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尤文龙与合作者在Physical Review B上发表研究论文

日期: 2016-06-24     阅读次数:144

标题:Quantum phase transitions in a generalizedcompass chain with three-site interactions

作者:Wen-Long You, Yu-Cheng Qiu, and Andrzej M.Ole?

论文摘要:
Weconsider a class of one-dimensional compass models with an XYZ-YZX type ofthree-site exchange interaction in an external magnetic field. We present theexact solution derived by means of Jordan-Wigner transformation, and study theexcitation gap, spin correlations, and establish the phase diagram. Besides thecanted antiferromagnetic and polarized phases, the three-site interactionsinduce two distinct chiral phases, corresponding to gapless spinless-fermionsystems having two or four Fermi points. We find that the z componentof the scalar chirality operator can act as an order parameter for these chiralphases. We also find that the thermodynamic quantities including the Wilsonratio can characterize the liquid phases. Finally, a nontrivial magnetoelectriceffect is explored, and we show that the polarization can be manipulated by themagnetic field in the absence of electric field.
 
原文链接:http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.214417 





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