Hydrogen-induced modification of the local charge density in MnSb2Te4
Kyriaki Samioti, Weiyan Qi, Stefano Ponzoni, Antonio Salame, Entela Buzi, Afrin Nahar Tamanna, Ayesha Lakra, Steven Francis Udaundo, Ding Pei, Pavel Dudin, Marta Zonno, François Bertran, Amina Taleb-Ibrahimi, Lia Krusin-Elbaum, Luca Perfetti, Evangelos Papalazarou, Marino Marsi
Abstract
We investigate the effects of ionic hydrogen (H+) intake on the occupied and unoccupied states of MnSb2Te4, a van der Waals magnetic material. Using angle-resolved photoemission spectroscopy (ARPES) and time-resolved ARPES, combined with resonant and core level photoemission, we reveal that hydrogen binds near specific lattice sites, locally redistributing charge density and reshaping the valence band spectral weight. While the band gap and picosecond carrier dynamics show only minor changes upon hydrogenation, the conduction band exhibits a striking stoichiometry-dependent response. These findings indicate that hydrogen interacts strongly with the intrinsic defects in the lattice, acting as a selective dopant in MnSb2Te4. Our work provides a spectroscopic basis for using hydrogen as a tool for the control of the electronic and magnetic properties in layered 2D materials.
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