Dark lump excitations in superfluid Fermi gases |
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| Authors: | Xu Yan-Xia and Duan Wen-Shan |
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| Institution: | Xu Yan-Xia and Duan Wen-Shan Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province,College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China |
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| Abstract: | We study the linear and nonlinear properties of two-dimensional matter-wave pulses in disk-shaped superfluid Fermi gases.A Kadomtsev-Petviashvili I(KPI) solitary wave has been realized for superfluid Fermi gases in the limited cases of Bardeen-Cooper-Schrieffer(BCS) regime,Bose-Einstein condensate(BEC) regime,and unitarity regime.Onelump solution as well as one-line soliton solutions for the KPI equation are obtained,and two-line soliton solutions with the same amplitude are also studied in the limited cases.The dependence of the lump propagating velocity and the sound speed of two-dimensional superfluid Fermi gases on the interaction parameter are investigated for the limited cases of BEC and unitarity. |
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| Keywords: | superfluid Fermi gas deep BEC regime unitarity dark lump excitation |
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