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24 April 2024 |
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Paradigm shift for quantum paraelectric: softening of longitudinal modes | | Yaron Kedem
; | | Date: |
31 Mar 2020 | | Abstract: | We revisit the quantum phase transition from a paraelectric state to a
ferroelectric one and in particular the widespread distinction between a
longitudinal modes to transverse one. In contrast to transitions at finite
temperature, for a quantum phase transition breaking a discrete symmetry the
splitting between the modes is irrelevant. We show that an anisotropy in the
context of a quantum phase transition leads to a different behavior, compared
to a classical transition, and suggest an experiment to observe it. The result
is essential for explaining the pairing mechanism in strontium titanate. | | Source: | arXiv, 2004.0029 | | Services: | Forum | Review | PDF | Favorites | |
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