High-flux cold <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Li</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>6</mml:mn> </mml:mmultiscripts> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/M

Integrating two chemically distinct atomic species into a miniaturized, high-flux cold-atom source is a key challenge for modern experiments with ultracold atomic mixtures and polar molecules. Here, we report a compact setup with in-series two-dimensional magneto-optical traps (2D MOTs) that provides high-flux cold lithium and rubidium atoms. Thanks to the efficient short-distance Zeeman slowing, the maximum 3D MOT loading rate of lithium atoms reaches a record value of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mrow> <a:mn>6.6</a:mn> <a:mo>×</a:mo> <a:msup> <a:mn>10</a:mn> <a:mn>9</a:mn> </a:msup> </a:mrow> </a:math> atoms/s at a moderate lithium-oven temperature of 372 degrees Celsius, which is 44 times higher than that without the Zeeman slowing light. The flux of rubidium is also as high as <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"> <b:mrow> <b:mn>2.3</b:mn> <b:mo>×</b:mo> <b:msup> <b:mn>10</b:mn> <b:mn>9</b:mn> </b:msup> </b:mrow> </b:math> atoms/s with the rubidium oven held at room temperature. Meanwhile, the entire vacuum-chamber system, including an ultra-high-vacuum science cell, is within a small volume of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mrow> <c:mn>65</c:mn> <c:mo>×</c:mo> <c:mn>55</c:mn> <c:mo>×</c:mo> <c:mn>70</c:mn> <c:mspace width="4pt"/> <c:msup> <c:mi>cm</c:mi> <c:mn>3</c:mn> </c:msup> </c:mrow> </c:math> . Our work represents a substantial improvement over traditional bulky and complex dual-species cold-atom setups. It provides a good starting point for the fast production of a double-degenerate lithium-rubidium atomic mixture and large samples of ultracold lithium-rubidium ground-state molecules.