Department of Complex Matter, Jozef Stefan Institute, Jamova 39, Ljubljana SI-1000, Slovenia.
Science. 2014 Apr 11;344(6180):177-80. doi: 10.1126/science.1241591.
Hidden states of matter may be created if a system out of equilibrium follows a trajectory to a state that is inaccessible or does not exist under normal equilibrium conditions. We found such a hidden (H) electronic state in a layered dichalcogenide crystal of 1T-TaS2 (the trigonal phase of tantalum disulfide) reached as a result of a quench caused by a single 35-femtosecond laser pulse. In comparison to other states of the system, the H state exhibits a large drop of electrical resistance, strongly modified single-particle and collective-mode spectra, and a marked change of optical reflectivity. The H state is stable until a laser pulse, electrical current, or thermal erase procedure is applied, causing it to revert to the thermodynamic ground state.
如果一个处于非平衡状态的系统沿着一条无法达到的轨迹行进，或者在正常平衡条件下不存在，那么物质的隐藏状态就可能被创造出来。我们在 1T-TaS2（二硫化钽的三角相）的层状二卤代物晶体中发现了这样一个隐藏的（H）电子态，这是由于单个 35 飞秒激光脉冲引起的淬火而达到的。与系统的其他状态相比，H 态表现出电阻的大幅下降、强烈修正的单粒子和集体模式谱以及光学反射率的明显变化。H 态是稳定的，直到激光脉冲、电流或热擦除程序被应用，导致它回到热力学基态。
