Spin-orbit scattering and quantum metallicity in ultrathin Be films

Xiong, Yimin; Karki, Amar B.; Young, David P.; Adams, P. W.

doi:10.1103/physrevb.79.020510

Cited by 10 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Non-dipolar BECs in double-well potentials have allowed for the observation of Josephson oscillations and non-linear self trapping [15], showing clearly that 'slicing' a BEC dramatically enhances the effects of interactions. The two-well Josephson physics is affected quantitatively (although not qualitatively) by the DDI [16,17] (the DDI may induce however significant inter-site effects in coupled 1D and 2D bilayer systems [18][19][20]). On the contrary, as we show below, the DDI does introduce qualitatively novel physics in the Josephson-like dynamics in three-well systems.…”

mentioning

confidence: 99%

Mesoscopic Ensembles of Polar Bosons in Triple-Well Potentials

Lahaye¹,

Pfau²,

Santos³

2010

Phys. Rev. Lett.

View full text Add to dashboard Cite

Mesoscopic dipolar Bose gases in triple-well potentials offer a minimal system for the analysis of the non-local character of the dipolar interaction. We show that this non-local character may be clearly revealed by a variety of possible ground-state phases. In addition, an appropriate control of short-range and dipolar interactions may lead to novel scenarios for the dynamics of polar bosons in lattices, including the dynamical creation of mesoscopic quantum superpositions, which may be employed in the design of Heisenberg-limited atom interferometers.PACS numbers: 03.75. Kk,03.75.Lm Interparticle interactions are crucial in quantum gases [1]. They can usually be described by a short-range isotropic potential proportional to the scattering length a. Recently, dipolar quantum gases, in which the longrange and anisotropic dipole-dipole interaction (DDI) between magnetic or electric dipole moments plays a significant or even dominant role, have attracted a lot of interest as they show fascinating novel properties [2,3]. To date, dipolar effects have been observed experimentally only with atomic magnetic dipoles, being particularly relevant in Bose-Einstein condensates (BECs) of 52 Cr where exciting new physics has been observed [4][5][6][7]. Dipolar effects have also been reported in spinor BECs [8], and in 39 K and 7 Li BECs with a = 0 [9, 10]. Recent experiments with polar molecules [11,12] open fascinating perspectives towards the realization of highly-dipolar gases.Although a very clear and direct demonstration of the anisotropy of the DDI was given by the d-wave collapse of a Cr-BEC [6,7], an equivalently obvious 'visual' proof of the non-local character of the DDI is still missing. Such a non-ambiguous qualitative evidence of the non-local character of the dipolar interaction could be provided in principle by the observation of novel quantum phases (supersolid, checkerboard) in optical lattices [13]. However, the unambiguous detection of such phases is far from trivial, as is the preparation of the ground state of the system due to a large number of metastable states [14].In this Letter, we investigate a minimal system, namely a mesoscopic sample of dipolar bosons in a triple-well potential, which minimizes these restrictions, while still presenting clear visual non-local features (see "phase" B below). Non-dipolar BECs in double-well potentials have allowed for the observation of Josephson oscillations and non-linear self trapping [15], showing clearly that 'slicing' a BEC dramatically enhances the effects of interactions. The two-well Josephson physics is affected quantitatively (although not qualitatively) by the DDI [16,17] (the DDI may induce however significant inter-site effects in coupled 1D and 2D bilayer systems [18][19][20]). On the contrary, as we show below, the DDI does introduce qualitatively novel physics in the Josephson-like dynamics in three-well systems. We discuss how the DDI leads to various possible ground states, which may visually reveal the non-locality of the DDI. In addition, w...

show abstract

mentioning

confidence: 99%

Mesoscopic Ensembles of Polar Bosons in Triple-Well Potentials

Lahaye¹,

Pfau²,

Santos³

2010

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…(22) and (25), we observe that the numerator of χ αα r is proportional to the square of the second derivative of GS energy and the denominator is finite in unpolarized state. The second power in the numerator indicates that the two-site RFS is more effective than the second derivative of the GS energy in measuring QPTs [76]. We compare the RFS of two NN sites with the second derivative of GS energy of N = 18 square lattice (see Fig.…”

Section: Reduced Fidelity Susceptibility In the 2d Compass Modelmentioning

confidence: 99%

Fidelity susceptibility in two-dimensional spin-orbit models

You

Dong

2011

Phys. Rev. B

View full text Add to dashboard Cite

We study the quantum phase transitions in the two-dimensional spin-orbit models in terms of fidelity susceptibility and reduced fidelity susceptibility. An order-to-order phase transition is identified by fidelity susceptibility in the two-dimensional Heisenberg XXZ model with Dzyaloshinsky-Moriya interaction on a square lattice. The finite size scaling of fidelity susceptibility shows a power-law divergence at criticality, which indicates the quantum phase transition is of second order. Two distinct types of quantum phase transitions are witnessed by fidelity susceptibility in Kitaev-Heisenberg model on a hexagonal lattice. We exploit the symmetry of two-dimensional quantum compass model, and obtain a simple analytic expression of reduced fidelity susceptibility. Compared with the derivative of ground-state energy, the fidelity susceptibility is a bit more sensitive to phase transition. The violation of power-law behavior for the scaling of reduced fidelity susceptibility at criticality suggests that the quantum phase transition belongs to a first-order transition. We conclude that fidelity susceptibility and reduced fidelity susceptibility show great advantage to characterize diverse quantum phase transitions in spin-orbit models.

show abstract

“…[7−9] More recently, much attention has been paid to exploration of the effects of the anisotropic character of the DDI by employing a simple model. [10,11] It is known that the stability of Bloch states in optical lattices is directly responsible for the breakdown of the superfluidity of the system. Bloch states can be unstable, that is, the system diverges away from the original Bloch state upon small perturbation.…”

mentioning

confidence: 99%