Dichotomous Temperature Response in the Electronic Structure of Epitaxially Grown Altermagnet MnTe
Year: 2025
Type: article
Abstract: The altermagnet candidate MnTe has recently gained significant interest due to its unconventional magnetic ordering. One of the key features of altermagnetism is the momentum-dependent spin-split band and its temperature-dependent evolution. Yet a fully momentum-resolved experimental investigation, including out-of-plane direction, is still lacking. Here, we systematically investigate the electronic structure of epitaxially grown MnTe by using angle-resolved photoemission spectroscopy (ARPES). Our photon-energy-dependent ARPES data reveal significant out-of-plane dispersions consistent with previous theoretical calculations. More interestingly, we identify two distinct temperature-dependent electronic band structure evolutions at different out-of-plane momentum positions: momentum-dependent energy shifts at the nodal plane and substantial spectral weight suppression at the off-nodal plane. These findings may suggest the importance of considering both the itinerant and localized nature of the magnetic ordering and momentum-dependent interactions. Our work provides crucial insights into the complex correlation between momentum, temperature, and electronic structure in MnTe, contributing to a deeper understanding of altermagnetism.
Source: Nano Letters
Institutions: Pohang University of Science and Technology, Lawrence Berkeley National Laboratory, Advanced Light Source, Max-Planck-POSTECH Center for Complex Phase Material, SLAC National Accelerator Laboratory, Stanford University, Monash University, Melbourne Centre for Nanofabrication, Australian National Fabrication Facility, Pusan National University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Funders: U.S. Department of Energy, National Research Foundation, Pohang University of Science and Technology, Korea Basic Science Institute, National Research Foundation of Korea, Ministry of Science and ICT, South Korea, Australian Research Council, Basic Energy Sciences, Lawrence Berkeley National Laboratory, Division of Materials Sciences and Engineering, Advanced Light Source
Awards: G1079818582, G1286236842, G1286251239, G2127231547, G2371548206, G237429762, G248902062, G2810384502, G303061748, G30714459, G3083819904, G3702897590, G3812690899, G3846980675, G3884951186, G4402704772, G4429025965, G4662524992, G469631764, G5396274858, G5570207115, G5676588999, Kagome metals: From Japanese basket to next generation electronic devices, G6448341809, G650090426, G6550344761, G7283024673, G7354628648, G791371132, G911061179, G968731831, G969889393
OpenAlex ID: W4410499000