Quantum phase transition between one-channel and two-channel Kondo polarons

For a mobile spin-1/2 impurity, coupled antiferromagnetically to a one-dimensional gas of fermions, perturbative ideas have been used to argue in favor of two-channel Kondo behavior of the impurity spin. Here we combine general considerations and extensive numerical simulations to show that the problem displays a novel quantum phase transition between two-channel and one-channel Kondo screening upon increasing the Kondo coupling. We construct a ground-state phase diagram and discuss the various non-trivial crossovers as well as possible experimental realizations.Comment: 5+4 pages, 5+3 fig

La responsabilidad del estado por hechos imputables al legislador en Colombia

En el presente trabajo se identificaron 13 sentencias del “Consejo de Estado” en las cuales esta corporación de cierre se ha pronunciado respecto a la “responsabilidad imputable al Estado por el hecho del legislador” con el estudio de estas se pudo concluir que si es procedente endilgar “responsabilidad al Estado” con ocasión a los hechos imputables al legislador por la creación de las leyes.Universidad Libre Seccional Pereira -- Facultad de Derecho, Ciencias Políticas y Sociales -- Especialización en Derecho Procesal, Probatorio y OralidadIn the present work, 13 sentences of the "State Council" were identified in which this closing corporation has pronounced itself regarding the "responsibility attributable to the State for the act of the legislator" with the study of these it was possible to conclude that if it is appropriate foist "responsibility on the State" on the occasion of the acts attributable to the legislature for the creation of laws