Realization of epitaxial NbP and TaP Weyl semimetal thin films

Bedoya-Pinto, Amilcar; Pandeya, Avanindra Kumar; Liu, Defa; Deniz, Hakan; Chang, Kai; Tan, Hengxin; Han, Hyeon; Jena, Jagannath; Kostanovskiy, Ilya; Parkin, Stuart S. P.

doi:10.1021/acsnano.9b09997

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Realization of epitaxial NbP and TaP Weyl semimetal thin films

MPS-Authors

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Bedoya-Pinto, Amilcar
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons260876

Pandeya, Avanindra Kumar
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons260868

Liu, Defa
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Deniz, Hakan
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

Chang, Kai
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

Tan, Hengxin
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons260920

Han, Hyeon
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons260283

Jena, Jagannath
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons260841

Kostanovskiy, Ilya
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons245678

Parkin, Stuart S. P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Citation

Bedoya-Pinto, A., Pandeya, A. K., Liu, D., Deniz, H., Chang, K., Tan, H., et al. (2020). Realization of epitaxial NbP and TaP Weyl semimetal thin films. ACS Nano, 14(4), 4405-4413. doi:10.1021/acsnano.9b09997.

Cite as: https://hdl.handle.net/21.11116/0000-0008-B6AA-B

Abstract

Weyl semimetals (WSMs) exhibit an electronic structure governed by linear band dispersions and degenerate (Weyl) points that lead to exotic physical phenomena. While WSMs were established in bulk monopnictide compounds several years ago, the growth of thin films remains a challenge. Here, we report the bottom-up synthesis of single-crystalline NbP and TaP thin films, 9 to 70 nm thick, by means of molecular beam epitaxy. The as-grown epitaxial films feature a phosphorus-rich stoichiometry, a tensile-strained unit cell, and a homogeneous surface termination, unlike their bulk crystal counterparts. These properties result in an electronic structure governed by topological surface states as directly observed using in situ momentum photoemission microscopy, along with a Fermi-level shift of -0.2 eV with respect to the intrinsic chemical potential. Although the Fermi energy of the as-grown samples is still far from the Weyl points, carrier mobilities close to 10³ cm²/(V s) have been measured at room temperature in patterned Hall-bar devices. The ability to grow thin films of Weyl semimetals that can be tailored by doping or strain, is an important step toward the fabrication of functional WSM-based devices and heterostructures.