Nous considérons un électron non relativiste interagissant avec un champ magnétique classique dans la direction et un champ électromagnétique quantifié. Le système est invariant par translation suivant et l'Hamiltonien correspondant admet une décomposition . Pour une impulsion fixée suffisamment petite, nous montrons que possède un état fondamental dans la représentation Fock si et seulement si , où est la dérivée de l'application . Lorsque , nous obtenons l'existence d'un état fondamental dans une représentation non équivalente à la représentation Fock. Ce résultat est valable pour des valeurs suffisamment petites de la constante de couplage.
We consider a non-relativistic electron interacting with a classical magnetic field pointing along the -axis and with a quantized electromagnetic field. The system is translation invariant in the -direction and the corresponding Hamiltonian has a decomposition . For a fixed momentum sufficiently small, we prove that has a ground state in the Fock representation if and only if , where is the derivative of the map . If , we obtain the existence of a ground state in a non-Fock representation. This result holds for sufficiently small values of the coupling constant.
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@article{CRMATH_2008__346_19-20_1045_0, author = {Amour, Laurent and Faupin, J\'er\'emy and Gr\'ebert, Beno{\^\i}t and Guillot, Jean-Claude}, title = {Le probl\`eme infrarouge pour l'\'electron habill\'e non relativiste dans un champ magn\'etique}, journal = {Comptes Rendus. Math\'ematique}, pages = {1045--1050}, publisher = {Elsevier}, volume = {346}, number = {19-20}, year = {2008}, doi = {10.1016/j.crma.2008.09.015}, language = {fr}, url = {http://www.numdam.org/articles/10.1016/j.crma.2008.09.015/} }
TY - JOUR AU - Amour, Laurent AU - Faupin, Jérémy AU - Grébert, Benoît AU - Guillot, Jean-Claude TI - Le problème infrarouge pour l'électron habillé non relativiste dans un champ magnétique JO - Comptes Rendus. Mathématique PY - 2008 SP - 1045 EP - 1050 VL - 346 IS - 19-20 PB - Elsevier UR - http://www.numdam.org/articles/10.1016/j.crma.2008.09.015/ DO - 10.1016/j.crma.2008.09.015 LA - fr ID - CRMATH_2008__346_19-20_1045_0 ER -
%0 Journal Article %A Amour, Laurent %A Faupin, Jérémy %A Grébert, Benoît %A Guillot, Jean-Claude %T Le problème infrarouge pour l'électron habillé non relativiste dans un champ magnétique %J Comptes Rendus. Mathématique %D 2008 %P 1045-1050 %V 346 %N 19-20 %I Elsevier %U http://www.numdam.org/articles/10.1016/j.crma.2008.09.015/ %R 10.1016/j.crma.2008.09.015 %G fr %F CRMATH_2008__346_19-20_1045_0
Amour, Laurent; Faupin, Jérémy; Grébert, Benoît; Guillot, Jean-Claude. Le problème infrarouge pour l'électron habillé non relativiste dans un champ magnétique. Comptes Rendus. Mathématique, Tome 346 (2008) no. 19-20, pp. 1045-1050. doi : 10.1016/j.crma.2008.09.015. http://www.numdam.org/articles/10.1016/j.crma.2008.09.015/
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