Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B22: Superconductivity: Theory-I
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 214
Sponsoring
Unit:
DCMP
Chair: Andrey Chubukov, University of Minnesota
Abstract: B22.00005 : Manipulating Andreev bound states in bilayer graphene Josephson junction*
12:18 PM–12:30 PM
Presenter:
Geon-Hyoung Park
(Pohang Univ of Sci & Tech)
Authors:
Geon-Hyoung Park
(Pohang Univ of Sci & Tech)
Sein Park
(Pohang Univ of Sci & Tech)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(National Institute for Materials Science)
Gil-Ho Lee
(Pohang Univ of Sci & Tech)
mso-fareast-font-family:"MS Mincho";mso-bidi-font-family:"Times New Roman";
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JA;mso-bidi-language:AR-SA'>« 1, short Josephson junction) to two or more pairs (L/ξs <!--[if gte msEquation 12]> lang=EN-US style='font-size:11.0pt;mso-bidi-font-size:10.0pt;font-family:"Cambria Math",serif;
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JA;mso-bidi-language:AR-SA'>» 1, long Josephson junction). Many efforts have been made to probe the spectrum of ABSs in short Josephson junction, however, there are very few experimental reports on ABSs in long Josephson junction so far. Here, we present the experimental observation of crossover from short to long Josephson coupling by tunneling spectroscopy. The tunnel probe is made of one-dimensional contact of Al superconducting electrode on one side of high-quality bilayer graphene (BLG) encapsulated with thin hexagonal boron nitride crystals. The sharp density of states of superconducting tunneling probe enables high spectral resolution in tunneling spectroscopy. Also, crossover from short to long Josephson junction can be achieved by modulating the charge carrier density of BLG without varying physical channel length. The result reveals that additional ABS modes appear gradually when the Fermi level approaches close enough to the charge neutral point of bilayer graphene, which implies transition of ABSs from short to long regime. Furthermore, replica of ABS resonance appears even above the superconducting gap at high carrier density regime. This work will give not only new degree of freedom to manipulate ABS mode numbers but also better understanding of underlying physics of long Josephson junction.
*Samsung Science and Technology Foundation (project number SSTF-BA1702-05), National Research Foundation of Korea (NRF) funded by the Korean Government (grant numbers 2016R1A5A1008184, 2020R1C1C1013241 and 2020M3H3A1100839)
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