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Ultracold Field Gradient Magnetometry and Transport to Study Correlated Topological Phases

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Technical Report,01 Jul 2015,30 Jun 2016

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Massachusetts Institute of Technology (MIT) Cambridge United States

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The research objective of this proposal is to discover new phases of topological matter by experimentally exploring magnetism and correlation effects in f-electron systems. This project aims at the discovery of emergent topological phases beyond band theory. In order to address these goals, we have developed a unique instrument that couples a top loading cryogen free dilution refrigerator with both traditional solenoid and gradient magnets to our molecular beam epitaxy MBE growth chamber. The coupling is accomplished via an air free interface with a glove box and top loading probe which can additionally couple to variable temperature environments. We can therefore synthesize volatile f-electron based films and transfer them to measurement systems without degradation caused by exposure to air. The milliKelvin temperatures of the dilution unit allow exploration of low temperature dynamics of the f-electron systems and higher temperature environments allow material characterization. The instrument may be seen as the transport and magnetic measurement equivalent to combined MBE-photoemission or MBE-scanning tunneling microscopy systems that have recently made significant impact in the field of topological materials. The additional requirements for device fabrication necessary for transport devices are met by including processing tools in the inert gas glove box environment.

Subject Categories:

  • Crystallography

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