
This paper demonstrates the experimental synthesis and coherent manipulation of magnetically insensitive qubits within the metastable D₃/2 manifold of trapped ¹³⁸Ba⁺ ions, achieving a threefold improvement in coherence time (T₂*) compared to traditional ground-state encodings.
This paper reports experimental observations and theoretical calculations of both intrastate and interstate facilitation effects among high-lying , , and Rydberg states in rubidium, demonstrating enhanced off-resonant excitation and correlated atom numbers consistent with repulsive and attractive Rydberg-Rydberg interactions.
Using pump-probe ejection spectroscopy on 39K Bose-Einstein condensates, researchers observed significant low-energy spectral weight below the standard Bose polaron peak that, while consistent with both dressed impurity and bipolaron theoretical models, is best explained by the formation of bipolaron states due to attractive interactions mediated by the condensate.
This paper reports the successful preparation of a quasi-two-dimensional heteronuclear quantum degenerate mixture of ultracold Na and Rb atoms using a versatile experimental apparatus, demonstrating quantum immiscibility that aligns with mean-field theories and establishing a platform for future low-dimensional quantum studies.
This paper presents a coherent terahertz-to-optical conversion scheme in warm rubidium vapor that enables phase-resolved tomographic imaging of terahertz fields, allowing for the reconstruction of complex field amplitudes and the identification of incident angles at room temperature.
This paper analyzes the rovibrational spectrum of hydrogen and antihydrogen molecular ions within a low-energy effective theory to demonstrate that these systems offer enhanced sensitivity to Lorentz and CPT violation in the proton sector—scaling as compared to atomic transitions—thereby providing a promising avenue for high-precision tests of fundamental symmetries.
This paper extends a previous analysis of Lorentz and CPT violation in hydrogen and antihydrogen molecular ions by incorporating spin-dependent operators to derive constraints on symmetry-violating couplings from the full hyperfine-Zeeman spectrum under an applied magnetic field.
This paper presents a comprehensive derivation of the rovibrational spectrum for hydrogen and antihydrogen molecular ions within the non-minimal Standard-Model Extension, demonstrating how high-precision spectroscopy of these systems can test Lorentz and CPT symmetry with sensitivities up to by analyzing quantum number dependencies and temporal variations.
This chapter explains the origins and significance of the proton radius puzzle, which arose from a discrepancy between muonic and electronic hydrogen measurements suggesting a potential violation of lepton universality, and presents recent experimental results that have successfully resolved the issue.