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Baldelli N, Bhattacharya U, González-Cuadra D, Lewenstein M, Graß T. Detecting Majorana Zero Modes via Strong Field Dynamics. ACS OMEGA 2022; 7:47424-47430. [PMID: 36570179 PMCID: PMC9773937 DOI: 10.1021/acsomega.2c07169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
We propose a protocol to detect topological phase transitions of one-dimensional p-wave superconductors from their harmonic emission spectra in strong fields. Specifically, we identify spectral features due to radiating edge modes, which characterize the spectrum and the density of states in the topological phase and are absent in the trivial phase. These features allow us to define a measurable signature, obtained from emission measurements, that unambiguously differentiates between the two phases. Local probing provides insight into the localized and topologically protected nature of the modes. The presented results establish that high-harmonic spectroscopy can be used as an all-optical tool for the detection of Majorana zero modes.
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Affiliation(s)
- Niccolò Baldelli
- Institut
de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science
and Technology, 08860Castelldefels, Barcelona, Spain
| | - Utso Bhattacharya
- Institut
de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science
and Technology, 08860Castelldefels, Barcelona, Spain
| | - Daniel González-Cuadra
- Institut
de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science
and Technology, 08860Castelldefels, Barcelona, Spain
- Institute
for Theoretical Physics, University of Innsbruck, 6020Innsbruck, Austria
- Institute
for Quantum Optics and Quantum Information, Austrian Academy of Sciences, 6020Innsbruck, Austria
| | - Maciej Lewenstein
- Institut
de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science
and Technology, 08860Castelldefels, Barcelona, Spain
- Institución
Catalana de Investigación y Esteudios Avanzados (ICREA), Pg. Lluis Companys 23, 08010Barcelona, Barcelona, Spain
| | - Tobias Graß
- Institut
de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science
and Technology, 08860Castelldefels, Barcelona, Spain
- Donostia
International Physics Center (DIPC), Paseo Manuel de Lardizábal 4, 20018San Sebastián, Gipuzkoa, Spain
- Ikerbasque, Maria Diaz de Haro 3, 48013Bilbao, Biscay, Spain
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Li H, Wang H, Gao W, Chen Z, Han Y, Zhu X, Tian M. Thickness Dependence of Superconductivity in Layered Topological Superconductor β-PdBi 2. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2826. [PMID: 34835590 PMCID: PMC8618462 DOI: 10.3390/nano11112826] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/13/2021] [Accepted: 10/20/2021] [Indexed: 11/16/2022]
Abstract
We report a systematic study on the thickness-dependent superconductivity and transport properties in exfoliated layered topological superconductor β-PdBi2. The superconducting transition temperature Tc is found to decrease with the decreasing thickness. Below a critical thickness of 45 nm, the superconductivity is suppressed, but followed by an abrupt resistance jump near Tc, which is in opposite to the behavior in a superconductor. We attribute suppressed Tc to the enhanced disorder as the thickness decreases. The possible physical mechanisms were discussed for the origination of sharply increased resistance in thinner β-PdBi2 samples.
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Affiliation(s)
- Huijie Li
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China; (H.L.); (H.W.)
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
| | - Huanhuan Wang
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China; (H.L.); (H.W.)
| | - Wenshuai Gao
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China; (H.L.); (H.W.)
| | - Zheng Chen
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
- Department of Physics, University of Science and Technology of China, Hefei 230031, China
| | - Yuyan Han
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
| | - Xiangde Zhu
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
| | - Mingliang Tian
- Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, China; (Z.C.); (Y.H.); (X.Z.); (M.T.)
- School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China
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