“Long-term consolidation behavior interpreted with isotache concept for worldwide clays” by Watabe, Y., Udaka, K., Nakatani, Y., Leroueil, S. [Soils and Foundations 52 (3) (2012) 449–464]

Watabe, Yoichi; Udaka, Kaoru; Nakatani, Yukio; Leroueil, Serge

doi:10.1016/j.sandf.2013.01.003

Cited by 12 publications

(10 citation statements)

References 2 publications

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“…However, in the critical current state, the tunneling property is qualitatively changed by the interaction parameter. These findings will be reported in a separate paper [28].…”

Section: -8mentioning

confidence: 59%

“…It is an interesting problem to extend our present work to the polar phase, which is the other phase of the spin-1 BEC. We have examined the same problem for the spin-wave modes in the current-carrying state of the polar phase [28]. We found that the anomalous tunneling phenomenon of the spin-wave modes occurs unless the system is in the critical current state.…”

Section: -8mentioning

confidence: 99%

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Tunneling properties of Bogoliubov mode and spin-wave modes in supercurrent states of a spin-1 ferromagnetic spinor Bose-Einstein condensate

2011

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We investigate the tunneling properties of collective excitations in the ferromagnetic phase of a spin-1 spinor Bose-Einstein condensate (BEC). In addition to the Bogoliubov mode, this superfluid phase has two spin excitations, namely, the gapless transverse spin wave and the quadrupolar mode with a finite excitation gap. In the mean-field theory at T = 0, we examine how these collective modes tunnel through a barrier potential that couples to the local density of particles. In the presence of supercurrent with a finite momentum q, while the Bogoliubov mode shows the so-called anomalous tunneling behavior (which is characterized by perfect transmission) in the low-energy limit, the transverse spin wave transmits perfectly only when the momentum k of this mode coincides with ±q. At k = ±q, the wave function of this spin wave has the same form as the condensate wave function in the current-carrying state, so that the mechanism of this perfect transmission is found to be the same as tunneling of the supercurrent. Using this fact, the perfect transmission of the spin wave is proved for a generic barrier potential. We show that such perfect transmission does not occur in the quadrupolar mode. Further, we consider the effects of potentials breaking U(1) and spin-rotation symmetries on the transmission properties of excitations. Our results would be useful for understanding excitation properties of spinor BEC's, as well as the anomalous tunneling phenomenon in Bose superfluids.

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“…However, in the critical current state, the tunneling property is qualitatively changed by the interaction parameter. These findings will be reported in a separate paper [28].…”

Section: -8mentioning

confidence: 59%

Section: -8mentioning

confidence: 99%

Tunneling properties of Bogoliubov mode and spin-wave modes in supercurrent states of a spin-1 ferromagnetic spinor Bose-Einstein condensate

2011

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“…(61), when taking the γ → 0 + limit. Since this amplitude-phase coupling is associated with the violation of number conservation [60] due to the tunneling of particles between the system and the reservoirs, it works as a damping of fluctuations. This helps the condensate to stabilize, making it possible to have regimes with both α 11 and β 22 negative for finite γ.…”

Section: Equation (70) Can Be Depicted Diagramatically As Inmentioning

confidence: 99%

Dynamical instability of a driven-dissipative electron-hole condensate in the BCS-BEC crossover region

2017

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We present a stability analysis on a driven-dissipative electron-hole condensate in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein-condensation)-crossover region. Extending the combined BCS-Leggett theory with the generalized random phase approximation (GRPA) to the non-equilibrium case by employing the Keldysh formalism, we show that the pumping-and-decay of carriers causes a depairing effect on excitons. This phenomenon gives rise to an attractive interaction between excitons in the BEC regime, as well as a supercurrent that anomalously flows anti-parallel to ∇θ(r) (where θ(r) is the phase of the condensate) in the BCS regime, both leading to dynamical instabilities of an exciton-BEC. Our result suggests that substantial region of the exciton-BEC phase in the phase diagram (in terms of the interaction strength and the decay rate) is unstable. arXiv:1610.08622v3 [cond-mat.str-el]

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“…Hence, in order to understand the emergence of two different critical speeds for vortex dipole shedding in antiferromagnetic and cyclic phases of spinor condensate, we calculate the excitation spectrum of the uniform binary system, introduced in the previous section, representing the spinor BEC. It must be stated that there are a few spin-wave excitations which are not captured by the analysis based on the binary system, but they do not play any role in the vortex shedding dynamics considered in this paper and are decoupled from the modes captured by binary system approach [36]. If δφ j are the changes in the wavefunctions from their respective unperturbed values, one can derive the Bogoliubovde Gennes (BdG) equations for the uniform binary condensate (V = 0) by linearizing Eqs.…”

Section: Critical Speeds For the Binary Systemmentioning

confidence: 98%

Fractional-charge vortex in a spinor Bose-Einstein condensate

Gautam

Adhikari

2016

Phys. Rev. A

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We classify all possible fractional charge vortices of charge less than unity in spin-1 and spin-2 polar and cyclic Bose-Einstein condensates (BECs) with zero magnetization. Statics and dynamics of these vortices in quasi-two-dimensional spinor BECs are studied employing accurate numerical solution and a Lagrange variational approximation. The results for density and collective-mode oscillation are illustrated using fractional-charge BEC vortex of 23 Na and 87 Rb atoms with realistic interaction and trapping potential parameters.

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“Long-term consolidation behavior interpreted with isotache concept for worldwide clays” by Watabe, Y., Udaka, K., Nakatani, Y., Leroueil, S. [Soils and Foundations 52 (3) (2012) 449–464]

Cited by 12 publications

References 2 publications

Tunneling properties of Bogoliubov mode and spin-wave modes in supercurrent states of a spin-1 ferromagnetic spinor Bose-Einstein condensate

Tunneling properties of Bogoliubov mode and spin-wave modes in supercurrent states of a spin-1 ferromagnetic spinor Bose-Einstein condensate

Dynamical instability of a driven-dissipative electron-hole condensate in the BCS-BEC crossover region

Fractional-charge vortex in a spinor Bose-Einstein condensate

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