journal article·2021-09-28Open access

Mitrofanovite Pt3Te4: A Topological Metal with Termination-Dependent Surface Band Structure and Strong Spin Polarization

Jun Fujii, Barun Ghosh, Ivana Vobornik, Anan Bari Sarkar, Debashis Mondal, Chia-Nung Kuo, François C. Bocquet, Lixue Zhang, Danil W. Boukhvalov, Chin Shan Lue, Amit Agarwal, Antonio Politano

ACS Nano· Volume 15· Issue 9

Abstract

Due to their peculiar quasiparticle excitations, topological metals have high potential for applications in the fields of spintronics, catalysis, and superconductivity. Here, by combining spin- and angle-resolved photoemission spectroscopy, scanning tunneling microscopy/spectroscopy, and density functional theory, we discover surface-termination-dependent topological electronic states in the recently discovered mitrofanovite Pt3Te4. Mitrofanovite crystal is formed by alternating, van der Waals bound layers of Pt2Te2 and PtTe2. Our results demonstrate that mitrofanovite is a topological metal with termination-dependent (i) electronic band structure and (ii) spin texture. Despite their distinct electronic character, both surface terminations are characterized by electronic states exhibiting strong spin polarization with a node at the Γ point and sign reversal across the Γ point, indicating their topological nature and the possibility of realizing two distinct electronic configurations (both of them with topological features) on the surface of the same material.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CNR-IOM, TASC Laboratory, Area Science Park-Basovizza, 34139 Trieste, Italy

Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India

Department of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan

Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei 10601, Taiwan

Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany

Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany

College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, P. R. China

College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, P. R. China

Institute of Physics and Technology, Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia

INSTM and Department of Physical and Chemical Sciences, University of L’Aquila, via Vetoio, 67100 L’Aquila (AQ), Italy

CNR-IMM Istituto per la Microelettronica e Microsistemi, VIII strada 5, I-95121 Catania, Italy

Funding

Science and Engineering Research Board · Deutsche Forschungsgemeinschaft · Ministry of Science and Higher Education of the Russian Federation · National Natural Science Foundation of China · NFFA · Jiangsu Innovative and Entrepreneurial Talents Project

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