Symmetry-protected spin gaps in quantum wires

Tommy Li

doi:10.1103/PhysRevB.100.155309

Symmetry-protected spin gaps in quantum wires

Tommy Li

Faststoffysik

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.

Originalsprog	Engelsk
Artikelnummer	155309
Tidsskrift	Physical Review B
Vol/bind	100
Udgave nummer	15
Antal sider	6
ISSN	2469-9950
DOI	https://doi.org/10.1103/PhysRevB.100.155309
Status	Udgivet - 25 okt. 2019

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10.1103/PhysRevB.100.155309

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N2 - 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.

AB - 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.

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ER -

Symmetry-protected spin gaps in quantum wires

Abstract

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