Congbing Tan
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View article: Ferroelectric superdomain switching for multi-stage negative capacitance
Ferroelectric superdomain switching for multi-stage negative capacitance Open
Ferroelectric negative capacitance is highly promising for reducing the power consumption of ferroelectric-based devices. However, the bistable nature limits the ferroelectrics that present one negative capacitance effect during ferroelect…
View article: Enhanced phase transformation in BiFeO3 thin films via synergistic pressure and electric field modulation
Enhanced phase transformation in BiFeO3 thin films via synergistic pressure and electric field modulation Open
In complex multi-field application environments, enhancing the rhombohedral/tetragonal (R/T) phase transition in BiFeO3 (BFO) thin films and making more appearances of R/T morphotropic phase boundaries (MPBs) play a key role in improving t…
View article: Symmetry-breaking-engineered in-plane bulk photovoltaic effect in van der Waals WS<sub>2</sub>/CrOCl heterostructure
Symmetry-breaking-engineered in-plane bulk photovoltaic effect in van der Waals WS<sub>2</sub>/CrOCl heterostructure Open
This study constructs a symmetry-breaking interface by stacking WS 2 onto anisotropic CrOCl and observes an in-plane bulk photovoltaic effect with photocurrent anisotropy ratio 3.29, originating from in-plane polarization.
View article: Atomic-Scale Tracking Phase Transition Dynamics of Berezinskii-Kosterlitz-Thouless Polar Vortex-Antivortex
Atomic-Scale Tracking Phase Transition Dynamics of Berezinskii-Kosterlitz-Thouless Polar Vortex-Antivortex Open
Particle-like topologies, such as vortex-antivortex (V-AV) pairs, have garnered significant attention in the field of condensed matter. However, the detailed phase transition dynamics of V-AV pairs, as exemplified by self-annihilation, mot…
View article: Dislocation-tuned ferroelectricity and ferromagnetism of the BiFeO <sub>3</sub> /SrRuO <sub>3</sub> interface
Dislocation-tuned ferroelectricity and ferromagnetism of the BiFeO <sub>3</sub> /SrRuO <sub>3</sub> interface Open
Misfit dislocations at a heteroepitaxial interface produce huge strain and, thus, have a significant impact on the properties of the interface. Here, we use scanning transmission electron microscopy to demonstrate a quantitative unit-cell-…
View article: Dynamics of Polar Skyrmion Bubbles under Electric Fields
Dynamics of Polar Skyrmion Bubbles under Electric Fields Open
Room-temperature polar skyrmions, which have been recently discovered in oxide superlattice, have received considerable attention for their potential applications in nanoelectronics owing to their nanometer size, emergent chirality, and ne…
View article: Dynamics of Polar Skyrmion Bubbles under Electric Fields
Dynamics of Polar Skyrmion Bubbles under Electric Fields Open
Room-temperature polar skyrmion bubbles that are recently found in oxide superlattice, have received enormous interests for their potential applications in nanoelectronics due to the nanometer size, emergent chirality, and negative capacit…
View article: Manipulation of polar vortex chirality in oxide superlattices
Manipulation of polar vortex chirality in oxide superlattices Open
Topological polar vortices that are the electric analogues of magnetic objects, present great potential in applications of future nanoelectronics due to their nanometer size, anomalous dielectric response, and chirality. To enable the func…
View article: Creating topological polar structure in a nonpolar matter
Creating topological polar structure in a nonpolar matter Open
Nontrivial topological structures offer rich playground in condensed matter physics including fluid dynamics, superconductivity, and ferromagnetism, and they promise alternative device configurations for post-Moore spintronics and electron…
View article: Atomic-scale observations of electrical and mechanical manipulation of topological polar flux closure
Atomic-scale observations of electrical and mechanical manipulation of topological polar flux closure Open
Significance Flux-closures, stable topological polar structures of nanometer size, are considered to be promising candidates as elements of future nanoelectronic and electromechanical devices. Understanding their phase transition pathways …
View article: Polar topological structures in ferroelectric materials
Polar topological structures in ferroelectric materials Open
Spin topologies, including flow-closure, vortex, meron, skyrmion and other spin configurations, are usually found in magnetic materials. The emergence of the topological structures will trigger a number of intriguing functionalities and ph…
View article: Subunit cell–level measurement of polarization in an individual polar vortex
Subunit cell–level measurement of polarization in an individual polar vortex Open
We report accurates and informative measurement with subunit cell resolution for local polarization distribution in ferroelectrics.
View article: Characterization of domain distributions by second harmonic generation in ferroelectrics
Characterization of domain distributions by second harmonic generation in ferroelectrics Open
Domain orientations and their volume ratios in ferroelectrics are recognized as a compelling topic recently for domain switching dynamics and domain stability in devices application. Here, an optimized second harmonic generation method has…
View article: Nonlinear optical absorption tuning in Bi3.15Nd0.85Ti3O12 ferroelectric thin films by thickness
Nonlinear optical absorption tuning in Bi3.15Nd0.85Ti3O12 ferroelectric thin films by thickness Open
The tunability of nonlinear optical (NLO) absorption in Bi3.15Nd0.85Ti3O12 (BNT) ferroelectric thin films was investigated through the open aperture Z-scan method with femtosecond laser pulses at the wavelength of 800 nm. NLO absorption re…