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Acoustic properties of metallic glasses at low temperatures: Tunneling systems and their dephasing

Meißner, Arnold 1; Voigtländer, Tim 1; Meißner, Saskia M. 1; Kühn, Uta; Schneider, Susanne; Shnirman, Alexander 2,3; Weiss, Georg 1
1 Karlsruher Institut für Technologie (KIT)
2 Institut für Theorie der Kondensierten Materie (TKM), Karlsruher Institut für Technologie (KIT)
3 Institut für Quantenmaterialien und -technologien (IQMT), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The low temperature acoustic properties of bulk metallic glasses measured over a broad range of frequencies rigorously test the predictions of the standard tunneling model. The strength of these experiments and their analyses is mainly based on the interaction of the tunneling states with conduction electrons or quasiparticles in the superconducting state. A series of experiments at kHz and GHz frequencies on the same sample material essentially confirms previous measurements and their discrepancies with theoretical predictions. These discrepancies can be lifted by considering more correctly the linewidths of the dominating two-level atomic-tunneling systems. In fact, dephasing caused or mediated by interaction with conduction electrons may lead to particularly large linewidths and destroy the tunneling sytems' two-level character in the normal conducting state.


Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Institut für Theorie der Kondensierten Materie (TKM)
Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2469-9950, 2469-9969
KITopen-ID: 1000135108
HGF-Programm 47.12.04 (POF IV, LK 01) Quantum Networking
Weitere HGF-Programme 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Physical Review B
Verlag American Physical Society (APS)
Band 103
Heft 22
Seiten 224209
Vorab online veröffentlicht am 25.06.2021
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