Krasnikova Yu V, Furuya S C, Glazkov V N, Povarov K Yu, Blosser D, Zheludev A
P. L. Kapitza Institute for Physical Problems, RAS, Kosygina 2, 119334 Moscow, Russia.
Laboratory for Condensed Matter Physics, National Research University Higher School of Economics, Myasnitskaya street 20, 101000 Moscow, Russia.
Phys Rev Lett. 2020 Jul 10;125(2):027204. doi: 10.1103/PhysRevLett.125.027204.
We report low temperature electron spin resonance experimental and theoretical studies of an archetype S=1/2 strong-rung spin ladder material (C_{5}H_{12}N){2}CuBr{4}. Unexpected dynamics is detected deep in the Tomonaga-Luttinger spin liquid regime. Close to the point where the system is half-magnetized (and believed to be equivalent to a gapless easy plane chain in zero field) we observed orientation-dependent spin gap and anomalous g-factor values. Field theoretical analysis demonstrates that the observed low-energy excitation modes in magnetized (C_{5}H_{12}N){2}CuBr{4} are solitonic excitations caused by Dzyaloshinskii-Moriya interaction presence.
我们报告了对原型S = 1/2强梯级自旋梯材料（C₅H₁₂N）₂CuBr₄的低温电子自旋共振实验和理论研究。在Tomonaga-Luttinger自旋液体区域深处检测到了意外的动力学现象。在系统接近半磁化的点（并且被认为等同于零场中的无隙易平面链）时，我们观察到了取向依赖的自旋能隙和异常的g因子值。场论分析表明，在磁化的（C₅H₁₂N）₂CuBr₄中观察到的低能激发模式是由Dzyaloshinskii-Moriya相互作用的存在引起的孤子激发。
