电子移位促进了不化障碍的发生.
Dasol Kim1,2, Sungwon Kim3,4, Jisu Jung5
1Aachen. I. Institute of Physics, Physics of Novel Materials, RWTH-Aachen University, 52056 Aachen, Germany.
ACS nano
|February 26, 2025
概括
对于神经形态工程来说,原子乱可以在没有融化的情况下发生,这挑战了传统理论. 移位的电子可以实现更快的破坏,提高相变材料的能量效率.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 计算材料科学科学 计算材料科学
背景情况:
- 材料中的原子乱可以实现高级功能,如相变存储器和光子计算,这对于神经形态工程至关重要.
- 传统上与融相关的干扰过程中的高能耗限制了数据可靠性和设备集成效率.
研究的目的:
- 挑战传统的化灭理论的原子扰乱.
- 为了研究不同材料在同时和同条件下的破坏的动力学.
- 阐明电子结构在干扰过程中的作用及其对能源效率的影响.
主要方法:
- 在纯 Sb,Ag-In-Sb-Te,In 和 InSb.中对干扰时间的实验调查.
- 分析电子结构和粘合对原子移动性的影响的理论计算.
- 在具有不同点和激光吸收率的材料中比较扰乱行为.
主要成果:
- 干扰时间差异很大,Sb,Ag-In-Sb-Te和In的干扰速度比InSb慢得多.
- 理论计算显示,非局部化的电子促进了低于点的键长度修改,使原子的移位成为可能.
- 由非定位电子驱动的代价和金属结合,允许在不化的情况下进行破坏,解释了观察到的破坏速率差异.
结论:
- 在点以下可以发生原子乱,这是由电子性质而不是仅仅热效应驱动的.
- 移位电子和特定的键类型 (元价,金属) 是有效的低能原子破坏的关键因素.
- 节能相变材料的设计原则应该优先考虑电子移位,而不是高点.
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