Electronic Structure of Two-Dimensional CoO<sub>2</sub>
ORAL
Abstract
The transition metal oxide CoO2 forms layered bulk “pseudo-two-dimensional” structures that exhibit correlated electronic states and a complex interplay between superconductivity and charge/spin ordering. Recently, it has been shown [1] that CoO2 can be stabilized in the single-layer limit. However, little has been known about the single layer’s electronic structure. We have now studied the crystalline and electronic structure of single-layer epitaxial CoO2/Au(111). Angle-resolved photoemission spectroscopy (ARPES) reveals a band structure with parallels to that of the superconducting layered bulk material Na0.35CoO2 ● 1.3H2O. Using x-ray photoelectron diffraction, we have obtained detailed information about the crystal structure, and have used this information as a basis for density functional theory calculations to support the interpretation of our ARPES data. The results emphasize the interest of oxides as a new subject within two-dimensional materials research. They also contribute to our understanding of the electronic properties of layered bulk crystals based on CoO2. [1] ACS Nano 9 (2015) 2445
*VILLUM FONDEN via the Centre of Excellence for Dirac Materials (Grant No. 11744) and VILLUM project grant no. 13264
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Presenters
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Charlotte Sanders
- Artemis Program, UK Central Laser Facility
- Central Laser Facility, Rutherford Appleton Laboratory