Meier Florian, Loss Daniel
Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.
Phys Rev Lett. 2003 Apr 25;90(16):167204. doi: 10.1103/PhysRevLett.90.167204. Epub 2003 Apr 22.
We analyze transport of magnetization in insulating systems described by a spin Hamiltonian. The magnetization current through a quasi-one-dimensional magnetic wire of finite length suspended between two bulk magnets is determined by the spin conductance which remains finite in the ballistic limit due to contact resistance. For ferromagnetic systems, magnetization transport can be viewed as transmission of magnons, and the spin conductance depends on the temperature T. For antiferromagnetic isotropic spin-1/2 chains, the spin conductance is quantized in units of order (gmu(B))(2)/h at T=0. Magnetization currents produce an electric field and, hence, can be measured directly. For magnetization transport in electric fields, phenomena analogous to the Hall effect emerge.
我们分析了由自旋哈密顿量描述的绝缘系统中的磁化输运。通过悬挂在两个块状磁体之间的有限长度准一维磁线的磁化电流由自旋电导决定，由于接触电阻，自旋电导在弹道极限下保持有限。对于铁磁系统，磁化输运可视为磁振子的传输，且自旋电导取决于温度T。对于反铁磁各向同性自旋-1/2链，在T = 0时，自旋电导以(gμ(B))(2)/h量级的单位进行量子化。磁化电流会产生电场，因此可以直接测量。对于电场中的磁化输运，会出现类似于霍尔效应的现象。
