Advances in Condensed Matter Physics / 2015 / Article / Fig 2

Research Article

Collective Modes of an Ultracold 6Li-40K Mixture in an Optical Lattice

Figure 2

The collective-mode dispersion of mixture in 2D optical lattice along the positive and negative directions. The filling factors are and . The interaction strength and the temperature are and , respectively. The secular determinant provides the speed of sound to the positive direction , while the speeds of sound to the negative direction is .

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