Direct observation of vortices in an electron fluid

Aharon-Steinberg, Amit; Völkl, Tobias; Kaplan, Ariel; Roy, Indranil; Holder, Tobias; Wolf, Yotam; Meltzer, Alexander Y.; Myasoedov, Y.; Huber, M. E.; Yan, Binghai; Falkovich, Gregory; Levitov, L. S.; Hücker, M.; Zeldov, E.

doi:10.1038/s41586-022-04794-y

Cited by 70 publications

(54 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Instead, it is necessary to calculate l ee down to low temperatures in order to extract a reliable temperature dependence. In our previous calculation [32], we indeed found that the low temperature limit approaches a T −2 behavior, but such happens only at energies much smaller than the Fermi level, which in WTe 2 is unusually low at E F ≈ 150K. Since the Fermi energy, and the Fermiology of the Fermi surface play a prominent role in WTe 2 [16], and since our previous estimate for ee ≈ 10µm was only 1.5 orders of magnitude to large to explain the hydrodynamic electron flow, here we repeat our calculation for two other band structure candidates for WTe 2 .…”

Section: Electron-electron Collision Rate From the Screened Coulomb I...mentioning

confidence: 93%

“…However, the observation of vortical flow (electron whirlpools) had still remained elusive [28][29][30][31]. This situation was upended very recently when a high-fidelity, spatially-resolved experiment [32] in ultraclean WTe 2 [33,34] could unambiguously demonstrate hydrodynamic vortical flow, clearly excluding a ballistic origin of the observed whirlpool pattern.…”

mentioning

confidence: 99%

“…These conditions were fulfilled in the experiment of Ref. [32], which was done with high-quality samples where /d > 500.…”

mentioning

confidence: 99%

“…Absence of e-e interactions at low T.-It has been argued [16,32] that WTe 2 cannot be in the hydrodynamic regime below 20K. However, estimates for the effective electron-electron mean free path ee may vary considerably depending on the employed band structure model and other details of the calculational approach.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Para-Hydrodynamics from weak surface scattering in ultraclean thin flakes

Wolf¹,

Aharon-Steinberg²,

Yan³

et al. 2022

Preprint

View full text Add to dashboard Cite

Electron hydrodynamics typically emerges in electron fluids with a high electron-electron collision rate. However, new experiments with thin flakes of WTe2 have revealed that other momentumconserving scattering processes can replace the role of the electron-electron interaction, thereby leading to a novel, so-called para-hydrodynamic regime. Here, we develop the kinetic theory for para-hydrodynamic transport. To this end, we consider a ballistic electron gas in a thin 3-dimensional sheet where the momentum-relaxing ( mr ) and momentum-conserving ( mc) mean free paths are decreased due to boundary scattering from a rough surface. The resulting effective mean free path of the electronic flow is then expressed in terms of microscopic parameters of the sheet boundaries, predicting that a para-hydrodynamic regime with mr mc emerges generically in ultraclean three-dimensional materials. Using our approach, we recover the transport properties of WTe2 in the para-hydrodynamic regime in good agreement with existing experiments.

show abstract

Section: Electron-electron Collision Rate From the Screened Coulomb I...mentioning

confidence: 93%

mentioning

confidence: 99%

“…These conditions were fulfilled in the experiment of Ref. [32], which was done with high-quality samples where /d > 500.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Para-Hydrodynamics from weak surface scattering in ultraclean thin flakes

Wolf¹,

Aharon-Steinberg²,

Yan³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…To date, most of these studies focus on the electric properties including the electric potential and the velocity profiles. Most recently, the fast development of the SQUID-on-tip (tSOT) [35][36][37][38][39][40][41][42][43] and the cryogenic quantum magnetometry [24] techniques has enabled another intriguing direction of research-the highresolution detection of the temperature distribution in the hydrodynamic regime.…”

Section: Introductionmentioning

confidence: 99%

Viscous flow through a finite-width slit: Boundary conditions and dissipation

Asafov¹,

Kachorovskii²,

Tikhonov³

et al. 2022

Preprint

View full text Add to dashboard Cite

We study the electronic transport through a finite-size slit in a barrier in a two-dimensional sample in the hydrodynamic regime. We assume a negligible disorder-induced Ohmic resistance, so that dissipation is purely viscosity-induced. We find that the only solution to the Stokes equation in this geometry, which yields a finite dissipation at finite resistance (and, hence, is not self-contradictory), is the one that fulfills both the no-stress and no-slip boundary conditions simultaneously. As a remarkable consequence, the obtained velocity profile satisfies the so-called "partial-slip" (Maxwell) boundary condition for any value of the slip length λ, which drops out from all final results. We also calculate the electronic temperature profile for the small and large heat conductivity, and find asymmetric (with respect to the barrier) temperature patterns in the former case.

show abstract

Experimental Detection of Topological Electronic State and Large Linear Magnetoresistance in SrSn₄ Superconductor

Pariari,

Sharma,

Balal

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

While recent experiments confirm the existence of hundreds of topological electronic materials, only a few exhibit the coexistence of superconductivity (SC) and a topological electronic state. These compounds attract significant attention in forefront research because of the potential for the existence of topological SC, paving the way for future technological advancements. SrSn4 is known for exhibiting unusual SC below the transition temperature (TC) of 4.8 K. Recent theory predicts a topological electronic state in this compound, which is yet to be confirmed by experiments. Systematic and detailed studies of the magnetotransport properties of SrSn4 and its Fermi surface characterizations are also absent. For the first time, a quantum oscillation study reveals a nontrivial 𝝅‐Berry phase, very light effective mass, and high quantum mobility of charge carriers in SrSn4. Magnetotransport experiment unveils large linear transverse magnetoresistance (TMR) of more than 1200% at 5 K and 14 T. Angle‐dependent transport experiments detect anisotropic and fourfold symmetric TMR, with the maximum value (≈2000%) occurring when the angle between the magnetic field and the crystallographic b‐axis is 45°. The results suggest that SrSn4 is the first topological material with SC above the boiling point of helium that displays such high magnetoresistance.

show abstract

Direct observation of vortices in an electron fluid

Cited by 70 publications

References 94 publications

Para-Hydrodynamics from weak surface scattering in ultraclean thin flakes

Para-Hydrodynamics from weak surface scattering in ultraclean thin flakes

Viscous flow through a finite-width slit: Boundary conditions and dissipation

Experimental Detection of Topological Electronic State and Large Linear Magnetoresistance in SrSn₄ Superconductor

Contact Info

Product

Resources

About

Direct observation of vortices in an electron fluid

Cited by 70 publications

References 94 publications

Para-Hydrodynamics from weak surface scattering in ultraclean thin flakes

Para-Hydrodynamics from weak surface scattering in ultraclean thin flakes

Viscous flow through a finite-width slit: Boundary conditions and dissipation

Experimental Detection of Topological Electronic State and Large Linear Magnetoresistance in SrSn4 Superconductor

Contact Info

Product

Resources

About

Experimental Detection of Topological Electronic State and Large Linear Magnetoresistance in SrSn₄ Superconductor