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In the current work, we develop a deep-learning interatomic potential for YH2 trained on AIMD data, enabling large-scale classical molecular dynamics simulations to elucidate the microscopic details of this cooperative mechanism. Our simulations reproduce and extend the AIMD predictions, capturing an order\u2013disorder transition at a characteristic temperature of T\u03b1 \u223c800\u00a0K accompanied by quasi-one-dimensional, string-like hydrogen displacements. A second crossover at T\u03bb \u223c 950\u00a0K denotes the superionic-like transition, which coincides with a discernible peak in the specific heat capacity. We show that above T\u03b1, the hydrogen atoms, which are constrained within the yttrium lattice, exhibit spatially heterogeneous dynamics, manifested as distinct regions of slow- and fast-moving atoms. Further analysis establishes a buildup of dynamic heterogeneity that peaks above T\u03b1 and gradually diminishes beyond T\u03bb. The progression of dynamic heterogeneity in YH2 shows a remarkable similarity to that of fluorites with a close-packed structure and establishes YH2 as a Type II superionic-like conductor at high temperatures. Our work opens new avenues for exploring superionic-like transport in metal hydrides, a class of materials in which such behavior has remained largely unexplored.<\/jats:p>","DOI":"10.1063\/5.0338587","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T11:31:37Z","timestamp":1790595097000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Heterogeneous dynamics in yttrium dihydride with deep learning potential"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-6806-1760","authenticated-orcid":false,"given":"Yuqing","family":"Huang","sequence":"first","affiliation":[{"name":"Department of Nuclear Engineering, North Carolina State University 1 , Raleigh, North Carolina 27695,","place":["USA"]},{"name":"Center for Nanoscale Materials, Argonne National Laboratory 2 , Lemont, Illinois 60439,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianguo","family":"Yu","sequence":"additional","affiliation":[{"name":"Fuels Modeling and Simulation Department, Idaho National Laboratory 3 , Idaho Falls, Idaho 83402,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4626-8515","authenticated-orcid":false,"given":"M. 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