Observing separate spin and charge Fermi seas in a strongly correlated one-dimensional conductor
| Autor: | Pedro M. T. Vianez, Yiqing Jin, María Moreno, Ankita S. Anirban, Anne Anthore, Wooi Kiat Tan, Jonathan P. Griffiths, Ian Farrer, David A. Ritchie, Andrew J. Schofield, Oleksandr Tsyplyatyev, Christopher J. B. Ford |
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| Přispěvatelé: | Vianez, Pedro MT [0000-0003-2245-6108], Anirban, Ankita S [0000-0002-9294-3115], Griffiths, Jonathan P [0000-0002-6933-7707], Farrer, Ian [0000-0002-3033-4306], Ritchie, David A [0000-0002-9844-8350], Schofield, Andrew J [0000-0002-1218-8560], Tsyplyatyev, Oleksandr [0000-0002-2081-6547], Ford, Christopher JB [0000-0002-4557-3721], Apollo - University of Cambridge Repository |
| Rok vydání: | 2022 |
| Předmět: |
Quantum Physics
Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Strongly Correlated Electrons (cond-mat.str-el) FOS: Physical sciences Physics - Applied Physics Applied Physics (physics.app-ph) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter - Strongly Correlated Electrons quant-ph Mesoscale and Nanoscale Physics (cond-mat.mes-hall) cond-mat.mes-hall Condensed Matter::Strongly Correlated Electrons cond-mat.str-el Quantum Physics (quant-ph) physics.app-ph |
| Zdroj: | Science Advances |
| Popis: | 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 tunnelling 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 effective interaction strength is varied by changing the amount of 1D inter-subband screening by over 45%. Our findings demonstrate the existence of spin-charge separation in the whole energy band outside the low-energy limit of validity of the Tomonaga-Luttinger model, and also set a constraint on the validity of the newer nonlinear Tomonaga-Luttinger theory. Comment: 51 pages, 14 figures |
| Databáze: | OpenAIRE |
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