论文标题
量子孔状状态在重铁孔超导体uru $ _2 $ si $ _2 $
Quantum-well states at the surface of the heavy-fermion superconductor URu$_2$Si$_2$
论文作者
论文摘要
电子可以在金属表面形成二维电子气体，侧向限制导致量子孔状态。已经观察到高度巡回电子的这种状态，但仍然是一个开放的问题，即是否可以通过强相关电子形成量子孔状态。在这里，我们使用Millikelvin扫描隧道谱图研究了重毛顶超导体URU $ _2 $ SI $ _2 $的表面上的原子露台。我们观察到二维重费（2DHF），其有效质量是自由电子质量的17倍，该质量量化了量子，该质量由MEV的一小部分分开。表面的超导性被大量诱导到2DHF中。我们的结果为实现相关量子材料的量子井状态提供了新的途径。
Electrons can form a two-dimensional electron gas at metal surfaces, where lateral confinement leads to quantum-well states. Such states have been observed for highly itinerant electrons, but it remains an open question whether quantum-well states can be formed from strongly correlated electrons. Here we study atomically flat terraces on surfaces of the heavy-fermion superconductor URu$_2$Si$_2$ using millikelvin scanning tunneling spectroscopy. We observe two-dimensional heavy fermions (2DHF) with an effective mass 17 times the free electron mass that form quantized states separated by a fraction of a meV. Superconductivity at the surface is induced by the bulk into the 2DHF. Our results provide a new route to realize quantum well states in correlated quantum materials.
