الانضغاط يعيد رسم خريطة الإلكترونات سريع

الملخص الأصلي

كما كتبه المؤلفون، بالإنجليزية arXiv:2602.07747

We report a combined study of the low-energy electronic band structure of epitaxial Sr$$_3$$Ru$$_2$$O$$_7$$ films using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT). To investigate the effects of substrate dependence on the band structure, Sr$$_3$$Ru$$_2$$O$$_7$$ thin films are epitaxially grown on SrTiO$$_3$$ (STO) and (LaAlO$$_{3}$$)$$_{0.3}$$(Sr$$_{2}$$TaAlO$$_{6}$$)$$_{0.7}$$ (LSAT) substrates using molecular beam epitaxy. The measured and calculated Fermi-surfaces clearly show substantial changes in the Fermi surface topologies that originate from the underlying strain states. The compressively strained film grown on LSAT exhibits Fermi-surface features consistent with an orthorhombic-like symmetry; and the tensile-strained film grown on STO features a tetragonal-like surface symmetry. In addition, the ARPES data for both films indicate weakly dispersive spectral features within $$\sim15~\text{meV}$$ below the Fermi level. These observations underscore the strong sensitivity of the electronic structure of Sr$$_3$$Ru$$_2$$O$$_7$$ to epitaxial strain and establish a foundation for future efforts to tune correlated phases in this bilayer ruthenate.