A Sawtooth Permanent Magnetic Lattice for Ultracold Atoms and BECs

TL;DR

This paper introduces a novel permanent magnetic lattice design using sawtooth patterns on magnetic films to create microtraps for ultracold atoms and BECs, emphasizing ease of fabrication and tunable trap parameters.

Contribution

It proposes a new sawtooth magnetic lattice structure for ultracold atom trapping, with analytical and numerical analysis demonstrating its advantages over previous designs.

Findings

Lattice can be fabricated on thin magnetic films like TbGdFeCo.

Trap depth and frequencies are tunable via bias fields.

Design avoids Majorana spin flips due to non-zero potential minima.

Abstract

We propose a new permanent magnetic lattice for creating periodic arrays of Ioffe-Pritchard permanent magnetic microtraps for holding and controlling ultracold atoms and Bose-Einstein condensates (BECs). Lattice can be designed on thin layer of magnetic films such as $Tb_6$$Gd_10$$Fe_{80}$$Co_4$. In details, we investigate single layer and two crossed layers of sawtooth magnetic patterns with thicknesses of 50 and 500nm respectively with a periodicity of 1$\mu$m. Trap depth and frequencies can be changed via an applied bias field to handle tunneling rates between lattice sites. We present analytical expressions and using numerical calculations show that this lattice has non-zero potential minima to avoid majorana spin flips. One advantage of this lattice over previous ones is that it is easier to manufacture.