Q=0 collective modes originating from the low-lying Hg-O band in superconducting HgBa2CuO4+δ
Tanmoy Das
DOI 10.1103/PhysRevB.86.054518 · Physical Review B
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Abstract
Motivated by the recent discovery of two Q∼0 collective modes [Y. Li et al., Nature (London) 468, 283 (2010); Y. Li et al., Nat. Phys. 8, 404 (2012)] in single-layer HgBa2CuO4+δ, which are often taken as evidence of the orbital-current origin of a pseudogap, I examine an alternative and assumption-free scenario constrained by first-principles calculations. I find that in addition to the common CuO2 band, a hybridized Hg-O state is present in the vicinity of the Fermi level and that it contributes to the low-energy ground state of this system. I calculate the spin-excitation spectrum based on the random-phase approximation in the superconducting state using a two-band model and show that a collective mode in the multiorbital channel arises at Q=0. This mode splits in energy yet remains at Q∼0 as a pseudogap develops breaking both translational and time-reversal symmetries. The observations of the dynamical mode and static moment in the pseudogap state are in good accord with experimental observations. Detection of Hg-O band via optical study, or magnetic moment in the Hg-O layer will be tests of this calculation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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