Dielectric anomalies and interactions in the three-dimensional quadratic band touching Luttinger semimetal Pr2Ir2O7
Open accessAbstract
Dirac and Weyl semimetals with linearly crossing bands are the focus of much recent interest in condensed matter physics. Although they host fascinating phenomena, their physics can be understood in terms of weakly interacting electrons. In contrast, more than 40 years ago, Abrikosov pointed out that quadratic band touchings are generically strongly interacting. We have performed terahertz spectroscopy on the films of the conducting pyrochlore Pr 2 Ir 2 O 7, which has been shown to host a quadratic band touching. A dielectric constant as large as $$\tilde{ \varepsilon} {\mathrm{/}}\epsilon _0 \sim 180$$ ε ̃ ∕ ϵ 0 ~ 180 is observed at low temperatures. In such systems, the dielectric constant is a measure of the relative scale of interactions, which are therefore in our material almost two orders of magnitude larger than the kinetic energy. Despite this, the scattering rate exhibits a T2 dependence, which shows that for finite doping a Fermi liquid state survives—however, with a scattering rate close to the maximal value allowed.
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The dielectric constant in Pr2Ir2O7 becomes of order 200 at low temperatures.
“Recent optics work on Pr 2 Ir 2 O 7 shows that the dielectric constant in this material becomes of order 200 at low temperatures demonstrating that this material is in the strongly interacting regime (Cheng et al. , 2017).”
From Weyl and Dirac semimetals in three-dimensional solids (2018) · cites this paper as Cheng et al., 2017
Pr2Ir2O7 is in the strongly interacting regime.
“Recent optics work on Pr 2 Ir 2 O 7 shows that the dielectric constant in this material becomes of order 200 at low temperatures demonstrating that this material is in the strongly interacting regime (Cheng et al. , 2017).”
From Weyl and Dirac semimetals in three-dimensional solids (2018) · cites this paper as Cheng et al., 2017
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Armitage, N. P., Mele, E. J., & Vishwanath, A. (2017) · arXiv
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Cited by
Sorted by citations
Weyl and Dirac semimetals in three-dimensional solids
Armitage, N. P., Mele, E. J., & Vishwanath, A. (2018) · Reviews of Modern Physics · doi:10.1103/revmodphys.90.015001 · Cited by 4,528 · see citing works
“Recent optics work on Pr2Ir2O7 shows that the dielectric constant in this material becomes of order 200 at low temperatures demonstrating that this material is in the strongly interacting regime (Cheng et al., 2017).”
BackgroundSelf-citationWeyl and Dirac Semimetals in Three Dimensional Solids
Armitage, N. P., Mele, E. J., & Vishwanath, A. (2017) · arXiv
“Recent optics work on Pr2Ir2O7 shows that the dielectric constant in this material becomes of order 200 at low temperatures demonstrating that this material is in the strongly interacting regime (Cheng et al., 2017).”
BackgroundSelf-citation
- Authors
- Cheng, B., Ohtsuki, T., Chaudhuri, D., Nakatsuji, S., Lippmaa, M., & Armitage, N. P.
- Affiliations
- Johns Hopkins University (US)
- The Institute for Solid State Physics, The University of Tokyo (JP)
- Japan Science and Technology Agency (JP)
- Corresponding author
- Armitage, N. P.
- Venue
- Nature Communications
- Published
- 2017-12-13
- Volume
- 8
- Issue
- 1
- Pages
- 2097-2097
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC5727407
- OpenAlex
- W2773884445
- Cited by
- 60
- References
- 4
- Citations by year
- 2025: 9 · 2024: 10 · 2023: 3 · 2022: 4 · 2021: 6 · 2020: 10 · 2019: 14 · 2018: 4
- FWCI
- 3.76
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Nature Communications (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- arXiv (Cornell University)
- APS March Meeting Abstracts
- Bulletin of the American Physical Society
- Funders
- Gordon and Betty Moore Foundation (GBMF5305)
- Japan Society for the Promotion of Science (26105001, 15H05882 and 15H05883, 15H05883, 15K21719, 26105002, R2604, CREST, 15H05882, 16H02209)
- Japan Science and Technology Agency (CREST, R2604, 15H05883, 16H02209, 15H05882, 26105002)
- Core Research for Evolutional Science and Technology (16H02209, 15H05882, 15H05883)
- Army Research Office (W911NF-15-1-, W911NF, W911NF-15, W911NF-15-1-0560)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Keywords
- quadratic band touching, Pr2Ir2O7, pyrochlore, dielectric constant, dielectric anomaly, electron-electron interaction, terahertz spectroscopy, Fermi liquid, scattering rate, strongly correlated electrons
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