Identification of strong and weak interacting two level systems in KBr:CN

Details Identification of strong and weak interacting two level systems in KBr:CN Identification of strong and weak interacting two level systems in KBr:CN

2010-12-09

arxiv.org/abs/1012.1852v2

Phys. Rev. Lett. 107, 105504 (2011)

Physics

Condensed Matter

Disordered Systems and Neural Networks

minor modifications, published version

Scientific paper

10.1103/PhysRevLett.107.105504

Tunneling two level systems (TLSs) are believed to be the source of phenomena such as the universal low temperature properties in disordered and amorphous solids, and $1/f$ noise. The existence of these phenomena in a large variety of dissimilar physical systems testifies for the universal nature of the TLSs, which however, is not yet known. Following a recent suggestion that attributes the low temperature TLSs to inversion pairs [M. Schechter and P.C.E. Stamp, arXiv:0910.1283.] we calculate explicitly the TLS-phonon coupling of inversion symmetric and asymmetric TLSs in a given disordered crystal. Our work (a) estimates parameters that support the theory in M. Schechter and P.C.E. Stamp, arXiv:0910.1283, in its general form, and (b) positively identifies, for the first time, the relevant TLSs in a given system.

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