Journal
PHYSICAL REVIEW B
Volume 104, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L060101
Keywords
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Funding
- National Natural Science Foundation of the People's Republic of China [11974211, 11974212]
- Qilu Young Scholar Program of Shandong University
- Taishan Scholar Program of Shandong Province
- NSF/EPSCoR RII Track-1: Emergent Quantum Materials and Technologies [OIA-2044049]
- NSF MRSEC [DMR-1420645]
- Taishan Scholar Program of Shandong Province [tsqn201812045]
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The proposal of energy band engineering as a means to enhance tunneling electroresistance in ferroelectric tunnel junctions shows promising results in controlling the conductance states depending on the polarization orientation. This approach involves the use of an ultrathin dielectric layer with a smaller band gap embedded in the ferroelectric barrier layer, leading to a giant ON/OFF conductance ratio for potential device applications.
We propose energy band engineering to enhance tunneling electroresistance (TER) in ferroelectric tunnel junctions (FTJs). We predict that an ultrathin dielectric layer with a smaller band gap, embedded into a ferroelectric barrier layer, acts as a switch controlling high- and low-conductance states of an FTJ depending on polarization orientation. Using first-principles modeling based on density functional theory, we investigate this phenomenon for a prototypical SrRuO3/BaTiO3/SrRuO3 FTJ with a BaSnO3 monolayer embedded in the BaTiO3 barrier. We show that in such a composite-barrier FTJ, ferroelectric polarization of BaTiO3 shifts the conduction-band minimum of the BaSnO3 monolayer above or below the Fermi energy depending on polarization orientation. The resulting switching between direct and resonant tunneling leads to a TER effect with a giant ON/OFF conductance ratio. The proposed resonant band engineering of FTJs can serve as a viable tool to enhance their performance, useful for device applications.
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