{"id":1189075,"date":"2026-10-07T13:55:14","date_gmt":"2026-10-07T20:55:14","guid":{"rendered":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/publication\/realization-of-very-high-mobility-inas-quantum-wells-on-inp-substrates-through-convex-inalas-graded-buffer-optimization\/"},"modified":"2026-10-21T08:37:03","modified_gmt":"2026-10-21T15:37:03","slug":"realization-of-very-high-mobility-inas-quantum-wells-on-inp-substrates-through-convex-inalas-graded-buffer-optimization","status":"publish","type":"msr-research-item","link":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/publication\/realization-of-very-high-mobility-inas-quantum-wells-on-inp-substrates-through-convex-inalas-graded-buffer-optimization\/","title":{"rendered":"Realization of Very High Mobility InAs Quantum Wells on InP Substrates Through Convex InAlAs Graded Buffer Optimization"},"content":{"rendered":"\n\n\n<p class=\"wp-block-paragraph\">Due to strong spin-orbit coupling, large Land&#8217;e <math><mi>g<\/mi><\/math>-factor, and a highly transparent interface, the two-dimensional electron gas (2DEG) in InAs quantum wells provides an ideal platform for the exploration of topological superconductivity in hybrid semiconductor-superconductor heterostructures. Reduction of disorder in the semiconductor remains a primary challenge to the disambiguation of subtle interaction effects. Here we demonstrate very high mobility InAs 2DEGs grown on insulating InP substrates. Utilizing a convex compositional grading profile in an InAlAs metamorphic buffer we demonstrate InAs quantum wells with thickness greater than 10 nm without need of Ga-containing cladding layers. We examine structural and electrical transport properties of these heterostructures. Advances in the design of the metamorphic InAlAs buffer result in low-temperature electron mobility exceeding <math><mrow><mn>1.7<\/mn><mo>\u00d7<\/mo><msup><mn>10<\/mn><mn>6<\/mn><\/msup><\/mrow><\/math> cm<math><mn>2<\/mn><\/math> V<math><mrow><mrow><mrow><mo>&#8211;<\/mo><mn>1<\/mn><\/mrow><\/mrow><\/mrow><\/math> s<math><mrow><mrow><mrow><mo>&#8211;<\/mo><mn>1<\/mn><\/mrow><\/mrow><\/mrow><\/math> at 2DEG density <math><mrow><mo>\u2264<\/mo><mn>3.2<\/mn><mo>\u00d7<\/mo><msup><mn>10<\/mn><mn>11<\/mn><\/msup><\/mrow><\/math> cm<math><mrow><mrow><mrow><mo>&#8211;<\/mo><mn>2<\/mn><\/mrow><\/mrow><\/mrow><\/math>, the highest value yet reported for this material system.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Due to strong spin-orbit coupling, large Land&#8217;e g-factor, and a highly transparent interface, the two-dimensional electron gas (2DEG) in InAs quantum wells provides an ideal platform for the exploration of topological superconductivity in hybrid semiconductor-superconductor heterostructures. Reduction of disorder in the semiconductor remains a primary challenge to the disambiguation of subtle interaction effects. Here we [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":[{"type":"text","value":"T. Lindemann","user_id":0},{"type":"text","value":"Rojila Ghimire","user_id":0},{"type":"text","value":"A. Ramirez","user_id":0},{"type":"text","value":"Ahmad Azizimanesh","user_id":0},{"type":"user_nicename","value":"Sergei Gronin","user_id":"36927"},{"type":"user_nicename","value":"Ray Kallaher","user_id":"36924"},{"type":"text","value":"M. 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