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ALT Electron–electron interactions can reconstruct Bloch wave functions, changing their geometry and the associated thermoelectric response. We derive the linear thermoelectric response within the Hartree–Fock (HF) approximation using the thermal length-gauge density-matrix approach, resolving Drude, symmetric quantum-metric, and antisymmetric Berry-curvature contributions. In a noninteracting Bloch eigenbasis, we separate the reconstructed Berry connection into the noninteracting connection and an interaction connection. This gives bare, coherence, and interaction-connection contributions to the anomalous thermoelectric response. We determine the constraints imposed by spatial inversion, rotational, time-reversal, and combined symmetries on the three transport channels. In the relaxation-time approximation, the leading weak-broadening behavior is Γ⁻¹ for the Drude contribution, Γ for the quantum-metric contribution, and Γ⁰ for the Berry-curvature contribution. The interband scalings apply
ALT The Sr2RuO4-Ru eutectic system, in which metallic Ru inclusions are embedded in a Sr2RuO4 matrix, exhibits an enhanced superconducting onset temperature of about 3 K, known as the 3-K phase. Here we investigate the in-plane thermoelectric response of this eutectic system in the normal state and find a pronounced anisotropy in the thermopower for thermal gradients applied parallel and perpendicular to the Ru lamellae. To clarify its origin, we combine thermopower measurements with electronic-structure-based transport calculations and finite-element modeling of the local strain distribution generated by the thermal-expansion mismatch between Sr2RuO4 and Ru. The calculations show that uniaxial compression of Sr2RuO4 produces a sizable thermopower anisotropy through modification of the Fermi surfaces. When an idealized spatially inhomogeneous strain field around the Ru lamellae is included, the observed sign and qualitative magnitude of the anisotropy are reproduced more closely than in a
ALT Understanding and controlling heat flow in low-dimensional magnetic materials is central to thermoelectrics and spin caloritronics. One of the challenges is the absence of sensitive probes of small, field-dependent modulations in thermal transport. Here we demonstrate transverse Seebeck thermometry using exfoliated TaIrTe₄ as a probe of thermal conductivity modulated by an external magnetic field on a van der Waals magnet, CrPS₄. With a temperature gradient oriented at 45° to its principal crystallographic axes, TaIrTe₄ exhibits a transverse thermopower exceeding 200 μV K⁻¹ for 900 nm wide and 30 μm long electrodes, enabling precise detection of variations in the local temperature gradients. Exploiting this with CrPS₄ in a nonlocal geometry, we resolve distinct field dependent thermal conductivity changes associated with both the spin-flip and spin-flop magnetic transitions which we attribute to variations in the magnon-phonon coupling in CrPS₄. At 5 K, the transverse Seebeck response
ALT Half-Heusler alloys provide a versatile platform for tuning electronic and thermal transport through chemical substitution. Here, we investigate the thermoelectric and magnetotransport properties of spark-plasma-sintered YNi₀.₅Pt₀.₅Bi. Partial substitution of Ni by Pt drives YNiBi toward semimetallic transport, characterized by hole-dominated conduction, a low Hall carrier concentration of 1.9 × 10¹⁹ᶜᵐ⁻³, and a sizeable nonsaturating magnetoresistance of 18% at 300 K under 14 T. Compared with YNiBi, Pt alloying increases the room-temperature Seebeck coefficient from approximately 90 to 130 μV K⁻¹, while reducing the thermal conductivity to 3.15 W m⁻¹ᴷ⁻¹. Single-parabolic-band analysis indicates an enhanced carrier effective mass, resulting in a room-temperature power factor of 13.7 μW cm⁻¹ᴷ⁻² and a figure of merit (zT=0.13). First-principles calculations further show a Pt-induced closing of the electronic band gap and a low density of states near the Fermi level, consistent with the ex