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| Main Authors: | , |
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| Format: | Preprint |
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2023
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| Online Access: | https://arxiv.org/abs/2311.02165 |
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| _version_ | 1866909492341374976 |
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| author | Liao, Yunxiang Hsu, Yi-Ting |
| author_facet | Liao, Yunxiang Hsu, Yi-Ting |
| contents | Experimental efforts on topological superconductivity (TSC) have primarily focused on the detection of Majorana boundary modes, while the bulk properties of TSC - particularly in two dimensions (2D) - remain relatively underexplored. In this work, we theoretically propose a distinctive signature in the spectral function away from the boundaries, capable of detecting 2D chiral p-wave TSC induced in a Rashba spin-orbit-coupled (SOC) heterostructure. This signature can be probed experimentally through angle-resolved photoemission spectroscopy or momentum- and energy-resolved tunneling spectroscopy under a weak magnetic field B. We show that within the topological phase, the spectral intensity of the lowest superconducting band at small momenta k~0 brightens (darkens) linearly with increasing B, whereas it darkens (brightens) in the trivial phase when the Rashba system is electron- (hole-) doped. This sharp contrast arises from the phase-space Berry curvature (BC) of Bogoliubov quasiparticles, a novel quantum geometric property that generalizes the conventional momentum-space BC. The effect of this phase-space BC can also be detected by the differential conductance away from the boundaries. Our falsifiable prediction provides an experimental avenue for detecting Rashba-induced chiral p-wave TSC without relying on Majorana mode detection, addressing a key challenge in the realization of 2D TSC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_02165 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Detecting Topological Superconductivity via Berry Curvature Effects in Spectral Functions Liao, Yunxiang Hsu, Yi-Ting Superconductivity Experimental efforts on topological superconductivity (TSC) have primarily focused on the detection of Majorana boundary modes, while the bulk properties of TSC - particularly in two dimensions (2D) - remain relatively underexplored. In this work, we theoretically propose a distinctive signature in the spectral function away from the boundaries, capable of detecting 2D chiral p-wave TSC induced in a Rashba spin-orbit-coupled (SOC) heterostructure. This signature can be probed experimentally through angle-resolved photoemission spectroscopy or momentum- and energy-resolved tunneling spectroscopy under a weak magnetic field B. We show that within the topological phase, the spectral intensity of the lowest superconducting band at small momenta k~0 brightens (darkens) linearly with increasing B, whereas it darkens (brightens) in the trivial phase when the Rashba system is electron- (hole-) doped. This sharp contrast arises from the phase-space Berry curvature (BC) of Bogoliubov quasiparticles, a novel quantum geometric property that generalizes the conventional momentum-space BC. The effect of this phase-space BC can also be detected by the differential conductance away from the boundaries. Our falsifiable prediction provides an experimental avenue for detecting Rashba-induced chiral p-wave TSC without relying on Majorana mode detection, addressing a key challenge in the realization of 2D TSC. |
| title | Detecting Topological Superconductivity via Berry Curvature Effects in Spectral Functions |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2311.02165 |