Insulator-metal transition in CaTiO3 quantum dots induced by ultrafast laser pulses
Insulator-metal transition in CaTiO3 quantum dots induced by ultrafast laser pulses
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超快激光脉冲诱导 CaTiO3 量子点中的绝缘体-金属转变
DOI：
10.1088/1674-1056/ab7d9e
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发表时间：
2020-05
影响因子：
1.7
通讯作者：
Cheng Xin-Lu
中科院分区：
文献类型：
--
作者：
Liu Tong;Zhang Hong;Cheng Xin-Lu
根据瞬态密度泛函理论（TDDFT），我们研究了超快激光脉冲与两种钛酸钙量子点（PCTO-QD和MCTO-QD）之间的相互作用。在局域场效应的作用下，超快激光可以诱导量子点从绝缘体转变为金属。 PCTO-QD最终是金属的，而MCTO-QD在经历金属态后仍然是绝缘体。这是因为PCTO-QDs最外层不饱和原子的稳定性较弱，MCTO-QDs作为势阱的几何构型也会减少激光的损伤。此外，接近量子点固有频率的激光波形往往会导致最高电子能级穿过费米表面。该论文报道，通过调节激光的强度和频率，可以将绝缘量子点转变为金属。通过比较两种 CTO-QD，强调了局部形态的重要性。更重要的是，这是识别钙钛矿材料潜在性能的重要一步。（论文）
According to time-dependent density functional theory (TDDFT), we study the interactions between ultra-fast laser pulses and two kinds of calcium titanate quantum dots (PCTO-QDs and MCTO-QDs). Under the action of localized field effect, ultrafast laser can induce quantum dots to make the transition from insulator to metal. The PCTO-QDs are ultimately metallic, while the MCTO-QDs are still insulator after experiencing metal state. This is bacause the stability of the unsaturated atoms in the outermost layer of PCTO-QDs is weak and the geometric configuration of MCTO-QDs as a potential well will also reduce the damage of laser. Moreover, laser waveforms approaching to the intrinsic frequency of quantum dots tend to cause the highest electron levels to cross the Fermi surface. In this paper, it is reported that the insulating quantum dots can be transformed into metal by adjusting the intensity and frequency of laser. The importance of local morphology is emphasized by comparing two kinds of CTO-QDs. More importantly, it is an important step to identify the potential properties of perovskite materials.(paper)
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