Giuseppe Colizzi - Academia.edu (original) (raw)
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Papers by Giuseppe Colizzi
Applied Physics Letters, 2010
Cu2O/La0.7Sr0.3MnO3 is a promising heterostructure for the realization of all-oxide spintronics d... more Cu2O/La0.7Sr0.3MnO3 is a promising heterostructure for the realization of all-oxide spintronics devices, with La0.7Sr0.3MnO3 (LSMO) and Cu2O playing the roles of ferromagnet and semiconductor, respectively. Here we use x-ray photoelectron spectroscopy and first principles calculations to determine the valence band offset at the Cu2O/LSMO interface. The interface band alignment is typical of a p-type semiconductor/metal contact, with an interface barrier
![Research paper thumbnail of Band alignment at Cu[sub 2]O/La[sub 0.7]Sr[sub 0.3]MnO[sub 3] interface: A combined experimental-theoretical determination](https://attachments.academia-assets.com/46755083/thumbnails/1.jpg)
](Applied Physics Letters, 2010
Applied Physics Letters, Jul 1, 2010
Abstract Cu 2 O/La 0.7 Sr 0.3 MnO 3 is a promising heterostructure for the realization of all-oxi... more Abstract Cu 2 O/La 0.7 Sr 0.3 MnO 3 is a promising heterostructure for the realization of all-oxide spintronics devices, with La 0.7 Sr 0.3 MnO 3 (LSMO) and Cu 2 O playing the roles of ferromagnet and semiconductor, respectively. Here we use x-ray photoelectron spectroscopy and first principles calculations to determine the valence band offset at the Cu 2 O/LSMO interface. The interface band alignment is typical of a p-type semiconductor/metal contact, with an interface barrier of 0.3–0.5 eV depending on Cu 2 O thickness. The ...
The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles lin... more The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles linear response calculations. The paraelectric phase shows two instabilities. One for a z-polarized mode, which leads to the spontaneous polarization Ps of the ferroelectric phase. The other corresponds to a two-fold degenerate xy-polarized mode. Other phonons are analyzed, which couple to the ferroelectric one at large amplitudes and are relevant for the ferroelectric transition. We show that Ps is mainly of electronic nature, since it arises mostly from an off-diagonal component of the Born effective charge tensor of H, with minor contribution from P atoms displacements.
Ferroelectrics, 2004
Results of first-principles calculations are reported for KDP and DKDP as a function of pressure.... more Results of first-principles calculations are reported for KDP and DKDP as a function of pressure. The global energy barrier between the two stable (oppositely polarized) equilibrium configurations, and the separation between the corresponding positions of the H-atoms in the O─H─O bridges, are analyzed in terms of a previously proposed, self-consistent double-well model. We argue that the experimentally observed similarity of
The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles lin... more The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles linear response calculations. The paraelectric phase shows two instabilities. One for a z-polarized mode, which leads to the spontaneous polarization Ps of the ferroelectric phase. The other corresponds to a two-fold degenerate xy-polarized mode. Other phonons are analyzed, which couple to the ferroelectric one at large
Ferroelectrics, 2010
The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles lin... more The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles linear response calculations. The paraelectric phase shows two instabilities. One for a z-polarized mode, which leads to the spontaneous polarization Ps of the ferroelectric phase. The other corresponds to a two-fold degenerate xy-polarized mode. Other phonons are analyzed, which couple to the ferroelectric one at large
Applied Physics Letters, 2010
Cu2O/La0.7Sr0.3MnO3 is a promising heterostructure for the realization of all-oxide spintronics d... more Cu2O/La0.7Sr0.3MnO3 is a promising heterostructure for the realization of all-oxide spintronics devices, with La0.7Sr0.3MnO3 (LSMO) and Cu2O playing the roles of ferromagnet and semiconductor, respectively. Here we use x-ray photoelectron spectroscopy and first principles calculations to determine the valence band offset at the Cu2O/LSMO interface. The interface band alignment is typical of a p-type semiconductor/metal contact, with an interface barrier
Applied Physics Letters, 2010
Applied Physics Letters, Jul 1, 2010
Abstract Cu 2 O/La 0.7 Sr 0.3 MnO 3 is a promising heterostructure for the realization of all-oxi... more Abstract Cu 2 O/La 0.7 Sr 0.3 MnO 3 is a promising heterostructure for the realization of all-oxide spintronics devices, with La 0.7 Sr 0.3 MnO 3 (LSMO) and Cu 2 O playing the roles of ferromagnet and semiconductor, respectively. Here we use x-ray photoelectron spectroscopy and first principles calculations to determine the valence band offset at the Cu 2 O/LSMO interface. The interface band alignment is typical of a p-type semiconductor/metal contact, with an interface barrier of 0.3–0.5 eV depending on Cu 2 O thickness. The ...
The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles lin... more The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles linear response calculations. The paraelectric phase shows two instabilities. One for a z-polarized mode, which leads to the spontaneous polarization Ps of the ferroelectric phase. The other corresponds to a two-fold degenerate xy-polarized mode. Other phonons are analyzed, which couple to the ferroelectric one at large amplitudes and are relevant for the ferroelectric transition. We show that Ps is mainly of electronic nature, since it arises mostly from an off-diagonal component of the Born effective charge tensor of H, with minor contribution from P atoms displacements.
Ferroelectrics, 2004
Results of first-principles calculations are reported for KDP and DKDP as a function of pressure.... more Results of first-principles calculations are reported for KDP and DKDP as a function of pressure. The global energy barrier between the two stable (oppositely polarized) equilibrium configurations, and the separation between the corresponding positions of the H-atoms in the O─H─O bridges, are analyzed in terms of a previously proposed, self-consistent double-well model. We argue that the experimentally observed similarity of
The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles lin... more The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles linear response calculations. The paraelectric phase shows two instabilities. One for a z-polarized mode, which leads to the spontaneous polarization Ps of the ferroelectric phase. The other corresponds to a two-fold degenerate xy-polarized mode. Other phonons are analyzed, which couple to the ferroelectric one at large
Ferroelectrics, 2010
The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles lin... more The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles linear response calculations. The paraelectric phase shows two instabilities. One for a z-polarized mode, which leads to the spontaneous polarization Ps of the ferroelectric phase. The other corresponds to a two-fold degenerate xy-polarized mode. Other phonons are analyzed, which couple to the ferroelectric one at large