S. McKeown Walker
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
S. McKeown Walker has a total of 20 co-authors. Here are the top co-authors by number of shared publications:
A. Hunter
Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
1 shared publication- Alberto de la Torre
Northeastern University
1 shared publication - Anna Tamai
Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
1 shared publication - Craig M. Polley
MAX IV Laboratory, Lund University, Lund, Sweden
1 shared publication E. Cappelli
Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
1 shared publication- Felix Baumberger
Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
1 shared publication
Latest Publications
- Open Access
- 3 October 2025
- Published by Springer Nature in npj Quantum Materials
- Vol. 10 (1) , 1-7
Fermi surface and pseudogap in highly doped Sr2IrO4
The fate of the Fermi surface in bulk electron-doped Sr2IrO4 remains elusive, as does the origin and extension of its pseudogap phase. Here, we use high-resolution angle-resolved photoelectron spectroscopy (ARPES) to investigate the electronic structure of Sr2−x La x IrO4 up to x = 0.2, a factor of two higher than in previous work. We find that the antinodal pseudogap persists up to the highest doping level, and thus beyond the sharp increase in Hall carrier density to ≃ 1 + x recently observed above x* ≃ 0.161. This suggests that doped iridates host a unique phase of matter in which a large Hall density coexists with an anisotropic pseudogap, breaking up the Fermi surface into disconnected arcs. The temperature boundary of the pseudogap is T* ≃ 200 K for x = 0.2, comparable to cuprates and to the energy scale of short range antiferromagnetic correlations in cuprates and iridates.
- 3 October 2025
- Published by Springer Nature in npj Quantum Materials
- Vol. 10 (1) , 1-7
Open AccessFermi surface and pseudogap in highly doped Sr2IrO4
The fate of the Fermi surface in bulk electron-doped Sr2IrO4 remains elusive, as does the origin and extension of its pseudogap phase. Here, we use high-resolution angle-resolved photoelectron spectroscopy (ARPES) to investigate the electronic structure of Sr2−x La x IrO4 up to x = 0.2, a factor of two higher than in previous work. We find that the antinodal pseudogap persists up to the highest doping level, and thus beyond the sharp increase in Hall carrier density to ≃ 1 + x recently observed above x* ≃ 0.161. This suggests that doped iridates host a unique phase of matter in which a large Hall density coexists with an anisotropic pseudogap, breaking up the Fermi surface into disconnected arcs. The temperature boundary of the pseudogap is T* ≃ 200 K for x = 0.2, comparable to cuprates and to the energy scale of short range antiferromagnetic correlations in cuprates and iridates.