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Published on: March 24, 2019
Disentangle Intertwined Interactions in Correlated Charge Density Wave with Magnetic Impurities
Jae Whan Park1, Hyeonjung Kim1,2, Han Woong Yeom1,2
1Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Republic of Korea.
Individual iron (Fe) atoms on 1T-TaS2 reveal site-specific interactions within cluster-Mott charge density-wave (CDW) states. Orbital hybridization, particularly Fe 3d with Ta 5d, influences Mott insulating behavior, offering new control over quantum phenomena.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
- Surface Science
Background:
- Magnetic impurities probe quantum phenomena in strongly correlated systems.
- Site-specific interactions of impurities with broken symmetries were poorly understood.
Purpose of the Study:
- Investigate Fe adatom behavior on cluster-Mott charge density-wave (CDW) 1T-TaS2.
- Elucidate microscopic mechanisms of site-specific impurity interactions.
Main Methods:
- Scanning tunneling microscopy/spectroscopy (STM/STS).
- Density functional theory (DFT) calculations.
Main Results:
- Observed site-dependent electronic states of CDW clusters with Fe adatoms.
- Identified three interaction types: hybridization, CDW distortion, and charge transfer.
- Fe 3d and Ta 5d orbital hybridization suppressed the Mott insulating state at the cluster center.
Conclusions:
- Direct orbital hybridization is crucial, challenging single-site Kondo impurity models.
- Site-specific interactions can be controlled in cluster-Mott insulators.
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