Abstract
We consider two parallel layers of two-dimensional spin-polarized dipolar Fermi gas without any tunneling between the layers. The effective interactions describing screening and correlation effects between the dipoles in a single layer (intra-layer) and across the layers (interlayer) are modeled within the Hubbard approximation. We calculate the rate of momentum transfer between the layers when the gas in one layer has a steady flow. The momentum transfer induces a steady flow in the second layer which is assumed initially at rest. This is the drag effect familiar from double-layer semiconductor and graphene structures. Our calculations show that the momentum relaxation time has temperature dependence similar to that in layers with charged particles which we think is related to the contributions from the collective modes of the system.
Highlights
Ultracold gases of polar atoms or molecules with their anisotropic long-range interaction are of great interest in recent years. [1, 2] Single and multi-layer structures of two-dimensional (2D) bosons or fermions are being studied from the point of view of their quantum phases, Fermi liquid properties, collective excitations, and formation of density waves. [3, 4, 5, 6, 8, 9, 10, 11, 12] Ground-state properties of 2D dipolar fermions have been investigated in a number of works [13, 14, 15]
We address a transport property in dipolar fermion gases in analogy to a similar effect observed in electronic systems
In the drag effect when a current is applied to one of the layers the electrons in the second will be dragged resulting in an interlayer resistivity which is related to the momentum transfer between the layers. [18, 19] Interestingly, the newly discovered 2D electronic systems such as graphene exhibit this phenomenon [20]
Summary
Ultracold gases of polar atoms or molecules with their anisotropic long-range interaction are of great interest in recent years. [1, 2] Single and multi-layer structures of two-dimensional (2D) bosons or fermions are being studied from the point of view of their quantum phases, Fermi liquid properties, collective excitations, and formation of density waves. [3, 4, 5, 6, 8, 9, 10, 11, 12] Ground-state properties of 2D dipolar fermions have been investigated in a number of works [13, 14, 15]. [1, 2] Single and multi-layer structures of two-dimensional (2D) bosons or fermions are being studied from the point of view of their quantum phases, Fermi liquid properties, collective excitations, and formation of density waves. We address a transport property in dipolar fermion gases in analogy to a similar effect observed in electronic systems. In electronic bilayer systems a transport phenomenon known as the drag effect has been studied for a long time.
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