论文标题
fermion诱导的量子临界点
Fermion-induced quantum critical point in the Landau-Devonshire model
论文作者
论文摘要
波动可以大大改变相变的性能。一个例子是fermion诱导的量子临界点（FIQCP），其中无质量的dirac fermions的波动将假定的Landau-de Gennes一阶相变（FOPT）与立方玻色子相互作用变成连续的。然而，对于兰道 - 德文郡的理论而言，它是另一个非常大的FOPT的特征，尚未探讨其在耦合下的命运。在这里，我们发现了一种新型的FIQCP，其中Dirac Fermion的波动围绕着玻色子Landau-Devonshire Fopt绕过连续的相变。通过使用功能性重归其化组分析，我们确定了该FIQCP出现的条件。此外，我们指出，目前的FIQCP可能是一个超对称的临界点。我们最终表明，低温相图可以提供不同的实验证据来检测此FIQCP。
Fluctuations can change the phase transition properties drastically. An example is the fermion-induced quantum critical point (FIQCP), in which fluctuations of the massless Dirac fermions turn a putative Landau-de Gennes first-order phase transition (FOPT) with a cubic boson interaction into a continuous one. However, for the Landau-Devonshire theory, which characterizes another very large class of FOPTs, its fate under the coupling with extra fluctuations has not been explored. Here, we discover a new type of FIQCP, in which the Dirac fermion fluctuations round the boson Landau-Devonshire FOPT into a continuous phase transition. By using the functional renormalization group analyses, we determine the condition for the appearance of this FIQCP. Moreover, we point out that the present FIQCP can be a supersymmetric critical point. We finally show that the low-temperature phase diagram can provide distinct experimental evidences to detect this FIQCP.
