| 発表者名 |
鈴木 大吾 |
| 指導教員名 |
石坂 香子 教授 |
| 発表題目（英語） |
Direct Observation of Ultra flat band in Van der Waals Kagome Matter Pd 3P2S8 |
| 要旨（英語） |
With the advanced investigations into low-dimensional systems, it has become essential to find materials having interesting lattices that can be exfoliated down to monolayer. One particular important structure is a kagome lattice with its potentially diverse and vibrant physics. Pd3P2S8 is a non-magnetic layered semiconductor (optical gap: ~2 eV) in which Pd atoms form a Kagome lattice, and the fabrication of single-layer flakes by tape peeling was reported in 2020. On the other hand, the bandwidth of the single layer has been calculated to be ~2 eV. In the band calculation of a single layer, a flat band with extremely narrow bandwidth (Ultra-Flat Band) is expected to appear isolated at the top of the valence band, and a strong modulation of the electronic structure by atomic layering is expected. In this study, we will directly observe the “Ultra flat band” by microscopic synchrotron radiation ARPES of single-layer flake samples, and also perform ARPES of multi-layer flake/bulk samples to investigate the difference in electronic structure from that of single-layer samples. |
| 発表言語 |
日本語 |
