Nazaryan Khachatur G, Fu Liang
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Sci Adv. 2024 Nov 29;10(48):eadp5681. doi: 10.1126/sciadv.adp5681.
We uncover a superconducting state with partial spin polarization induced by a magnetic field. This state, which we call "magnonic superconductor," lacks a conventional pairing order parameter but is characterized instead by a composite order parameter that represents the binding of electron pairs and magnons. We rigorously demonstrate the existence of magnonic superconductivity with high transition temperature in one-dimensional and two-dimensional Hubbard models with repulsive interaction. We further show that magnonic Cooper pairs can attract to form higher-charge bound states, which can give rise to charge-6 superconductivity.
我们发现了一种由磁场诱导产生部分自旋极化的超导态。这种我们称之为“磁振子超导体”的状态，缺乏传统的配对序参量，而是由一个代表电子对与磁振子结合的复合序参量来表征。我们在具有排斥相互作用的一维和二维哈伯德模型中严格证明了具有高转变温度的磁振子超导性的存在。我们进一步表明，磁振子库珀对能够相互吸引形成更高电荷的束缚态，这可能导致电荷为6的超导性。
