ORCID Profile
0000-0002-8634-3834
Current Organisation
Nanyang Technological University
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Publisher: Springer Science and Business Media LLC
Date: 27-07-2018
DOI: 10.1038/S41467-018-04903-4
Abstract: Creating oxide interfaces with precise chemical specificity at the atomic layer level is desired for the engineering of quantum phases and electronic applications, but highly challenging, owing partially to the lack of in situ tools to monitor the chemical composition and completeness of the surface layer during growth. Here we report the in situ observation of atomic layer-by-layer inner potential variations by analysing the Kikuchi lines during epitaxial growth of strontium titanate, providing a powerful real-time technique to monitor and control the chemical composition during growth. A model combining the effects of mean inner potential and step edge density (roughness) reveals the underlying mechanism of the complex and previously not well-understood reflection high-energy electron diffraction oscillations observed in the shuttered growth of oxide films. General rules are proposed to guide the synthesis of atomically and chemically sharp oxide interfaces, opening up vast opportunities for the exploration of intriguing quantum phenomena at oxide interfaces.
Publisher: Wiley
Date: 07-06-2018
Publisher: American Chemical Society (ACS)
Date: 30-10-2019
Publisher: American Physical Society (APS)
Date: 29-11-2021
Publisher: American Chemical Society (ACS)
Date: 20-12-2017
Abstract: Morphology management for tailoring the properties of monolayer transition-metal dichalcogenides (TMDCs), that is, molybdenum disulfide (MoS
Publisher: American Physical Society (APS)
Date: 22-07-2020
Publisher: Wiley
Date: 20-03-2019
Publisher: Elsevier BV
Date: 04-2021
Publisher: Springer Science and Business Media LLC
Date: 09-07-2021
DOI: 10.1038/S41467-021-24527-5
Abstract: A systematic study of various metal-insulator transition (MIT) associated phases of VO 2 , including metallic R phase and insulating phases (T, M1, M2), is required to uncover the physics of MIT and trigger their promising applications. Here, through an oxide inhibitor-assisted stoichiometry engineering, we show that all the insulating phases can be selectively stabilized in single-crystalline VO 2 beams at room temperature. The stoichiometry engineering strategy also provides precise spatial control of the phase configurations in as-grown VO 2 beams at the submicron-scale, introducing a fresh concept of phase transition route devices. For instance, the combination of different phase transition routes at the two sides of VO 2 beams gives birth to a family of single-crystalline VO 2 actuators with highly improved performance and functional ersity. This work provides a substantial understanding of the stoichiometry-temperature phase diagram and a stoichiometry engineering strategy for the effective phase management of VO 2 .
Publisher: American Chemical Society (ACS)
Date: 02-02-2021
Publisher: American Chemical Society (ACS)
Date: 20-09-2019
Publisher: American Chemical Society (ACS)
Date: 03-06-2020
Publisher: Wiley
Date: 04-01-2018
Publisher: IOP Publishing
Date: 07-2021
Abstract: Ba 2 IrO 4 is a sister compound of the widely investigated Sr 2 IrO 4 and has no IrO 6 octahedral rotation nor net canted antiferromagnetic moment, thus it acts as a system more similar to the high- T c cuprate. In this work, we synthesize the Ba 2 IrO 4 epitaxial films by reactive molecular beam epitaxy and study their crystalline structure and transport properties under biaxial compressive strain. High resolution scanning transmission electron microscopy and x-ray diffraction confirm the high quality of films with partial strain relaxation. Under compressive epitaxial strain, the Ba 2 IrO 4 exhibits the strain-driven enhancement of the conductivity, consistent with the band gap narrowing and the stronger hybridization of Ir-t 2g and O-2p orbitals predicted in the first-principles calculations.
Publisher: Oxford University Press (OUP)
Date: 30-07-2020
Publisher: American Chemical Society (ACS)
Date: 25-02-2020
Publisher: American Chemical Society (ACS)
Date: 03-07-2019
No related grants have been discovered for Xiangbin Cai.