Berlin 2005 – wissenschaftliches Programm
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K: Kurzzeitphysik
K 5: Neue Verfahren / Hochdruckphysik
K 5.2: Vortrag
Mittwoch, 9. März 2005, 11:20–11:40, HU 3092
Short lived protonic quantum entanglement and coupling to the electronic environment — •Tyno Abdul-Redah1, Aris C. Chatzidimitriou-Dreismann2, and Matthias Krzystyniak2 — 1ISIS Facility, Rutherford Appleton Lab., OX11 0QX, Chilton/Didcot, UK. — 2Stranski Lab., Inst. f. Chemie, TU Berlin, Str. d. 17. Juni 112, D-10623 Berlin, Germany.
A temperature dependent decrease of the protonic total neutron scattering cross section σH in LiH using neutron Compton scattering (NCS) has been reported [1]. The decrease of σH which is found in various materials is attributed to short-lived protonic quantum entanglement [2] and the novel temperature dependence to the different decoherence due to coupling of the protons to the environment [1]. To shed more light on the latter, the NCS of two metal hydrides, i.e., LaH2 and LaH3, have been measured. While LaH2 is metallic, LaH3 is an isolator, thus involving different electronic environments the protons are coupled to. σH is found to be smaller for LaH3 than for LaH2. This result strongly indicate that the different couplings of the protons to the different electronic environments of LaH2 and LaH3 is responsible for these differences. Further experimental results on other materials with different electronic structures will be also presented.
[1] T. Abdul-Redah, C. A. Chatzidimitriou-Dreismann, Physica B 350 S1 (2004) E983-E986.
[2] C. A. C.-Dreismann, M. Vos, C. Kleiner, T. Abdul Redah, Phys. Rev. Lett. 91 (2003) 057403.