Abstract
The dielectric response, ɛ′ (ω) +iɛ″ (ω), of amorphous and glassy systems at low temperatures has been explained with considerable success by relaxation and resonant tunneling of independent tunneling two level systems (TLS) in response to an AC electric field. However, recent measurements have shown an AC response to the application of large DC electric fields which does not appear explicable in terms of independent TLS, but instead may result from the formation of a hole in the density of states of the TLS at zero effective local electric field, similar to that postulated to exist in spin glasses. This paper reports new studies of this response at very low temperatures which further support this interpretation, again suggesting that interactions are important in understanding the dynamics of such systems at low temperatures.
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