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Spin Andreev-like reflection in metal-Mott insulator heterostructures
K A Al-Hassanieh1, Julián Rincón2, G Alvarez3
1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Physical Review Letters
|February 28, 2015
Summary
We predict and confirm a novel spin Andreev reflection in metal-Mott insulator heterostructures, analogous to electron-hole pairing in superconductors. This finding offers insights into antiferromagnetic proximity effects.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Spintronics
Background:
- Andreev reflection is a key phenomenon at metal-superconductor interfaces, involving electron-hole pair formation.
- The Hubbard model describes interacting electrons in materials, with known electron-hole transformations for single spin species.
Purpose of the Study:
- To investigate the time evolution of electron wave packets in 1D metal-superconductor heterostructures.
- To predict and numerically confirm a novel spin Andreev reflection in metal-Mott insulator heterostructures.
- To explore the underlying physics and potential experimental realizations of this spin reflection phenomenon.
Main Methods:
- Utilizing the time-dependent density-matrix renormalization group (tDMRG) for simulating quantum systems.
- Analyzing the time evolution of electron wave packets in one-dimensional heterostructures.
- Applying electron-hole transformation concepts from the Hubbard model.
Main Results:
- Observed expected Andreev reflection at metal-superconductor interfaces.
- Predicted and numerically confirmed analogous spin Andreev reflection at metal-Mott insulator interfaces.
- Developed an intuitive model for spin reflection, similar to traditional Andreev reflection.
Conclusions:
- Spin Andreev reflection is a viable phenomenon in metal-Mott insulator heterostructures.
- The effect is expected to extend to higher dimensions and more complex Hamiltonians.
- This work introduces a novel antiferromagnetic proximity effect with potential experimental applications.
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