Electrical switching of ferro-rotational order in nanometre-thick 1T-TaS2 crystals

Control of Charge‐Spin Interconversion in van der Waals Heterostructures with Chiral Charge Density Waves

“…In combination with the control of the commensurability [ 34,35 ] and the helicity [ 36 ] of the CDW phase in 1T‐TaS 2 achieved via electrical stimulation, our observation provides new opportunities for designing functional electric‐field‐control‐of spintronic devices with a degree of freedom from the TMDC material itself. For instance, the tunable CSI could be exploited in spin‐orbit torque memory devices, where only specific unconventional CSI components contribute to the deterministic switching of perpendicular magnetization.…”

“…However, this scale is much smaller than our micrometer‐level devices. Although nanometer‐ and millimeter‐size chiral domains have been reported in recent studies, [ 36,48,49 ] the size could also be restricted by the appearance of impurities. [ 40 ] Therefore, we deduce that the contributions from UREE and interfacial $$\sigma _{xy}^y$$ are canceled out due to the mixed chiral domains with opposite handedness, that is, the vanishing $$R_{{\mathrm{CSI}}}^{{S}_y}$$ in our experiments, whereas the conventional REE and interfacial $$\sigma _{xy}^x$$ contribute to the observed $$R_{{\mathrm{CSI}}}^{{S}_x}$$.…”

“…Beyond its wide exploration for the fundamental connections with some correlated states of matter, such as unconventional superconductivity, [ 33 ] its relationship with functional phenomena might be a promising direction. Here, we explore 1T‐TaS 2 , a TMDC featuring helical CDW phases with various degrees of commensurability, [ 34–36 ] as an ideal platform for controlling CSI. By spin precession experiments, we confirm the CSI with the spins polarized in the three directions predicted in the twisted Gr/1T‐TaS 2 heterostructures.…”

Controllable Synthesis and Charge Density Wave Phase Transitions of Two-Dimensional 1T-TaS2 Crystals

“…Hence, it is challenging to fabricate four contacts on a thin sample with a size smaller than 10 µm. To better compare the test results from samples with different thicknesses, two-contact devices were fabricated for all samples, which were proven to be valid for the resistance measurements on exfoliated samples [16]. During the electrical measurements, the positive and negative electrodes were fixed at different temperatures to prevent inconsistent modifications to hysteresis loops from Schottky effects.…”

“…It has extensive prospects for applications as electronic, magnetic, and energy conversion devices, such as high-performance oscillators [6], fast memories [7], solar cells [8], humidity sensors [9,[11][12][13], and high-efficiency electrocatalysts [10,14,15]. Recently, the ferroic character of 2D 1T-TaS 2 was established by revealing the hysteretic electrical switching of the ferro-rotational order through the observation of its domains and domain wall propagation [16].…”