Odd-frequency superconductivity and Meissner effect in the doped topological insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Johann N. Schmidt, Fariborz Parhizgar, Annica M. Black‐Schaffer
Abstract
Doped ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ is proposed to be a nematic superconductor originating from unusual interorbital pairing. We calculate all induced superconducting pair correlations in ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ and discover that intraorbital odd-frequency pairing clearly dominates over a significant range of frequencies. Moreover, we explore the contributions of even- and odd-frequency pairing to the Meissner effect, including separating intra- and interband processes in the response function. Contrary to expectations, and due to interband contributions, we find a diamagnetic Meissner effect from the odd-frequency pairing that stabilizes the superconducting order.