We have investigated the possibility of extending the stability range of the biaxial nematic phase by adding an off-centre dipole of various strengths and orientations to elongated biaxial Gay–Berne (GB) mesogens yielding a relatively narrow biaxial nematic (N_bx) phase, and a smectic (S_bx) phase when dipole-less. The effect of dipoles is not easy to predict, and our previous investigations have shown the limited benefits of having a central dipole. Here we show, employing molecular dynamics (MD) simulations, that a not too strong off-centre dipole positioned along the longest axis of the nematogen can extend the temperature range of stability of the biaxial nematic phase, also shifting it towards lower temperatures.

中文翻译：

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偏心液晶元偶极子可以扩展双轴向列范围吗？†

我们已经研究了通过向拉长的双轴盖伊－伯恩（GB）液晶元中添加各种强度和取向的偏心偶极子来扩展双轴向列相稳定性的可能性，从而产生相对较窄的双轴向列相（N _bx），并且无偶极_子时的近晶（S _bx）相。偶极子的影响不容易预测，而且我们以前的研究表明，拥有中心偶极子的好处有限。在这里，我们使用分子动力学（MD）模拟表明，沿线虫原最长轴定位的偏心偶极子不会太强，可以扩展双轴向列相稳定的温度范围，还将其移向更低的温度。