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Strain-tunable spin-valley polarization and high thermoelectric performance in a two-dimensional Ca(CoN)2 altermagnet

M. BouzidiDepartment of Physics, College of Science, University of Ha'il, P.O. Box 2440, Ha'il, Saudi ArabiaSalhah Hamed AlrefaeeDepartment of Chemistry College of Science Taibah University Yanbu Governorate Saudi ArabiaTatyana OrlovaDepartment of Physics and Its Teaching Methods, National Pedagogical University of Uzbekistan, Tashkent, UzbekistanAeshah AlrubayyiDepartment of Science and Technology, University College at Nairiyah, University of Hafr Al Batin (UHB), Nairiyah 31981, Saudi ArabiaVineet TirthCentre for Engineering and Technology Innovations, King Khalid University, Abha 61421, Aseer, Kingdom of Saudi ArabiaAli AlgahtaniMechanical Engineering Department, College of Engineering, King Khalid University, Abha 61421, Aseer, Kingdom of Saudi ArabiaTawfiq Al-MughanamDepartment of Mechanical Engineering, College of Engineering, King Faisal University, P. O. Box 380, Al-Ahsa 31982, Kingdom of Saudi ArabiaNaseem AkhterDepartment of Physics, College of Science, Qassim University, Buraydah-51452, Saudi ArabiaAbid ZamanDepartment of Physics, Riphah International University Islamabad 44000, Pakistan

Case Studies in Thermal Engineeringjournal2026en

ABI

Annotatsiya

Altermagnets represent a recently discovered class of magnetic materials that combine fully compensated magnetic order with nonrelativistic spin-split electronic bands, enabling unique charge, spin, and valley transport properties. Here, using first-principles calculations, we systematically investigate the structural, electronic, thermoelectric, valleytronic, and piezoelectric properties of monolayer Ca(CoN) 2 . The system is found to be intrinsically altermagnetic and semiconducting with a direct band gap of 0.432 eV and symmetry-protected degenerate valleys at the X and Y points. High carrier mobility and a large Seebeck coefficient (∼1.3 mV K -1 at 300 K) lead to an excellent thermoelectric performance, with a maximum ZT of 1.8 at 500 K under hole doping. Uniaxial strain efficiently lifts the valley degeneracy, generating a sizable spin-valley polarization with a valley splitting of up to 112 meV at 4% strain. Additionally, the monolayer possesses high piezoelectricity having d 31 of 1.18 pm/V. The results show Ca(CoN)2 is a promising multifunctional material. It is suitable for future thermoelectric, valleytronic, and piezo-spintronic applications.

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Mavzular

Heusler alloys: electronic and magnetic properties 2D Materials and Applications Advanced Thermoelectric Materials and Devices

Identifikatorlar

DOI: 10.1016/j.csite.2026.107737

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