Antiferromagnetic order in a semiconductor quantum well with spin-orbit coupling

作者：Marinescu D C^*

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2015, 69: 34-38.

DOI：10.1016/j.physe.2015.01.016

• Spin-orbit interaction
• Spin density waves
• Antiferromagnetic

An argument is made on the existence of a low-temperature itinerant antiferromagnetic (AF) spin alignment, rather than persistent helical (PH), in the ground state of a two dimensional electron gas in a semiconductor quantum well with linear spin-orbit Rashba-Dresselhaus interaction at equal coupling strengths, alpha. This result is obtained on account of the opposite-spin single-particle state degeneracy at k = 0 that makes the spin instability possible. A theory of the resulting magnetic phase is formulated within the Hartree-Fock approximation of the Coulomb interaction. In the AF state the direction of the fractional polarization is obtained to be aligned along the displacement vector of the single-particle states.

• 出版日期2015-5