Hot-electron dynamics in oxide heterostructures

ORAL

Abstract

The behavior of hot electrons has potential to provide useful insight in the dynamics of strongly correlated electron systems, but it is inherently challenging as an experimental probe due to rapid relaxation (typically on the order of femtoseconds) within very short length scales (typically few nanometers). The hot-electron transistor (HET) provides a unique measurement geometry for this purpose, where the (correlated) metal base can be studied by vertically setting the transport length scale comparable to the hot-electron mean free path. Here we use the HET to probe the evolution of vertical hot-electron transport across oxide heterostructures with a metallic SrRuO3 (SRO) base, well-known for ‘badly metallic’ behavior as a consequence of intermediate electron-correlations. We observe an abrupt increase of the hot-electron mean free path as a function of decreasing temperature at the ferromagnetic transition. Furthermore, we present results on the anisotropic scattering of hot-electrons as a function of the magnetization orientation deep in the ferromagnetic state.

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Presenters

  • Brian Kim

    Department of Electrical Engineering, Stanford University, Stanford, CA, United States, Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford Univ

Authors

  • Brian Kim

    Department of Electrical Engineering, Stanford University, Stanford, CA, United States, Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford Univ

  • Yasuyuki Hikita

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SLAC National Accelerator Laboratory, Stanford institute for materials energy sciences, SLAC National accelerator Laboratory

  • Di Lu

    Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University

  • Adrian Swartz

    Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University

  • Hyeok Yoon

    Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University

  • Harold Hwang

    Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, CA, United States, Stanford Institute for Materials and Energy Science, Department of Applied Physics, Stanford University, Department of Applied Physics, Geballe Laboratory for Advanced Materials, Stanford Institute for Materials and Energy Sciences, Stanford University, SLAC National Accelerator, Applied Physics, Stanford University, Stanford Univ, Stanford University, Stanford Univeristy