Observing separate spin and charge Fermi seas in a strongly correlated one-dimensional conductor.
Authors
Jin, Yiqing
Moreno, María
Anthore, Anne
Tan, Wooi Kiat
Publication Date
2022-06-17Journal Title
Sci Adv
ISSN
2375-2548
Publisher
American Association for the Advancement of Science (AAAS)
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Vianez, P. M., Jin, Y., Moreno, M., Anirban, A. S., Anthore, A., Tan, W. K., Griffiths, J. P., et al. (2022). Observing separate spin and charge Fermi seas in a strongly correlated one-dimensional conductor.. Sci Adv https://doi.org/10.1126/sciadv.abm2781
Abstract
An electron is usually considered to have only one form of kinetic energy, but could it have more, for its spin and charge, by exciting other electrons? In one dimension (1D), the physics of interacting electrons is captured well at low energies by the Tomonaga-Luttinger model, yet little has been observed experimentally beyond this linear regime. Here, we report on measurements of many-body modes in 1D gated wires using tunneling spectroscopy. We observe two parabolic dispersions, indicative of separate Fermi seas at high energies, associated with spin and charge excitations, together with the emergence of two additional 1D "replica" modes that strengthen with decreasing wire length. The interaction strength is varied by changing the amount of 1D intersubband screening by more than 45%. Our findings not only demonstrate the existence of spin-charge separation in the whole energy band outside the low-energy limit of the Tomonaga-Luttinger model but also set a constraint on the validity of the newer nonlinear Tomonaga-Luttinger theory.
Keywords
cond-mat.mes-hall, cond-mat.mes-hall, cond-mat.str-el, physics.app-ph, quant-ph
Sponsorship
Engineering and Physical Sciences Research Council (EP/K004077/1)
Engineering and Physical Sciences Research Council (EP/J01690X/1)
Engineering and Physical Sciences Research Council (EP/D008506/1)
EPSRC (1948695)
Deutsche Forschungsgemeinschaft (461313466)
Identifiers
External DOI: https://doi.org/10.1126/sciadv.abm2781
This record's URL: https://www.repository.cam.ac.uk/handle/1810/338262
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