Bad-metal relaxation dynamics in a Fermi lattice gas
Bad-metal relaxation dynamics in a Fermi lattice gas
复制标题
费米晶格气体中的不良金属弛豫动力学
作者：
Wen;W. McGehee;W. Morong;B. Demarco
传统金属中的电流是由电子携带的，而电子保持着它们各自的特性。坏金属，如一些高温超导体的正常状态，违反了这一假设，它们行为的全貌仍然没有得到解决。在这里，我们报告的现象与坏金属的行为在光晶格哈伯德模型通过测量受激拉曼跃迁激发的质量电流的运输寿命一致。我们证明了弱散射理论和坏金属的关键特性不兼容：异常电阻率缩放与T-线性行为一致，非相干传输的发病，和方法的莫特-Ioffe-Regel限制。我们的工作展示了一种直接的方法来确定传输寿命，这是理论上的关键，但很难在材料中测量，并暴露坏金属行为的最小成分。有害金属电阻率的起源是凝聚态物理学中一个长期存在的问题。在这里，作者展示了光学晶格中费米子钾原子在很宽的温度范围内的反常电阻率、输运寿命和与坏金属行为一致的弛豫动力学。
Electrical current in conventional metals is carried by electrons that retain their individual character. Bad metals, such as the normal state of some high-temperature superconductors, violate this scenario, and the complete picture for their behavior remains unresolved. Here, we report phenomena consistent with bad-metal behaviour in an optical-lattice Hubbard model by measuring the transport lifetime for a mass current excited by stimulated Raman transitions. We demonstrate incompatibility with weak-scattering theory and key characteristics of bad metals: anomalous resistivity scaling consistent with T-linear behavior, the onset of incoherent transport, and the approach to the Mott–Ioffe–Regel limit. Our work demonstrates a direct method for determining the transport lifetime, which is critical to theory but difficult to measure in materials, and exposes minimal ingredients for bad-metal behavior. The origin of bad-metal resistivity is a long-standing problem for condensed matter physics. Here the authors show anomalous resistivity, transport lifetime, and relaxation dynamics consistent with bad-metal behavior over a wide range of temperature for fermionic potassium atoms in optical lattices.
影响因子：
19.6
作者：
U. Schneider;L. Hackermüller;Jens Philipp Ronzheimer;S. Will;Simon Braun;T. Best;I. Bloch;E. Demler;S. Mandt;D. Rasch;A. Rosch
通讯作者：
U. Schneider;L. Hackermüller;Jens Philipp Ronzheimer;S. Will;Simon Braun;T. Best;I. Bloch;E. Demler;S. Mandt;D. Rasch;A. Rosch