Réponse d'Adam Schaff

Schaff, Adam

doi:10.3406/homso.1971.1702

Cited by 2 publications

(2 citation statements)

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“…The objective is to engineer a trajectory ω z (t) between these two values so that if we start with an initial state at equilibrium at temperature T 0 , this state is mapped to a final equilibrium state at temperature [13]. Our solution is based on invariants of motion of the form [16,17]…”

Section: Optimal Trajectory Determinationmentioning

confidence: 99%

Fast optimal transition between two equilibrium states

Schaff¹,

Song²,

Vignolo³

et al. 2010

Phys. Rev. A

161

120

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We demonstrate a technique based on invariants of motion for a time-dependent Hamiltonian, allowing a fast transition to a final state identical in theory to that obtained through a perfectly adiabatic transformation. This method is experimentally applied to the fast decompression of an ultracold cloud of Rubidium 87 atoms held in a harmonic magnetic trap, in the presence of gravity. We are able to decompress the trap by a factor of 15 within 35 ms with a strong suppression of the sloshing and breathing modes induced by the large vertical displacement and curvature reduction of the trap. When compared to a standard linear decompression, we achieve a gain of a factor of 37 on the transition time.Comment: 5 pages, 4 figures, an error in Eq. (2) has been correcte

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Section: Optimal Trajectory Determinationmentioning

confidence: 99%

Fast optimal transition between two equilibrium states

Schaff¹,

Song²,

Vignolo³

et al. 2010

Phys. Rev. A

161

120

View full text Add to dashboard Cite

show abstract

“…In addition, it has been shown that the incorporation of Mg into InN shifts the Fermi level towards the valence band [16], that suggests p-type conductivity inside the sample. Recent measurements of the thermoelectric power show sometimes p-type conductivity realized by free holes [17][18][19]. It is not clear however why only certain InN:Mg samples exhibit this effect.…”

mentioning

confidence: 99%

Photoreflectance spectroscopy of the band bending and the energy gap for Mg‐doped InN layers

Kudrawiec¹,

Suski

Misiewicz

et al. 2009

Phys. Status Solidi (c)

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Photoreflectance (PR) spectroscopy has been applied to investigate the band bending (built‐in electric field) and the energy gap for Mg‐doped InN layers with various Mg concentrations (4.0‐7.3 × 1020 cm–3). A broad PR resonance followed by the Franz‐Keldysh oscillation, which is typical of the band‐to‐band absorption in the sample region with strong band bending, has been observed at the energy of ∼0.66‐0.7 eV. The region of strong band bending in InN:Mg layers results from the Fermi level pinning at the energy range i) above the conduction band at the sample surface and ii) close to the valence band inside InN:Mg layer due to Mg‐doping. The built‐in electric field in this region has been estimated from the Franz‐Keldysh oscillation to be ∼0.6‐0.8 MV/cm. In addition, it has been observed that the energy gap of InN:Mg is reduced from about 0.70 eV to 0.66 eV with the increase in Mg concentration from 4 to 7.3 × 1020 cm–3. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Réponse d'Adam Schaff

Cited by 2 publications

References 0 publications

Fast optimal transition between two equilibrium states

Fast optimal transition between two equilibrium states

Photoreflectance spectroscopy of the band bending and the energy gap for Mg‐doped InN layers

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