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arXiv 2602.19972cond-mat.str-elcond-mat.mtrl-sci
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非费米液体特征在应变调控的金属-绝缘体转变中线图晶格中的表现

Non Fermi liquid signatures across strain engineered metal-insulator transition in line-graph lattices

University of Iowa(爱荷华大学);SRM Institute of Science and Technology(SRM科学与技术学院)

Shashikant Singh Kunwar, Madhuparna Karmakar

AI总结:

本文研究了应变调控下线图晶格中金属-绝缘体转变的相变特征,揭示了非费米液体金属相和磁性相关绝缘体的共存及热波动的影响。

摘要:

通过外部可调扰动控制关联电子系统的性质和功能一直是量子凝聚态物理中的重要目标。最近,应变电子学被证明是一种能够通过重构其电子能带结构来决定材料量子相变和转变的外部控制手段。在平坦带线图晶格的背景下,应变电子学被发现能够引发非平凡的相变。本文报告了在电子相互作用-应变-温度空间中,利布/柯克伍德相互转换的相变和热尺度。基于这些线图晶格在应变调节相互转换中的热力学、光谱学和输运特征,我们通过非微扰计算确定了低温相和热转变尺度。在低温下,相互作用-应变平面由磁性相关绝缘体、平坦带诱导的弱瞬时局部化绝缘体和非费米液体金属相构成,热波动有助于稳定共存的磁性相关性。除了量化该系统中的磁性转变尺度外,我们关于光谱学和输运特征的结果还提取了应变调节的金属-绝缘体转变和过渡尺度,这些尺度表现出可变的输运尺度指数。

英文摘要:

Controlling the properties and thus the functionalities of correlated electron systems via externally tunable perturbations has always remained a cherished goal in quantum condensed matter physics. Recently, straintronics has proved to be one such external control which can dictate the quantum phases and transitions in materials via the reconstruction of their electronic band structure. A particularly intriguing scenario arises in the context of flat band line-graph lattices wherein straintronics is found to bring forth non trivial phase transitions. This paper reports the phase transitions and thermal scales across the Lieb/Kagome interconversion in the electronic interaction-strain-temperature space. Based on the thermodynamic, spectroscopic and transport signatures across the strain tuned interconversion of these line-graph lattices we have mapped out the low temperature phases and thermal transition scales, numerically determined using non perturbative calculations. While at the low temperatures, interaction-strain plane is spanned by magnetically correlated insulators, flat band induced weak transiently localized insulators and non Fermi liquid metallic phases, thermal fluctuations aid in to stabilize coexistent magnetic correlations. Apart from quantifying the magnetic transition scales in this system our results on the spectroscopic and transport signatures distill the strain tuned metal-insulator transition and crossover scales which exhibit variable transport scaling exponents.

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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