Renormalized Landau quasiparticle dispersion revealed by photoluminescence spectra from a two-dimensional Fermi liquid at the MgZnO/ZnO heterointerface

We analyze the low-temperature photoluminescence spectra from two-dimensional electron systems (2DESs) confined at MgxZn1−xO/ZnO heterojunctions as the electron density is decreased from 2.3×1012 to 3.5×1011 cm−2. The value of the quasiparticle optical density-of-states mass is directly extracted fr...

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Bibliographic Details
Published in:Physical review. B 2017-09, Vol.96 (11), Article 115131
Main Authors: Solovyev, V. V., Kukushkin, I. V.
Format: Article
Language:English
Subjects:
Density of states
Electron density
Electron mass
Elementary excitations
Fermi liquids
Heterojunctions
Interaction parameters
Low temperature
Optical density
Photoluminescence
Zinc oxide
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Summary:We analyze the low-temperature photoluminescence spectra from two-dimensional electron systems (2DESs) confined at MgxZn1−xO/ZnO heterojunctions as the electron density is decreased from 2.3×1012 to 3.5×1011 cm−2. The value of the quasiparticle optical density-of-states mass is directly extracted from the width of the 2DES photoluminescence band and is shown to renormalize and double from the value close to that of bulk ZnO material, 0.3m0 (m0 is the bare electron mass), to 0.6m0 due to electron-electron interactions as the interaction parameter rs increases from 2.4 to 6.5. The experimentally probed quasiparticle energies far exceed the limits of Landau's Fermi-liquid theory.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.115131