Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W42: Magnet-Superconductor Hybrid Systems as a Platform for Non-Trivial Topological Superconducting PhasesInvited
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Sponsoring Units: DCMP Chair: Pavlo Sukhachov, University of California Santa Cruz Room: Ballroom B |
Thursday, March 7, 2024 3:00PM - 3:36PM |
W42.00001: Atom-by-Atom Fabricated Magnet-Superconductor Hybrid Systems as Ideal Platforms for Realizing Topological Superconductivity and Associated Majorana Zero Modes Invited Speaker: Roland M Wiesendanger One of the major challenges for the future of quantum computation is the drastic reduction of the error rate associated with quantum decoherence phenomena. Robust topological qubits, as realized by Majorana states, may ultimately provide a solution and constitute a new direction of topological quantum computation. However, an unambiguous identification of Majorana states requires well defined model-type platforms. |
Thursday, March 7, 2024 3:36PM - 4:12PM |
W42.00002: Moire-Enabled Topological Superconductivity Invited Speaker: Jose Lado
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Thursday, March 7, 2024 4:12PM - 4:48PM |
W42.00003: Two-dimensional Shiba lattices as a platform for crystalline topological superconductivity Invited Speaker: Titus Neupert Localized or propagating Majorana boundary modes are the key feature of topological superconductors. They are rare in naturally-occurring compounds, but the tailored manipulation of quantum matter offers opportunities for their realization. Specifically, lattices of Yu-Shiba-Rusinov bound states – Shiba lattices – that arise when magnetic adatoms are placed on the surface of a conventional superconductor can be used to create topological bands within the superconducting gap of the substrate. I will show how scanning tunnelling microscopy is used to create and probe adatom lattices with single atom precision we reveal two signatures consistent with the realization of topological superconductors. One of the example strucutres I will discuss has edge modes as well as higher-order corner states, another example has symmetry-protected bulk nodal points. The topological character and boundary modes are protected by the spatial symmetries of the adatom lattice. Our results highlight the potential of Shiba lattices as a platform to design the topology and sample geometry of 2D superconductors. |
Thursday, March 7, 2024 4:48PM - 5:24PM |
W42.00004: Quantum Engineering Topological Superconductivity and Quantum Algorithms in Magnet-Superconductor Hybrid Systems Invited Speaker: Dirk K Morr The emergence of Majorana zero modes in topological superconductors might hold the key for realizing topological quantum computing and topology-based devices. Magnet-superconductor hybrid (MSH) systems have proven to be experimentally versatile platforms for the quantum engineering of topological superconductivity by custom-designing the complex structure of their magnetic layer. In this talk I will show how intriguing topological phases -- ranging from topological nodal point superconductivity (TNPSC) [1,2] to higher order topological superconductivity (HOTSC) [3] -- can be realized in two-dimensional MSH systems by using checkerboard, spiral, antiferromagnetic or stacked magnetic structures. The nodal electronic structure of TNPSC phases leads to a unique and edge-dependent emergence of low-energy modes, which can be used to identify the underlying topology. Moreover, I will demonstrate that the existence of HOTSC phases, and of the associated Majorana corner modes, sensitively depends on the edge terminations of MSH islands, providing an intriguing ability to tune the system between trivial and topological phases using atomic manipulation techniques. Finally, I will show how the ability to manipulate the magnetic structure in MSH systems can be employed to implement topological quantum algorithms using Majorana zero modes [4]. |
Thursday, March 7, 2024 5:24PM - 6:00PM |
W42.00005: Topological superconductivity induced by quantum spin fluctuations Invited Speaker: Asle Sudbø Topological superconductors are associated with the appearance of Majorana bound states, with promising applications in topologically protected quantum computing. In this talk, we present systems where non-collinear, possibly toplogical, spin-textures is interfaced with a normal metal. Through interfacial exchange coupling, spin fluctuations in these gound states mediate an effective electron-electron interaction in the normal metal. We study superconductivity within a weak-coupling approach and solve gap equations both close to the critical temperature and at zero temperature. Special features in the effective electron-electron interaction due to the noncolinearity of the magnetic ground state yield topological superconductivity at the interface. We elucidate the minimal requirements for obtaining topological superconductivity. |
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