6 research outputs found
Exploration of growth conditions of TaAs Weyl semimetal thin film by pulsed laser deposition
TaAs, the first experimentally discovered Weyl semimetal material, has
attracted a lot of attention due to its high carrier mobility, high anisotropy,
nonmagnetic and strong interaction with light. These make it an ideal candidate
for the study of Weyl fermions and the applications in quantum computation,
thermoelectric devices, and photodetection. For further basic physics studies
and potential applications, large-size and high-quality TaAs films are urgently
needed. However, it is difficult to grow As-stoichiometry TaAs films due to the
volatilization of As during the growth. To solve this problem, the TaAs films
were attempted to grow on different substrates using targets with different As
stoichiometric ratios by pulsed laser deposition (PLD). In this work, we have
found that partial As ions of the GaAs substrate are likely to diffuse into the
TaAs films during growth, which was preliminarily confirmed by the structural
characterization, surface topography and composition analysis. As a result, the
As content in the TaAs film is improved and the TaAs phase is achieved. Our
work presents an effective method to fabricate the TaAs films by PLD, providing
the possible use of the Weyl semimetal film for functional devices
Shoot organogenesis and somatic embryogenesis from leaf and root explants of Scaevola sericea
Abstract An efficient regeneration system via shoot organogenesis and somatic embryogenesis from in vitro leaf and root explants was established for Scaevola sericea for the first time. The highest axillary shoot proliferation coefficient (4.8) was obtained on Murashige and Skoog (MS) medium supplemented with 1.0 mg/L 6-benzyladenine (BA) and 0.1 mg/L α-naphthaleneacetic acid (NAA) every 45 days. Young in vitro leaves and roots, which were used as explants, were cultured onto medium supplemented with different plant growth regulators. Our results showed that only cytokinins BA and thidiazuron (TDZ), could induce adventitious shoots and somatic embryos from leaf and root explants. The optimal medium to achieve this was MS medium supplemented with 2.5 mg/L BA and which induced most adventitious shoots (2.7) and somatic embryos (17.3) from leaf explants within 30 days. From root explants, 1.1 adventitious shoots and 7.6 somatic embryos could be induced on MS medium supplemented with 2.5 mg/L TDZ. Histological observation showed that both somatic embryos and adventitious shoots were originated from homogeneous parenchyma and the development of somatic embryos was visible. Maximum rooting percentage (99.0%) was achieved on half-strength MS medium supplemented with 2.5 mg/L NAA. Well-rooted plantlets, which were transplanted into a substrate of pure river sand, displayed a high survival percentage of 91.7% after transplanting for 45 days while the best substrate for plantlet growth was river sand: coral sand (1:1)