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- W3211322511 abstract "Determining the (bare) electron mass $m_0$ in crystals is often hindered by many-body effects since Fermi-liquid physics renormalises the band mass, making the observed effective mass $m^*$ depend on density. Here, we use a one-dimensional (1D) geometry to amplify the effect of interactions, forcing the electrons to form a nonlinear Luttinger liquid with separate holon and spinon bands, therefore separating the interaction effects from $m_0$. Measuring the spectral function of gated quantum wires formed in GaAs by means of magnetotunnelling spectroscopy and interpreting them using the 1D Fermi-Hubbard model, we obtain $m_0=(0.0525pm0.0015)m_textrm{e}$ in this material, where $m_textrm{e}$ is the free-electron mass. By varying the density in the wires, we change the interaction parameter $r_textrm{s}$ in the range from $sim$1-4 and show that $m_0$ remains constant. The determined value of $m_0$ is $sim 22$% lighter than observed in GaAs in geometries of higher dimensionality $D$ ($D>1$), consistent with the quasi-particle picture of a Fermi liquid that makes electrons heavier in the presence of interactions." @default.
- W3211322511 created "2021-11-08" @default.
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- W3211322511 date "2023-03-13" @default.
- W3211322511 modified "2023-10-14" @default.
- W3211322511 title "Decoupling of the many-body effects from the electron mass in GaAs by means of reduced dimensionality" @default.
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- W3211322511 doi "https://doi.org/10.1103/physrevb.107.115128" @default.
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