Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session N44: Topological Superconductivity in Engineered HeterostructuresInvited Live Streamed
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Sponsoring Units: DCMP Chair: Allan MacDonald, University of Texas at Austin Room: McCormick Place W-375C |
Wednesday, March 16, 2022 11:30AM - 12:06PM |
N44.00001: Emergent Majorana States in Defect-Free Bottom-Up Constructed Atomic-Scale Magnet-Superconductor Hybrid Systems Invited Speaker: Roland M Wiesendanger Majorana states in atomic-scale magnet-superconductor hybrid systems have recently become of great interest because they can encode topological qubits and ultimately provide the basis for topological quantum computation. However, an unambiguous identification of Majorana states requires well defined model-type platforms and appropriate experimental tools for their investigation. Our experimental approach is based on the use of STM-based single atom manipulation techniques in order to fabricate well-defined defect-free 1D atomic chains as well as 2D arrays of magnetic adatoms on s-wave superconductor substrates with high spin-orbit coupling [1-3]. Spin-polarized STM measurements [4] allow us to reveal the presence of collinear [5] or non-collinear [1] spin textures, i.e. spin spiral ground states, of the 1D chains. Simultaneously performed scanning tunneling spectroscopy on the magnetic atom chains proximity-coupled to the superconducting substrates reveal the evolution of the spatially and energetically resolved local density of states as well as the emergence of zero-energy bound states at both chain ends above a critical chain length for Fe chains on Re(0001) [1] as well as Mn chains on Nb(110) [6]. Based on the exact knowledge of the geometrical, electronic, and spin structure of the magnetic chain – superconductor hybrid system, the experimental results can be compared rigorously with ab-initio and model-type tight-binding calculations supporting the interpretation of the spectroscopic signatures at the ends of the chains as Majorana states [1,6-8]. |
Wednesday, March 16, 2022 12:06PM - 12:42PM |
N44.00002: Topological superconductivity in a van der Waals heterostructure Invited Speaker: Peter Liljeroth Van der Waals (vdW) heterostructures have emerged as a playground for realizing and engineering exotic quantum states not found in naturally occurring materials. Use of vdW heterostructures allows combining materials with very different properties. In these designer heterostructures, the desired physics emerges through the engineered interactions between the different components.The use of vdW heterostructures further facilitates using these effects in future device structures and potentially allow further control through e.g. electrostatic gating. |
Wednesday, March 16, 2022 12:42PM - 1:18PM |
N44.00003: New perspectives for Majorana zero modes in one-dimensional topological superconductors Invited Speaker: Stephan Rachel Magnet-superconductor hybrid (MSH) systems represent promising platforms to host Majorana zero modes (MZMs), the elemental building blocks for fault-tolerant quantum computers. Theoretical description of such MSH structures is mostly based on simplified models, not accounting for the complexity of real materials. Here, based on density functional theory, we derive an effective superconducting 80-band model to study an MSH system consisting of a magnetic manganese chain on the s wave superconductor niobium. For a wide range of values of the superconducting order parameter, the system is a topological superconductor, with MZMs exhibiting non-universal spatial patterns and a drastic accumulation of spectral weight on both sides along the magnetic chain. Performing scanning tunneling spectroscopy experiments on the same system, we observe a spatial structure in the low-energy local density of states that is consistent with the theoretical results. Our results open a first-principle approach to the discovery of topological superconductors. |
Wednesday, March 16, 2022 1:18PM - 1:54PM |
N44.00004: Majorana Bound States Induced by Antiferromagnetic Skyrmion Textures Invited Speaker: Daniel Loss
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Wednesday, March 16, 2022 1:54PM - 2:30PM |
N44.00005: Engineering of Topological Superconductivity in Magnet-Superconductor Hybrid Structures Invited Speaker: Dirk K Morr Atomic manipulation and interface engineering techniques have provided an intriguing approach to custom-designing topological superconductors and the ensuing Majorana zero modes, representing a paradigm for the realization of topological quantum computing and topology-based devices. Magnet-superconductor hybrid (MSH) systems have proven to be experimentally suitable to engineer topological superconductivity through the control of both the complex structure of its magnetic layer and the interface properties of the superconducting surface. |
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