Journal
PHYSICAL REVIEW X
Volume 7, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.7.031058
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Funding
- Ministry of Science and Technology of China [2016YFA0300502]
- National Science Foundation of China [11421092, 11574359]
- National Thousand-Young-Talents Program of China
- National Science Foundation at the University of Michigan [PHY-1402971]
- Alfred P. Sloan Foundation
- Israel Science Foundation [1291/12]
- US-Israel BSF [2014209]
- Marie Curie reintegration grant
- Alon grant
- Direct For Mathematical & Physical Scien
- Division Of Physics [1402971] Funding Source: National Science Foundation
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We construct a two-dimensional lattice model of fermions coupled to Ising ferromagnetic critical fluctuations. Using extensive sign-problem-free quantum Monte Carlo simulations, we show that the model realizes a continuous itinerant quantum phase transition. In comparison with other similar itinerant quantum critical points (QCPs), our QCP shows a much weaker superconductivity tendency with no superconducting state down to the lowest temperature investigated, hence making the system a good platform for the exploration of quantum critical fluctuations. Remarkably, clear signatures of non-Fermi liquid behavior in the fermion propagators are observed at the QCP. The critical fluctuations at the QCP partially resemble Hertz-Millis-Moriya behavior. However, careful scaling analysis reveals that the QCP belongs to a different universality class, deviating from both (2 + 1)D Ising and Hertz-Millis-Moriya predictions.
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