论文标题
用奇怪的金属射击噪音
Shot noise in a strange metal
论文作者
论文摘要
从高温超导体到重金属的材料，已经观察到了奇怪的金属行为。在常规金属中，电流由准粒子携带。尽管已经提出在奇怪的金属中不存在准粒子，但缺乏直接的实验证据。我们测量了射击噪声，以探测沉重的fermion奇怪金属YBRH2SI2纳米线中电流激发的粒度。与常规金属相比，这些纳米线中的射击噪声被强烈抑制。这种抑制不能归因于费米液体中的电子 - 音波或电子 - 电子相互作用，这表明我们探索的奇怪金属方向上未定义明确的准粒子携带电流。我们的工作为对其他奇怪金属的类似研究奠定了基础。
Strange-metal behavior has been observed in materials ranging from high-temperature superconductors to heavy fermion metals. In conventional metals, current is carried by quasiparticles; although it has been suggested that quasiparticles are absent in strange metals, direct experimental evidence is lacking. We measured shot noise to probe the granularity of the current-carrying excitations in nanowires of the heavy fermion strange metal YbRh2Si2. When compared with conventional metals, shot noise in these nanowires is strongly suppressed. This suppression cannot be attributed to either electron-phonon or electron-electron interactions in a Fermi liquid, which suggests that the current is not carried by well-defined quasiparticles in the strange-metal regime that we probed. Our work sets the stage for similar studies of other strange metals.
