The Science behind the research
Electronic transport in dimensions below three can have unique properties, often driven by enhanced densities of states at the chemical potential. Not only is the transport inherently anisotropic but also exotic properties like spin-density waves and spin/charge separation have been observed.
Ongoing research
We are interested in two materials K0.3MoO3 (blue bronze) and La-doped Sr2IrO4 [see publication below]. Blue bronze is a 1D conductor that is predicted to have spinon and holon excitations (as in a Luttinger liquid) that we hope to observe with neutron scattering and Sr2IrO4 is a 2D antiferromagnet with pseudogaps excitations very similar to the cuprate high temperature superconductors.
Figure 1 below shows (a) an Experimental Fermi surface of (Sr0.935La0.065)3Ir2O7 taken with hν=83 eV at 8 K. We denote the (π,0) point of the two-dimensional Ir sublattice by X and the (π/2,π/2) point by M. (b),(c) Photoemission intensity along the ΓM and ΓX high symmetry directions, respectively. (d) Stack of energy distribution curves around the Fermi surface extracted from the data shown in panel (b).
Fig 1. Low energy excitations in lightly doped Sr3Ir2O7 measured by Angle Resolved Photoemission Spectroscopy (ARPES) at Diamond, Harwell. |
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Recent Publications
- Coherent Quasiparticles with a Small Fermi Surface in Lightly Doped Sr3Ir2O7, de la Torre et al. Physical Review Letters 113, 256402 (2014)