Electronic structure and relaxation dynamics in a superconducting topological material

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

doi:10.1038/srep22557

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

Journal Article · Thu Mar 03 00:00:00 EST 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep22557· OSTI ID:1259464

Neupane, Madhab ^[1]; Ishida, Yukiaki ^[2]; Sankar, Raman ^[3]; Zhu, Jian-Xin ^[4]; Sanchez, Daniel S. ^[5]; Belopolski, Ilya ^[5]; Xu, Su-Yang ^[5]; Alidoust, Nasser ^[5]; Hosen, M. Mofazzel ^[6]; Shin, Shik ^[7]; Chou, Fangcheng ^[3]; Hasan, M. Zahid ^[5]; Durakiewicz, Tomasz ^[4]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Central Florida, Orlando, FL (United States)
Univ. of Tokyo (Japan)
National Taiwan Univ., Taipei (Taiwan)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Princeton Univ., NJ (United States)
Univ. of Central Florida, Orlando, FL (United States)
Univ. of Tokyo (Japan); National Taiwan Univ., Taipei (Taiwan)

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 T_c ~ 3 K and a large shielding fraction. Here we report systematic normal state electronic structure studies of Sr_0.06Bi₂Se₃ (T_c ~ 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 Sr_0.06Bi₂Se₃. 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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG-02-05ER46200; AC03-76SF00098; FG02-07ER46352; AC52-06NA25396

OSTI ID:: 1259464

Alternate ID(s):: OSTI ID: 1304826

Report Number(s):: LA-UR-15-25335; srep22557

Journal Information:: Scientific Reports, Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Rotational symmetry breaking in the topological superconductor SrxBi2Se3 probed by upper-critical field experiments Pan, Y.; Nikitin, A. M.; Araizi, G. K. Scientific Reports, Vol. 6, Issue 1 https://doi.org/10.1038/srep28632	journal	June 2016
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Structural distortion behind the nematic superconductivity in Sr _x Bi ₂ Se ₃ Kuntsevich, A. Yu; Bryzgalov, M. A.; Prudkoglyad, V. A. New Journal of Physics, Vol. 20, Issue 10 https://doi.org/10.1088/1367-2630/aae595	journal	October 2018
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