TY  - JOUR
A1  - Schechter, Moshe
A1  - Nalbach, Peter
A1  - Burin, A. L.
T1  - Nonuniversality and strongly interacting two-level systems in glasses at low temperatures
T2  - New journal of physics. The open-access journal for physics
N2  - Recent experimental results showing atypical nonlinear absorption and marked deviations from well known universality in the low temperature acoustic and dielectric losses in amorphous solids prove the need for improving the understanding of the nature of two-level systems (TLSs) in these materials. Here we suggest the study of TLSs focused on their properties which are nonuniversal. Our theoretical analysis shows that the standard tunneling model and the recently suggested two-TLS model provide markedly different predictions for the experimental outcome of these studies. Our results may be directly tested in disordered lattices, e.g KBr:CN, where there is ample theoretical support for the validity of the two-TLS model, as well as in amorphous solids. Verification of our results in the latter will significantly enhance understanding of the nature of TLSs in amorphous solids, and the ability to manipulate them and reduce their destructive effect in various cutting edge applications including superconducting qubits.
Y1  - 2018
UR  - https://whge.opus.hbz-nrw.de/frontdoor/index/index/docId/3128
SN  - 1367-2630
VL  - 20
IS  - June
SP  - 063048
ER  -