Superconductivity in a chiral nanotube

Qin, Feng; Shi, Wu; Ideue, Toshiya; Yoshida, Masaro; Zak, Alla; Tenne, Reshef; Kikitsu, Tomoka; Inoue, Daishi; Hashizume, Daisuke; Iwasa, Yoshihiro

doi:10.1038/ncomms14465

Cited by 177 publications

(162 citation statements)

References 32 publications

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“…In marked contrast,  in the superconducting fluctuation region with I = 0.9 A is largely enhanced as T decreases, becoming 10 6 times larger than that in the normal state. So far, nonreciprocal transport has been reported separately in the normal state (18-23) and superconducting fluctuation region (9)(10)(11)(12) in any materials. The present result is the first simultaneous observation of the nonreciprocal responses, both in the normal and superconducting fluctuation region in an identical sample, clearly demonstrating the gigantic enhancement of  in the superconducting fluctuation region.…”

Section: Resultsmentioning

confidence: 99%

“…As discussed in the previous works (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23), the resistance of the noncentrosymmetric system can be written as R = R (1) (1 + BI) where the first and second terms represent the linear resistance and nonreciprocal magnetoresistance, which is proportional to B and I, respectively.  is a coefficient of nonreciprocal magnetoresistance.…”

Section: Transport Measurementsmentioning

confidence: 99%

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Nonreciprocal transport in gate-induced polar superconductor SrTiO ₃

et al. 2020

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Polar conductors/superconductors with Rashba-type spin-orbit interaction are potential material platforms for quantum transport and spintronic functionalities. One of their inherent properties is the nonreciprocal transport, where the rightward and leftward currents become inequivalent, reflecting spatial inversion/time-reversal symmetry breaking. Such a rectification effect originating from the polar symmetry has been recently observed at interfaces or bulk Rashba semiconductors, while its mechanism in a polar superconductor remains elusive. Here, we report the nonreciprocal transport in gate-induced two-dimensional superconductor SrTiO 3 , which is a Rashba superconductor candidate. In addition to the gigantic enhancement of nonreciprocal signals in the superconducting fluctuation region, we found kink and sharp peak structures around critical temperatures, which reflect the crossover behavior from the paraconductivity origin to the vortex origin, based on a microscopic theory. The present result proves that the nonreciprocal transport is a powerful tool for investigating the interfacial/polar superconductors without inversion symmetry, where rich exotic features are theoretically prognosticated.

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Section: Resultsmentioning

confidence: 99%

Section: Transport Measurementsmentioning

confidence: 99%

Nonreciprocal transport in gate-induced polar superconductor SrTiO ₃

et al. 2020

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“…manifest as the breaking of a 9 particular symmetry for the electrons near the Fermi level. Because the nonlinear transport here combines sensitivity to symmetry as in nonlinear optics and sensitivity to Fermi energy physics as in regular transport, it may be used to probe order parameters of novel broken symmetry states [38,39]. Finally, the responsivity of our WTe 2 device, defined as the ratio between the output nonlinear voltage and the input power ( V NLHE I 2 R ) reaches a large value of 10 4 V/W (see SI.…”

mentioning

confidence: 99%

“…The generalization to gigahertz or terahertz frequencies might be useful for next generation wireless technologies. [38,41,42].…”

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confidence: 99%

Observation of the nonlinear Hall effect under time-reversal-symmetric conditions

Shen

et al. 2018

Nature

475

402

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2The electrical Hall effect is the production of a transverse voltage under an out-of-plane magnetic field [1]. Historically, studies of the Hall effect have led to major breakthroughs including the discoveries of Berry curvature and the topological Chern invariants [2, 3]. In magnets, the internal magnetization allows Hall conductivity in the absence of external magnetic field [3]. This anomalous Hall effect (AHE) has become an important tool to study quantum magnets [3][4][5][6][7][8]. In nonmagnetic materials without external magnetic fields, the electrical Hall effect is rarely explored because of the constraint by time-reversal symmetry.However, strictly speaking, only the Hall effect in the linear response regime, i.e., the Hall voltage linearly proportional to the external electric field, identically vanishes due to time-reversal symmetry [9]. The Hall effect in the nonlinear response regime, on the other hand, may not be subject to such symmetry constraints [10][11][12]. Here, we report the observation of the nonlinear Hall effect (NLHE) [12] in the electrical transport of the nonmagnetic 2D quantum material, bilayer WTe 2 . Specifically, flowing an electrical current in bilayer WTe 2 leads to a nonlinear Hall voltage in the absence of magnetic field. The NLHE exhibits unusual properties sharply distinct from the AHE in metals: The NLHE shows a quadratic I -V characteristic; It strongly dominates the nonlinear longitudinal response, leading to a Hall angle of ∼ 90 • . We further show that the NLHE directly measures the "dipole moment" [12] of the Berry curvature, which arises from layer-polarized Dirac fermions in bilayer WTe 2 . Our results demonstrate a new Hall effect and provide a powerful methodology to detect Berry curvature in a wide range of nonmagnetic quantum materials in an energy-resolved way.In 1879 Edwin H. Hall observed that, when an electrical current passes through a gold film under a magnetic field, a transverse voltage develops [1]. This effect, known as the Hall effect, forms the basis of both fundamental research and practical applications such as magnetic field measurements and motion detectors. In contrast to the classical Hall effect where the Lorentz force bends the trajectory of the charge carriers, quantum mechanics describes the "bending" by the intrinsic geometry of the quantum electron wavefunctions under time-reversal symmetry breaking. This crucial theoretical understanding eventually led to the seminal discoveries of the Berry curvature and the topological Chern number, which have become pillars of modern condensed matter physics [2, 3]. One important cur-3 rent frontier is to identify AHE with quantized or topological character in unconventional magnetic quantum materials, where spin-orbit coupling (SOC), geometrical frustration and electronic correlations coexist [3][4][5][6][7][8]. These extensive studies [1,[3][4][5][6][7][8] have established a paradigm for the electrical Hall effect: (1) A non-vanishing Hall conductivity arises from the momentum-integrated Berry curva...

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“…Individual NT-WS 2 's were also shown to be perfect torsional resonators with the highest quality factor (Q) and torsional resonant frequency in comparison to CNT and BN nanotubes [20]. Recently, the unique nonreciprocal superconductive behavior of individual chiral NT-WS 2 was also reported [21]. Surface modification of NT-WS 2 with inorganic nanoparticles expands application areas of disulfide nanotubes.…”

Section: Introductionmentioning

confidence: 98%

Two facile routes for functionalization of WS2 nanotubes with silver nanoparticles

Polyakov¹,

Лебедев²,

Yadgarov³

et al. 2017

Nanosystems: Phys. Chem. Math.

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Silver-coated WS 2 nanotubes (NT-WS 2 ) were successfully synthesized via two wet chemistry techniques. The first employs spontaneous silver nanoparticle growth resulting from an interaction of disulfide nanotubes with AgNO 3 in aqueous suspensions at 100• C without any additional reducing agents or stabilizers. The second utilizes [Ag(NH 3 ) 2 ]OH complex to produce silver nanoparticles upon thermal decomposition. Both techniques are capable of producing Ag-NT-WS 2 nanocomposites containing 5-60 nm silver nanoparticles tightly attached to the nanotubes' surfaces. The hexagonal arrangement of sulfur atoms of the outer WS 2 layer was postulated to facilitate crystallization of silver nanocrystals with hexagonal crystallographic system (4H-Ag). The physical-chemical model for spontaneous AgNP formation is proposed.

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Superconductivity in a chiral nanotube

Cited by 177 publications

References 32 publications

Nonreciprocal transport in gate-induced polar superconductor SrTiO ₃

Nonreciprocal transport in gate-induced polar superconductor SrTiO ₃

Observation of the nonlinear Hall effect under time-reversal-symmetric conditions

Two facile routes for functionalization of WS2 nanotubes with silver nanoparticles

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Superconductivity in a chiral nanotube

Cited by 177 publications

References 32 publications

Nonreciprocal transport in gate-induced polar superconductor SrTiO 3

Nonreciprocal transport in gate-induced polar superconductor SrTiO 3

Observation of the nonlinear Hall effect under time-reversal-symmetric conditions

Two facile routes for functionalization of WS2 nanotubes with silver nanoparticles

Contact Info

Product

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Nonreciprocal transport in gate-induced polar superconductor SrTiO ₃

Nonreciprocal transport in gate-induced polar superconductor SrTiO ₃