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arXiv 2501.00518hep-thcond-mat.str-elhep-phnucl-th
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一维相对论场论的三临界行为

Tricritical behavior of a relativistic field theory in one dimension

Heron Caldas, A. L. Mota

AI总结:

本文研究一维Gross-Neveu型模型中掺杂和Zeeman磁场对三临界行为的影响,发现磁场可诱导无能隙-有能隙相变,并探讨了非均匀凝聚体对三临界点的作用。

摘要:

本文分析了一类在零温度和零化学势下表现出自发对称性破缺的一维(1D)场论中的三临界行为。在无质量费米子的Gross-Neveu(GN)型模型中,离散手征对称性发生自发破缺。掺杂后,该对称性在临界化学势处恢复。我们研究了在外部恒定Zeeman磁场$B_0$作用下,温度对这一掺杂一维系统的影响。我们发现$B_0$抑制了在某些化学势取值下存在的无能隙行为,并能够在临界场强处诱导无能隙-有能隙相变。我们还讨论了在Ginzburg-Landau展开框架内考虑非均匀凝聚体对三临界点的影响。

英文摘要:

The tricritical behavior in a class of one-dimensional (1D) field theories that exhibit spontaneous symmetry breaking at zero temperature and chemical potential is analyzed. In the Gross-Neveu (GN)-type models of massless fermions the discrete chiral symmetry is spontaneously broken. After doping, the symmetry is restored at a critical chemical potential. We investigate the temperature effects on this doped 1D system under an external constant Zeeman magnetic field $B_0$. We find that $B_0$ suppresses the gapless behavior present for certain values of chemical potential and is able to induce a gapless-gapped phase transition at a critical field strength. We also discuss about the consequences of the consideration of inhomogeneous condensates to the tricritical point, within the Ginzburg-Landau expansion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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