Acquisition of a Sorption-Pumped Dilution Refrigerator System to Investigate Quantum Transport in Nanostructures and for Student Training

9975943 Marcus该资助将部分支持购买一种新设计的稀释制冷机，该制冷机使用一对计算机控制的吸附泵，以合理的冷却功率（在100 mK时为50 m W）达到毫开尔文温度，而无需使用外部机械泵来循环3 He/4 He混合物。 这种新颖的设计大大简化了操作，并有可能大大减少振动加热。 这两个特点是重要的研究和教育计划在我们的实验室，如下所述。 这种新设计的最佳支持和最可靠的版本包括蒸汽屏蔽杜瓦瓶，10/12 T超导磁体，气体处理和控制电子设备。 两个新的研究项目将直接受益于新的稀释冰箱。 (1)绝热量子电荷泵;和（2）纳米级电镀。稀释冰箱将位于先进材料实验室的扩展实验室设施，以确保研究生和本科生都有机会进行自己的实验。 在这个意义上，“运行”通常意味着制造他们自己的样品，通常使用NSF斯坦福大学的通知设施-事实上，我们实验室的几个本科生现在在这个设施中有用户赠款-进行低温测量，分析数据，与理论比较，并撰写报告，大概是为了出版。该设备将显着提高研究能力和教师和学生的教育机会。

9975943MarcusThis grant will provide partial support for the acquisition of a new design of dilution refrigerator that uses a pair of computer-controlled sorption pumps to achieve millikelvin temperatures with reasonable cooling power ( 50m W at 100mK), without the use of external mechanical pumps to circulate the 3He/4He mixture. This novel design offers greatly simplified operation, and the possibility of significantly reduced vibrational heating. Both of these features are important to the research and educational programs in our laboratory, as described below. The best-supported and most reliable version of this new design includes a vapor shielded dewar, 10/12 T superconducting magnet, gas handling, and control electronics. Two new research projects will benefit directly from the new dilution refrigerator. (1) Adiabatic Quantum Pumping of Charge; and (2) Nanoscale Electroplating.The dilution refrigerator will be located in the expanded laboratory facilities in the Laboratory for Advanced Materials to assure that both graduate and undergraduate students have an opportunity to run their own experiment. "Run" in this sense typically means fabricate their own samples, usually using the NSF Stanford Notification Facility-several undergraduates from our lab in fact now have user grants in this facility-carry out the low-temperature measurements, analyze the data, compare to theory, and write up a report, presumably for publication.The equipment will significantly enhance the research capabilities and educational opportunities of faculty and students.