| Autor: |
Kurzmann, A., Eich, M., Overweg, H., Mangold, M., Herman, F., Rickhaus, P., Pisoni, R., Lee, Y., Garreis, R., Tong, C., Watanabe, K., Taniguchi, T., Ensslin, K., Ihn, T. |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. Lett. 123, 026803 (2019) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.123.026803 |
| Popis: |
We report on ground- and excited state transport through an electrostatically defined few-hole quantum dot in bilayer graphene in both parallel and perpendicular applied magnetic fields. A remarkably clear level scheme for the two-particle spectra is found by analyzing finite bias spectroscopy data within a two-particle model including spin and valley degrees of freedom. We identify the two-hole ground-state to be a spin-triplet and valley-singlet state. This spin alignment can be seen as Hund's rule for a valley-degenerate system, which is fundamentally different to quantum dots in carbon nano tubes and GaAs-based quantum dots. The spin-singlet excited states are found to be valley-triplet states by tilting the magnetic field with respect to the sample plane. We quantify the exchange energy to be 0.35meV and measure a valley and spin g-factor of 36 and 2, respectively. |
| Databáze: |
arXiv |
| Externí odkaz: |
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