Reflectivity in the presence of the oscillation for ω = 0.5 ω<sub>in</sub>

<p><strong>Figure 4.</strong> Reflectivity in the presence of the oscillation for ω = 0.5 ω<sub>in</sub>. The reflectivity for the central peak <em>R</em><sub>0</sub> and the two side peaks <em>R</em><sub>−1</sub> and <em>R</em><sub>1</sub> is shown, together with the reflectivity for the non-oscillating surface for comparison (dashed line). To calculate the <em>R</em><sub>−1</sub>, <em>R</em><sub>0</sub> and <em>R</em><sub>1</sub>, 60 calculations between two subsequent maxima in the reflectivity as a function of <em>x</em><sub>0</sub> were carried out in the range 3.7 <b>×</b> 10<sup>−10</sup> m < <em>x</em><sub>0</sub> < 7.3 <b>×</b> 10<sup>−10</sup> m for each velocity. Inset: reflectivity for the non-oscillating surface (dashed line) and total reflectivity <em>R</em><sub>tot</sub> for the oscillating surface (filled circles).</p> <p><strong>Abstract</strong></p> <p>We describe an experimentally realistic situation of the quantum reflection of helium atoms from an oscillating surface. The temporal modulation of the potential induces clear sidebands in the reflection probability as a function of momentum. These sidebands could be exploited to slow down atoms and molecules in the experiment.</p>