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Bulk odd-frequency ...
Bulk odd-frequency pairing in the superconducting Su-Schrieffer-Heeger model
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- Tamura, Shun (författare)
- Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan.
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- Nakosai, Sho (författare)
- Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan.
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- Black-Schaffer, Annica M. (författare)
- Uppsala universitet,Materialteori
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- Tanaka, Yukio (författare)
- Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan.
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- Cayao, Jorge (författare)
- Uppsala universitet,Materialteori
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Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan Materialteori (creator_code:org_t)
- 2020
- 2020
- Engelska.
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Ingår i: Physical Review B. - 2469-9950 .- 2469-9969. ; 101:21
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- The Su-Schrieffer-Heeger model describes fermions that hop on a one-dimensional chain with staggered hopping amplitude, where the unit cell contains two sites, or two sublattices. In this work we consider the Su-Schrieffer-Heeger model with superconducting pairing and show that the sublattice index acts as an additional quantum number in the classification of Cooper pairs, giving rise to inter- and intrasublattice odd-frequency pair correlations in the bulk. Interestingly, this system behaves as a two-band superconductor where the bulk odd-frequency correlations depend solely on the intrinsic staggering properties of the model. In general, odd-frequency correlations coexist with even-frequency correlations in both the trivial and topological phases, with comparable and even larger odd-frequency amplitudes at the topological phase transition points at low frequencies, due to the closing of the energy gap at these points. Furthermore, we also discuss how bulk odd-frequency amplitudes are correlated with pseudogaps in the density of states and also with a charge density wave that appears due to the chemical potential imbalance between sublattices.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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