| Autor: |
Sara Conti, Andrea Perali, François M. Peeters, David Neilson |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Condensed Matter, Vol 6, Iss 2, p 14 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2410-3896 |
| DOI: |
10.3390/condmat6020014 |
| Popis: |
Superfluidity has been predicted and now observed in a number of different electron-hole double-layer semiconductor heterostructures. In some of the heterostructures, such as GaAs and Ge-Si electron-hole double quantum wells, there is a strong mismatch between the electron and hole effective masses. We systematically investigate the sensitivity to unequal masses of the superfluid properties and the self-consistent screening of the electron-hole pairing interaction. We find that the superfluid properties are insensitive to mass imbalance in the low density BEC regime of strongly-coupled boson-like electron-hole pairs. At higher densities, in the BEC-BCS crossover regime of fermionic pairs, we find that mass imbalance between electrons and holes weakens the superfluidity and expands the density range for the BEC-BCS crossover regime. This permits screening to kill the superfluid at a lower density than for equal masses. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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