A
Alexandra Carvalho
Researcher at National University of Singapore
Publications - 124
Citations - 15656
Alexandra Carvalho is an academic researcher from National University of Singapore. The author has contributed to research in topics: Phosphorene & Band gap. The author has an hindex of 42, co-authored 120 publications receiving 12411 citations. Previous affiliations of Alexandra Carvalho include University of Aveiro & École Polytechnique Fédérale de Lausanne.
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2D materials and van der Waals heterostructures
TL;DR: Two-dimensional heterostructures with extended range of functionalities yields a range of possible applications, and spectrum reconstruction in graphene interacting with hBN allowed several groups to study the Hofstadter butterfly effect and topological currents in such a system.
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Strain-induced gap modification in black phosphorus.
TL;DR: From numerical calculations and arguments based on the crystal structure of the material, it is shown that the deformation in the direction normal to the plane can be used to change the gap size and induce a semiconductor-metal transition.
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Phosphorene: from theory to applications
TL;DR: In this article, a review of the physical properties of phosphorene and its application in 2D semiconductor materials is presented. But, unlike graphene, phosphorenes have an anisotropic orthorhombic structure that is ductile along one of the inplane crystal directions but stiff along the other.
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Tunable optical properties of multilayer black phosphorus thin films
Tony Low,Tony Low,Tony Low,Aleksandr Rodin,Alexandra Carvalho,Yongjin Jiang,Han Wang,Fengnian Xia,A. H. Castro Neto,A. H. Castro Neto +9 more
TL;DR: In this article, the optical conductivity tensor of multilayer black phosphorus thin films using the Kubo formula within an effective low-energy Hamiltonian was calculated, and the role of interband coupling and disorder on observed anisotropic absorption spectra was discussed.
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Oxygen Defects in Phosphorene
Angelo Ziletti,Alexandra Carvalho,David K. Campbell,David F. Coker,David F. Coker,A. H. Castro Neto,A. H. Castro Neto +6 more
TL;DR: This work shows that for each oxygen atom adsorbed onto phosphorene there is an energy release of about 2 eV, and proposes a mechanism forosphorene oxidation involving reactive dangling oxygen atoms and suggests that hanging oxygen atoms increase the hydrophilicity of phosphorenes.