Gate-tunable giant superconducting nonreciprocal transport in few-layer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>d</mml:mi></mml:msub><mml:mtext>−</mml:mtext><mml:msub><mml:mi>MoTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Abstract

We demonstrate gate-tunable giant field-dependent nonreciprocal transport (magnetochiral anisotropy) in a noncentrosymmetric superconductor <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>T</a:mi><a:mi mathvariant="normal">d</a:mi></a:msub><a:mtext>−</a:mtext><a:msub><a:mi>MoTe</a:mi><a:mn>2</a:mn></a:msub></a:mrow></a:math> in the thin limit. Giant magnetochiral anisotropy (MCA) with a rectification coefficient (or a figure of merit) <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:mi>γ</c:mi><c:mo>=</c:mo><c:mn>3.1</c:mn><c:mo>×</c:mo><c:msup><c:mn>10</c:mn><c:mn>6</c:mn></c:msup><c:mspace width="4pt"/><c:msup><c:mrow><c:mi mathvariant="normal">T</c:mi></c:mrow><c:mrow><c:mo>−</c:mo><c:mn>1</c:mn></c:mrow></c:msup><c:mspace width="4pt"/><c:msup><c:mrow><c:mi mathvariant="normal">A</c:mi></c:mrow><c:mrow><c:mo>−</c:mo><c:mn>1</c:mn></c:mrow></c:msup></c:mrow></c:math> is observed at 230 mK, below the superconducting transition temperature <h:math xmlns:h="http://www.w3.org/1998/Math/MathML"><h:mo>(</h:mo><h:msub><h:mi>T</h:mi><h:mi>c</h:mi></h:msub><h:mo>)</h:mo></h:math>. This is one of the largest values reported so far and may be attributed to the reduced symmetry of the crystal structure. The temperature dependence of <i:math xmlns:i="http://www.w3.org/1998/Math/MathML"><i:mi>γ</i:mi></i:math> indicates that ratchetlike motion of magnetic vortices is the origin of the MCA, as supported by our theoretical model. For bilayer (2 L) <j:math xmlns:j="http://www.w3.org/1998/Math/MathML"><j:mrow><j:msub><j:mi>T</j:mi><j:mi mathvariant="normal">d</j:mi></j:msub><j:mtext>−</j:mtext><j:msub><j:mi>MoTe</j:mi><j:mn>2</j:mn></j:msub></j:mrow></j:math>, we can successfully modulate <l:math xmlns:l="http://www.w3.org/1998/Math/MathML"><l:mi>γ</l:mi></l:math> by gating. Our experimental results provide a new route to realizing electrically controllable superconducting rectification devices in a single material. Published by the American Physical Society 2024

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