1. InAs-Al Hybrid Devices Passing the Topological Gap Protocol
- Author
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Aghaee, Morteza, Akkala, Arun, Alam, Zulfi, Ali, Rizwan, Ramirez, Alejandro Alcaraz, Andrzejczuk, Mariusz, Antipov, Andrey E, Aseev, Pavel, Astafev, Mikhail, Bauer, Bela, Becker, Jonathan, Boddapati, Srini, Boekhout, Frenk, Bommer, Jouri, Hansen, Esben Bork, Bosma, Tom, Bourdet, Leo, Boutin, Samuel, Caroff, Philippe, Casparis, Lucas, Cassidy, Maja, Christensen, Anna Wulf, Clay, Noah, Cole, William S, Corsetti, Fabiano, Cui, Ajuan, Dalampiras, Paschalis, Dokania, Anand, de Lange, Gijs, de Moor, Michiel, Saldaña, Juan Carlos Estrada, Fallahi, Saeed, Fathabad, Zahra Heidarnia, Gamble, John, Gardner, Geoff, Govender, Deshan, Griggio, Flavio, Grigoryan, Ruben, Gronin, Sergei, Gukelberger, Jan, Heedt, Sebastian, Zamorano, Jesús Herranz, Ho, Samantha, Holgaard, Ulrik Laurens, Nielsen, William Hvidtfelt Padkær, Ingerslev, Henrik, Krogstrup, Peter Jeppesen, Johansson, Linda, Jones, Jeffrey, Kallaher, Ray, Karimi, Farhad, Karzig, Torsten, King, Cameron, Kloster, Maren Elisabeth, Knapp, Christina, Kocon, Dariusz, Koski, Jonne, Kostamo, Pasi, Kumar, Mahesh, Laeven, Tom, Larsen, Thorvald, Li, Kongyi, Lindemann, Tyler, Love, Julie, Lutchyn, Roman, Manfra, Michael, Memisevic, Elvedin, Nayak, Chetan, Nijholt, Bas, Madsen, Morten Hannibal, Markussen, Signe, Martinez, Esteban, McNeil, Robert, Mullally, Andrew, Nielsen, Jens, Nurmohamed, Anne, O'Farrell, Eoin, Otani, Keita, Pauka, Sebastian, Petersson, Karl, Petit, Luca, Pikulin, Dima, Preiss, Frank, Perez, Marina Quintero, Rasmussen, Katrine, Rajpalke, Mohana, Razmadze, Davydas, Reentila, Outi, Reilly, David, Rouse, Richard, Sadovskyy, Ivan, Sainiemi, Lauri, Schreppler, Sydney, Sidorkin, Vadim, Singh, Amrita, Singh, Shilpi, Sinha, Sarat, Sohr, Patrick, Stankevič, Tomaš, Stek, Lieuwe, Suominen, Henri, Suter, Judith, Svidenko, Vicky, Teicher, Sam, Temuerhan, Mine, Thiyagarajah, Nivetha, Tholapi, Raj, Thomas, Mason, Toomey, Emily, Upadhyay, Shivendra, Urban, Ivan, Vaitiekėnas, Saulius, Van Hoogdalem, Kevin, Viazmitinov, Dmitrii V., Waddy, Steven, Van Woerkom, David, Vogel, Dominik, Watson, John, Weston, Joseph, Winkler, Georg W., Yang, Chung Kai, Yau, Sean, Yi, Daniel, Yucelen, Emrah, Webster, Alex, Zeisel, Roland, and Zhao, Ruichen
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Condensed Matter - Mesoscale and Nanoscale Physics ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,FOS: Physical sciences - Abstract
We present measurements and simulations of semiconductor-superconductor heterostructure devices that are consistent with the observation of topological superconductivity and Majorana zero modes. The devices are fabricated from high-mobility two-dimensional electron gases in which quasi-one-dimensional wires are defined by electrostatic gates. These devices enable measurements of local and non-local transport properties and have been optimized via extensive simulations to ensure robustness against non-uniformity and disorder. Our main result is that several devices, fabricated according to the design's engineering specifications, have passed the topological gap protocol defined in Pikulin \textit{et al.} [arXiv:2103.12217]. This protocol is a stringent test composed of a sequence of three-terminal local and non-local transport measurements performed while varying the magnetic field, semiconductor electron density, and junction transparencies. Passing the protocol indicates a high probability of detection of a topological phase hosting Majorana zero modes as determined by large-scale disorder simulations. Our experimental results are consistent with a quantum phase transition into a topological superconducting phase that extends over several hundred millitesla in magnetic field and several millivolts in gate voltage, corresponding to approximately one hundred micro-electron-volts in Zeeman energy and chemical potential in the semiconducting wire. These regions feature a closing and re-opening of the bulk gap, with simultaneous zero-bias conductance peaks at \textit{both} ends of the devices that withstand changes in the junction transparencies. The extracted maximum topological gaps in our devices are 20-$60\,\mu$eV. This demonstration is a prerequisite for experiments involving fusion and braiding of Majorana zero modes., Comment: Added: a second device design; data from an additional device with larger topological gap; further testing of the TGP via simulations; links to a repo containing the raw data and analysis scripts necessary to reproduce all figures containing experimental or simulated data
- Published
- 2022
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