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Title: Electronic structure and relaxation dynamics in a superconducting topological material

Abstract

Topological superconductors host new states of quantum matter which show a pairing gap in the bulk and gapless surface states providing a platform to realize Majorana fermions. Recently, alkaline-earth metal Sr intercalated Bi2Se3 has been reported to show superconductivity with a Tc ~ 3 K and a large shielding fraction. Here we report systematic normal state electronic structure studies of Sr0.06Bi2Se3 (Tc ~ 2.5 K) by performing photoemission spectroscopy. Using angle-resolved photoemission spectroscopy (ARPES), we observe a quantum well confined two-dimensional (2D) state coexisting with a topological surface state in Sr0.06Bi2Se3. Furthermore, our time-resolved ARPES reveals the relaxation dynamics showing different decay mechanism between the excited topological surface states and the two-dimensional states. Our experimental observation is understood by considering the intra-band scattering for topological surface states and an additional electron phonon scattering for the 2D states, which is responsible for the superconductivity. Our first-principles calculations agree with the more effective scattering and a shorter lifetime of the 2D states. Lastly, our results will be helpful in understanding low temperature superconducting states of these topological materials.

Authors:
 [1];  [2];  [3];  [4];  [5];  [5];  [5];  [5];  [6];  [7];  [3];  [5];  [4]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Central Florida, Orlando, FL (United States)
  2. Univ. of Tokyo (Japan)
  3. National Taiwan Univ., Taipei (Taiwan)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Princeton Univ., NJ (United States)
  6. Univ. of Central Florida, Orlando, FL (United States)
  7. Univ. of Tokyo (Japan); National Taiwan Univ., Taipei (Taiwan)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1259464
Alternate Identifier(s):
OSTI ID: 1304826
Report Number(s):
LA-UR-15-25335
Journal ID: ISSN 2045-2322; srep22557
Grant/Contract Number:  
FG-02-05ER46200; AC03-76SF00098; FG02-07ER46352; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Neupane, Madhab, Ishida, Yukiaki, Sankar, Raman, Zhu, Jian-Xin, Sanchez, Daniel S., Belopolski, Ilya, Xu, Su-Yang, Alidoust, Nasser, Hosen, M. Mofazzel, Shin, Shik, Chou, Fangcheng, Hasan, M. Zahid, and Durakiewicz, Tomasz. Electronic structure and relaxation dynamics in a superconducting topological material. United States: N. p., 2016. Web. doi:10.1038/srep22557.
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Neupane, Madhab, Ishida, Yukiaki, Sankar, Raman, Zhu, Jian-Xin, Sanchez, Daniel S., Belopolski, Ilya, Xu, Su-Yang, Alidoust, Nasser, Hosen, M. Mofazzel, Shin, Shik, Chou, Fangcheng, Hasan, M. Zahid, & Durakiewicz, Tomasz. Electronic structure and relaxation dynamics in a superconducting topological material. United States. https://doi.org/10.1038/srep22557
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Neupane, Madhab, Ishida, Yukiaki, Sankar, Raman, Zhu, Jian-Xin, Sanchez, Daniel S., Belopolski, Ilya, Xu, Su-Yang, Alidoust, Nasser, Hosen, M. Mofazzel, Shin, Shik, Chou, Fangcheng, Hasan, M. Zahid, and Durakiewicz, Tomasz. Thu . "Electronic structure and relaxation dynamics in a superconducting topological material". United States. https://doi.org/10.1038/srep22557. https://www.osti.gov/servlets/purl/1259464.
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@article{osti_1259464,
title = {Electronic structure and relaxation dynamics in a superconducting topological material},
author = {Neupane, Madhab and Ishida, Yukiaki and Sankar, Raman and Zhu, Jian-Xin and Sanchez, Daniel S. and Belopolski, Ilya and Xu, Su-Yang and Alidoust, Nasser and Hosen, M. Mofazzel and Shin, Shik and Chou, Fangcheng and Hasan, M. Zahid and Durakiewicz, Tomasz},
abstractNote = {Topological superconductors host new states of quantum matter which show a pairing gap in the bulk and gapless surface states providing a platform to realize Majorana fermions. Recently, alkaline-earth metal Sr intercalated Bi2Se3 has been reported to show superconductivity with a Tc ~ 3 K and a large shielding fraction. Here we report systematic normal state electronic structure studies of Sr0.06Bi2Se3 (Tc ~ 2.5 K) by performing photoemission spectroscopy. Using angle-resolved photoemission spectroscopy (ARPES), we observe a quantum well confined two-dimensional (2D) state coexisting with a topological surface state in Sr0.06Bi2Se3. Furthermore, our time-resolved ARPES reveals the relaxation dynamics showing different decay mechanism between the excited topological surface states and the two-dimensional states. Our experimental observation is understood by considering the intra-band scattering for topological surface states and an additional electron phonon scattering for the 2D states, which is responsible for the superconductivity. Our first-principles calculations agree with the more effective scattering and a shorter lifetime of the 2D states. Lastly, our results will be helpful in understanding low temperature superconducting states of these topological materials.},
doi = {10.1038/srep22557},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {Thu Mar 03 00:00:00 EST 2016},
month = {Thu Mar 03 00:00:00 EST 2016}
}
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    Works referencing / citing this record:

    Drive the Dirac electrons into Cooper pairs in SrxBi2Se3
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    • Pan, Y.; Nikitin, A. M.; Araizi, G. K.
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    • DOI: 10.1038/srep28632
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