Quantum Hall Measurements in InAs Quantum Wells
Discipline: Physics
Session: 1
Room: 4 - Hanover F
Layla Samoné Linda Smith - Norfolk State University
Co-Author(s): Kent Smith, Sandia National Labs, Livermore CA Leroy Salary, Norfolk State University, Norfolk, VA Doyle Temple, Norfolk State University, Norfolk, VA Wei Pan Sandia National Labs, Livermore CA
InAs has emerged as a promising material platform to realize topological superconducting states (TSSs) which can host MQPs: (1) It can form a highly transparent interface with aluminum (Al, a superconductor); (2) the strength of spin-orbit-coupling (SOC) is large and tunable, a key ingredient for realizing TSSs. Indeed, recent work by Microsoft Quantum shows exciting results in InAs-Al hybrid devices that are consistent with the observation of TSSs and MQPs.
In this work, we will present our recent low temperature electronic transport characterization in a high quality InAs quantum well (QW), grown by molecular-beam epitaxy. A specimen of a standard 5mm × 5mm geometry is cleaved from an as-grown wafer. Eight indium contacts are diffused symmetrically around the perimeter of the specimen to form ohmic contacts to the 2D electron gas (2DEG) realized in the InAs QW. The specimen is then cooled down to the liquid helium temperature, and the magneto-resistance Rxx and the Hall resistance Rxy are measured as a function of magnetic (B) fields. Rxx displays the typical Shubnikov-de Haas oscillations. For Rxy, it is linear with B in the low field range but displays quantized plateaus at high B fields.
Our low temperature measurements demonstrate high quality 2DEG in our InAs QW. In the future, we will examine the SOC strength in InAs by analyzing the weak-antilocalization effect. Results from this study will provide critical information for the realization of MQPs.
Funder Acknowledgement(s): CREST Center for Research and Education in Quantum-leap Science and Technology Award Number:2112595, and HBCU-UP Excellence in Research: Single Crystal Growth and Investigation of Novel Exotic Fermion Materials Award Number:1832031
Faculty Advisor: Doyle Temple, datemple@nsu.edu
Role: I produced the 5 mm x 5 mm specimen, including creating the indium contacts. I completed the cooling of the specimen as well.