講演情報
[9a-E207-5]Electric-current control of quantum-geometric nonlinear Hall state in a chiral antiferromagnet
Tomohiro Uchimura1,2, 〇Jiahao Han1,3,4, Yasufumi Araki5, Yuta Yamane1,6, Shun Kanai1,2,3,4,7,8,9, Junichi Ieda5, Hideo Ohno1,3,4,10, Shunsuke Fukami1,2,3,4,10,11 (1.RIEC, Tohoku Univ., 2.Grad School of Eng., Tohoku Univ., 3.CSIS, Tohoku Univ., 4.AIMR, Tohoku Univ., 5.ASRC, JAEA., 6.FRIS, Tohoku Univ., 7.PRESTO, JST., 8.DEFS, Tohoku Univ., 9.QST., 10.CIES, Tohoku Univ., 11.InaRIS.)
キーワード：
Quantum-geometric nonlinear Hall effect、Chiral antiferromagnet、Electric-current control
Quantum-geometric nonlinear Hall (QgNLH) states characterize an important family of quantum systems that integrate quantum-geometric origins, distinct symmetry dependences, and nonlinear transverse voltage-current responses. To functionalize the QgNLH states, on-demand electrical manipulation is essential but remains challenging. Here, we propose and demonstrate a conception of controlling QgNLH states by electric current. In an epitaxial thin film of chiral antiferromagnet Mn3Sn, we first observe a nonlinear Hall effect that flips sign by reversing the chiral-spin structure in a non-volatile manner and verify its quantum-geometric origin. On this basis, we achieve electric-current control of such QgNLH state via the spin-orbit torque from adjacent heavy metals to Mn3Sn, which enables an efficient, durable, and scalable control scheme of QgNLH states. This work opens opportunities for harnessing quantum-geometric nonlinear phenomena in practical devices that allow for electric-current operation at room temperature.