Cooperative photoinduced metastable phase control in strained manganite films.
Cooperative photoinduced metastable phase control in strained manganite films.
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DOI：
10.1038/nmat4695
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发表时间：
2015-12
期刊：
影响因子：
41.2
通讯作者：
Jingdi Zhang;Jingdi Zhang;X. Tan;Mengkun Liu;Mengkun Liu;S. Teitelbaum;Kirk Post;F. Jin
中科院分区：
文献类型：
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作者：
Jingdi Zhang;Jingdi Zhang;X. Tan;Mengkun Liu;Mengkun Liu;S. Teitelbaum;Kirk Post;F. Jin
凝聚态物理的一个主要挑战是对量子相的主动控制。脉冲电磁场的动态控制可以克服能量障碍，使其进入热不可及的瞬态或亚稳态。在这里，我们证明了应变工程调谐la2 / 3ca1 / 3mno3进入一个具有极端光敏感性的紧急电荷有序绝缘相，其中即使一个光脉冲也可以启动过渡到长寿命的亚稳态隐藏金属相。全面的单次脉冲激发测量表明，这种转变是协同的、超快的，需要一个临界的吸收光子密度来激活局部电荷激发，从而介导磁晶格耦合，从而稳定金属相。这些结果表明，应变工程可以将应急功能调整到近端宏观状态，从而实现动态超快光学相位切换和控制。
A major challenge in condensed-matter physics is active control of quantum phases,. Dynamic control with pulsed electromagnetic fields can overcome energetic barriers, enabling access to transient or metastable states that are not thermally accessible,,. Here we demonstrate strain-engineered tuning of La2/3Ca1/3MnO3into an emergent charge-ordered insulating phase with extreme photo-susceptibility, where even a single optical pulse can initiate a transition to a long-lived metastable hidden metallic phase. Comprehensive single-shot pulsed excitation measurements demonstrate that the transition is cooperative and ultrafast, requiring a critical absorbed photon density to activate local charge excitations that mediate magnetic–lattice coupling that, in turn, stabilize the metallic phase. These results reveal that strain engineering can tune emergent functionality towards proximal macroscopic states to enable dynamic ultrafast optical phase switching and control.