Department of Condensed Matter Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
Phys Rev Lett. 2009 Oct 9;103(15):155301. doi: 10.1103/PhysRevLett.103.155301. Epub 2009 Oct 5.
We measured the transverse acoustic impedance of superfluid 3He-B with a wall coated by several layers of 4He. The coating is known to enhance the specularity in quasiparticle scattering by the wall. We found a new anomaly, a bump and a peak, in the temperature dependence of the transverse acoustic impedance. This agrees with a theoretical calculation using a partially specular wall boundary condition. The new anomaly is shown to arise from a change in the surface density of states by coating and the scattering of thermally occupied surface bound states to other states. The change is towards the density of states of Majorana cone in the specular limit.
我们使用涂有多层 4He 的壁来测量超流 3He-B 的横向声阻抗。已知这种涂层可以增强壁对准粒子散射的镜面反射率。我们在横向声阻抗的温度依赖性中发现了一个新的异常，一个凸起和一个峰值。这与使用部分镜面壁边界条件的理论计算相符。新的异常是由涂层引起的表面态密度的变化以及热占据的表面束缚态散射到其他态引起的。这种变化朝着镜面极限中的马约拉纳锥的态密度方向发展。
