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The $J_1$-$J_2$ quantum spin sawtooth chain is a paradigmatic one-dimensionalfrustrated quantum spin system exhibiting unconventional ground-state andfinite-temperature properties. In particular, it exhibits a flat energy band ofone-magnon excitations accompanied by an enhanced magnetocaloric effect for twosingular ratios of the basal interactions $J_1$ and the zigzag interactions$J_2$. In our paper, we demonstrate that one can drive the spin system into aflat-band scenario by applying an appropriate electric field, thus overcomingthe restriction of fine-tuned exchange couplings $J_1$ and $J_2$ and allowingone to tune more materials towards flat-band physics, that is to show amacroscopic magnetization jump when crossing the magnetic saturation field, aresidual entropy at zero temperature as well as an enhanced magnetocaloriceffect. While the magnetic field acts on the spin system via the ordinaryZeeman term, the coupling of an applied electric field with the spins is givenby the sophisticated Katsura-Nagaosa-Balatsky (KNB) mechanism, where theelectric field effectively acts as a Dzyaloshinskii-Moriya spin-spininteraction. The resulting novel features are corresponding reciprocal effects:We find a magnetization jump driven by the electric field as well as a jump ofthe electric polarization driven by the magnetic field, i.e.\ the systemexhibits an extraordinarily strong magnetoelectric effect. Moreover, in analogyto the enhanced magnetocaloric effect the system shows an enhancedelectrocaloric effect.

Electric field driven flat bands: Enhanced magnetoelectric and electrocaloric effects in frustrated quantum magnets