Electrical transport in quantum materials and devices

学生将利用低温、高磁场电输运实验探索量子材料和器件中的几种现象。第一堂实验将是用DNA组装的分子电子器件。根据EPSRC赠款EP/P000479/1、EP/P000444/1、EP/N 035496/1和EP/N 035496/2组装器械。学生将：（i）使用电子束光刻法接触DNA组装器件上的金纳米颗粒电触点;（ii）表征包括空纳米间隙的器件和包括差距中的活性功能分子的器件的电传输特性，作为温度和磁场的函数;（iii）研究单分子装置中的电检测磁共振（如果项目早期部分的进展足够的话）。第二类实验建立在Nature Communications 9，56（2018）中报道的结果基础上。学生将：（i）研究修改使用离子液体门控拓扑绝缘体SmB 6的表面状态的填充，以测量表面状态准粒子散射时间对能带填充的依赖性;（ii）探索通过表面状态的导电性测量应用于SmB 6表面的分子自旋散射体的电检测磁共振的可能性。

The student will explore several phenomena in quantum materials and devices using low-temperature, high magnetic field electrical transport experiments.The first class of experiments will be on molecular electronic devices assembled using DNA. Devices are being assembled under EPSRC grants EP/P000479/1, EP/P000444/1, EP/N035496/1 and EP/N035496/2. The student will:(i) use electron beam lithography to contact gold nanoparticle electrical contacts on the DNA-assembled devices;(ii) characterize electrical transport properties of devices including empty nanogaps and devices including an active functional molecule in the gap, as a function of temperature and magnetic field;(iii) study electrically-detected magnetic resonance in single-molecule devices (if the progress in earlier parts of the project is sufficient).The second class of experiments builds on results reported in Nature Communications 9, 56 (2018). The student will:(i) investigate modifying the filling of the surface state of the topological insulator SmB6 using ionic liquid gating, to measure the dependence of the surface state quasiparticle scattering time on band filling;(ii) explore the possibility of measuring electrically-detected magnetic resonance of molecular spin scatterers applied to the surface of SmB6 via the conductivity of the surface state.