Visualizing supercurrents in ferromagnetic Josephson junctions with various arrangements of 0 and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi></mml:math>segments

Gürlich, C.; Scharinger, S.; Weides, Martin; Kohlstedt, H.; Mint︠s︡, R. G.; Goldobin, E.; Koelle, D.; Kleiner, R.

doi:10.1103/physrevb.81.094502

Cited by 32 publications

(18 citation statements)

References 61 publications

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“…which determines the phase discontinuities, Susanto, Goldobin, Koelle, Kleiner and van Gils in [25] have determined the control of fractional vortex crystals without reflection symmetry and study the nonequilibrium transport by using spectral analysis (see also [10] for a numerical approach).…”

Section: Literature Overviewmentioning

confidence: 99%

On periodic waves for sine- and sinh-Gordon equations

Natali

2011

Journal of Mathematical Analysis and Applications

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Results of existence as well as orbital stability/instability of periodic waves associated with sine-Gordon and sinh-Gordon equations will be treated in this manuscript. The sineGordon equation is known to be completely integrable, exactly solvable and it has several special solutions as soliton and breather solutions. We obtain in both cases, a periodic sign-changed wave which is smooth when posed on whole real line. The main tool used is the Grillakis, Shatah and Strauss' theory.

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Section: Literature Overviewmentioning

confidence: 99%

On periodic waves for sine- and sinh-Gordon equations

Natali

2011

Journal of Mathematical Analysis and Applications

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“…16). heat transport and pave the way for the investigation of more exotic junction geometries 18,26,27 . These might provide tunable temperature diffraction patterns and should represent a powerful tool for tailoring and managing heat currents at the nanoscale 8,[29][30][31] .…”

Section: Nature Communications | Doimentioning

confidence: 99%

A quantum diffractor for thermal flux

2014

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Macroscopic phase coherence between weakly coupled superconductors leads to peculiar interference phenomena. Among these, magnetic flux-driven diffraction might be produced, in full analogy to light diffraction through a rectangular slit. This can be experimentally revealed by the electric current and, notably, also by the heat current transmitted through the circuit. The former was observed more than 50 years ago and represented the first experimental evidence of the phase-coherent nature of the Josephson effect, whereas the second one was still lacking. Here we demonstrate the existence of heat diffraction by measuring the modulation of the electronic temperature of a small metallic electrode nearbycontacted to a thermally biased short Josephson junction subjected to an in-plane magnetic field. The observed temperature dependence exhibits symmetry under magnetic flux reversal, and clear resemblance with a Fraunhofer-like modulation pattern. Our approach, joined to widespread methods for phase-biasing superconducting circuits, might represent an effective tool for controlling the thermal flux in nanoscale devices.

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“…Recently, an influence of the local tetragonal domain structure on the conductivity of the 2DEG at the LAO/ STO interface was demonstrated by probing the magnetic field [25] or electric potential [26] induced by the 2DEG, rather than mapping the electronic properties directly, which is difficult with a probe such as scanning tunneling microscopy because the 2DEG is embedded between two insulating oxides. A method that can map the local electric transport properties right at the interface is low-temperature scanning electron microscopy (LTSEM) [27][28][29][30][31], which uses a periodically blanked focused electron beam (e beam) scanned across the sample [29][30][31]. It locally perturbs its electric conductivity with micron-scale spatial resolution and induces a voltage signal ΔV across the sample.…”

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confidence: 99%

Local Electrical Imaging of Tetragonal Domains and Field-Induced Ferroelectric Twin Walls in ConductingSrTiO3

et al. 2016

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We demonstrate electrical mapping of tetragonal domains and electric field-induced twin walls in SrTiO 3 as a function of temperature and gate bias utilizing the conducting LaAlO 3 =SrTiO 3 interface and low-temperature scanning electron microscopy. Conducting twin walls appear below 105 K, and new twin patterns are observed after thermal cycling through the transition or on electric field gating. The nature of the twin walls is confirmed by calculating their intersection angles for different substrate orientations. Numerous walls formed when a large side-or back-gate voltage is applied are identified as field-induced ferroelectric twin walls in the paraelectric tetragonal matrix. The walls persist after switching off the electric field and on thermal cycling below 105 K. These observations point to a new type of ferroelectric functionality in SrTiO 3 , which could be exploited together with magnetism and superconductivity in a multifunctional context. DOI: 10.1103/PhysRevLett.116.257601 The emerging field of domain boundary engineering requires interfaces with unique functionalities [1] such as in the SrTiO 3 (STO)-based heterostructures [2][3][4][5]. STO is cubic at room temperature, but undergoes a ferroelastic transition to tetragonal structure at around 105 K. It does not become spontaneously ferroelectric at low temperatures despite its huge permittivity [6,7]. Nevertheless, electric order can be induced by stress, or by electric field (E) [8][9][10] at a threshold of 1.40 kV=cm at ∼5 K.When STO is used as a substrate or gate insulator for materials such as topological insulators and superconductors [11,12], films grown on STO are assumed to be biased uniformly. However, this is not really the case as nonuniformity can arise from the tetragonal domain structure. Twin boundaries between domains (twin walls) in STO are of particular interest, as they have been suggested to become conducting and ferroelectric at low temperatures [13][14][15][16][17][18][19]. Further, it has been demonstrated that ferroelectric "stripes" can be injected in ferroelectric thin films by increasing the applied voltage [20,21], which requires the material, or at least its domain walls, to be ferroelectric. Here, we image the ferroelastic twin walls in STO, and show that their response above the threshold field is strong evidence that it is the field-induced twin walls that become ferroelectric.STO can be made conducting by doping, by oxygen vacancies, or by electronic reconstruction induced by a polar oxide LaAlO 3 (LAO) that produces a few nanometers of two-dimensional electron gas (2DEG) below the interface [22][23][24], while the bulk of the STO remains insulating. Recently, an influence of the local tetragonal domain structure on the conductivity of the 2DEG at the LAO/ STO interface was demonstrated by probing the magnetic field [25] or electric potential [26] induced by the 2DEG, rather than mapping the electronic properties directly, which is difficult with a probe such as scanning tunneling microscopy because the 2DEG is...

show abstract

Visualizing supercurrents in ferromagnetic Josephson junctions with various arrangements of 0 andπsegments

Cited by 32 publications

References 61 publications

On periodic waves for sine- and sinh-Gordon equations

On periodic waves for sine- and sinh-Gordon equations

A quantum diffractor for thermal flux

Local Electrical Imaging of Tetragonal Domains and Field-Induced Ferroelectric Twin Walls in ConductingSrTiO3

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