Abstract
This work shows that a strongly correlated phase which is gapped to collective spin excitations but gapless to charge fluctuations emerges as a universal feature in one-dimensional fermionic systems obeying certain discrete symmetries whenever one pair of spin-degenerate subbands is occupied and an arbitrarily weak spin-orbit interaction is present. This general result is independent of the details of the one-dimensional confinement, the fermionic spin, or nature of the spin-orbit interaction. In narrow-gap semiconductors, this gap may be of order 10 μeV. This strongly correlated phase may be identified both via an anomalous h/2e flux periodicity in Aharonov-Bohm oscillations and 2e periodic Coulomb blockade, features which reflect the existence of fermionic pairing despite the absence of superconductivity and the repulsive nature of the interaction.
| Original language | English |
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| Article number | 155309 |
| Journal | Physical Review B |
| Volume | 100 |
| Issue number | 15 |
| Number of pages | 6 |
| ISSN | 2469-9950 |
| DOIs | |
| Publication status | Published - 25 Oct 2019 |