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Observation of Discrete Conventional Caroli–de Gennes–Matricon States in the Vortex Core of Single-Layer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>FeSe</mml:mi><mml:mo>/</mml:mo><mml:msub><mml:mrow><mml:mi>SrTiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Using low-temperature scanning tunneling microscopy (STM), we studied the vortex states of single-layer FeSe film on a ${\mathrm{SrTiO}}_{3}$ (100) substrate, and the local behaviors of superconductivity at sample boundaries. We clearly observed multiple discrete Caroli--de Gennes--Matricon states in the vortex core, and quantitative analysis shows their energies well follow the …