Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W16: Competing Orders in the Kagome Lattice Superconductors
3:00 PM–5:36 PM,
Thursday, March 7, 2024
Room: M100G
Sponsoring
Unit:
DCMP
Chair: Bo Yang, Nanyang Technological University
Abstract: W16.00006 : Mechanism of Loop Current Order in Kagome metals AV3Sb5
4:00 PM–4:12 PM
Presenter:
Rina Tazai
(YITP, Kyoto University)
Authors:
Rina Tazai
(YITP, Kyoto University)
Youichi Yamakawa
(Nagoya Univ)
Seiichiro Onari
(Nagoya University)
Hiroshi Kontani
(Nagoya Univ)
TRSB was reported by μSR, Kerr rotation, field-tuned chiral transport and STM study. More recently, magnetic torque measurement reveals the nematic order with TRSB at 130 [K].
However, the microscopic origin of TRSB and C2-nematicity have been unsolved. To solve this problem, we consider the important roles of bond-order (BO) fluctuations, which is developed near the quantum-critical point of BO phase. Considering the exchange processes of BO fluctuation, we reveal that the chiral current phase is the most stable phase. This exchange process cause the sizable off-site Umklapp scattering. The order parameter of loop current is expressed by the imaginary hopping in Hermite Hamiltonian. Thus, the chiral current order brings TRSB. Furthermore, we discover that the coexistence of the BO and current order cause the novel C2-nematicity along the three lattice directions (3Q) on kagome lattice. To show this fact, we calculate the Ginzburg-Landau coefficients and find the emergence of C2-nematic state. The present theory reveals the close relationship between the TRSB, BO, C2-nematicity.
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