Nature CommunicationsFlexural phonon instability defines intrinsic van der Waals elastic limits in the interlayer directionHeyi WangMiaojie LiuJiayi LiShizhe FengYuan HouMan Kit ChengKe CaoFanling MengJuzheng ChenZhiping XuYang Lu2026-06-10Full textDOI https://doi.org/10.1038/s41467-026-74353-w