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Katterwe, Sven Olof; Krasnov, Vladimir M.

doi:10.1103/physrevb.84.214519

Cited by 18 publications

(16 citation statements)

References 49 publications

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“…Vertical bars on top of Fig. 3c, f mark expected frequencies of strongly emitting in-phase geometrical resonances in a rectangular mesa with sizes L x × L y corresponding to those generators,Here is the speed of in-phase electromagnetic waves, deduced from analysis of Fiske steps in similar small Bi-2212 mesas 25 ( c - is the speed of light in vacuum). It is seen that the emission peaks correspond to certain cavity modes, indicated in brackets.…”

Section: Resultsmentioning

confidence: 99%

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Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Borodianskyi

Krasnov

2017

Nat Commun

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Mesa structures made of Bi2Sr2CaCu2O8+δ high-temperature superconductor represent stacks of atomic scale intrinsic Josephson junctions. They can be used for generation of high-frequency electromagnetic waves. Here we analyze Josephson emission from small-but-high mesas (with a small area, but containing many stacked junctions). We have found strong evidence for tunable terahertz emission with a good efficacy in a record high-frequency span 1–11 THz, approaching the theoretical upper limit for this superconductor. Emission maxima correspond to in-phase cavity modes in the mesas, indicating coherent superradiant nature of the emission. We conclude that terahertz emission requires a threshold number of junctions N ~ 100. The threshold behavior is not present in the classical description of stacked Josephson junctions and suggests importance of laser-like cascade amplification of the photon number in the cavity.

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Section: Resultsmentioning

confidence: 99%

“…Fiske steps with Q > 100 were reported for μm-size Bi-2212 mesas 25 . This should strongly boost the emission efficiency because high- Q resonances enhance the emission power ∝ Q 2 and decrease the line-width ∝1/ Q 26,27 .…”

Section: Introductionmentioning

confidence: 99%

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Borodianskyi

Krasnov

2017

Nat Commun

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“…If ∆f of the high-bias THz emission signal were set by a cavity resonance, its quality factor Q = f /∆f would have to amount some 10 4 , which is more than unrealistic for an IJJ stack [28,38,43]. At least for small mesas, cavity resonances become overdamped for T > 60 K [43]. For T ∼ 40 K we expect Q << 50.…”

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confidence: 99%

“…Recent 3D simulations [39] based on the sine-Gordon equation and taking a hotspot into account yielded an asymmetric Fano shape in contrast to our experimental data. If ∆f of the high-bias THz emission signal were set by a cavity resonance, its quality factor Q = f /∆f would have to amount some 10 4 , which is more than unrealistic for an IJJ stack [28,38,43]. At least for small mesas, cavity resonances become overdamped for T > 60 K [43].…”

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confidence: 99%

Linewidth dependence of coherent terahertz emission from Bi2Sr2CaCu2O
Li
¹
,
Yuan
²
,
Kinev
³

et al. 2012
Phys. Rev. B

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We report on measurements of the linewidth ∆f of THz radiation emitted from intrinsic Josephson junction stacks, using a Nb/AlN/NbN integrated receiver for detection. Previous resolution limited measurements indicated that ∆f may be below 1 GHz -much smaller than expected from a purely cavity-induced synchronization. While at low bias we found ∆f to be not smaller than ∼ 500 MHz, at high bias, where a hotspot coexists with regions which are still superconducting, ∆f turned out to be as narrow as 23 MHz. We attribute this to the hotspot acting as a synchronizing element. ∆f decreases with increasing bath temperature, a behavior reminiscent of motional narrowing in NMR or ESR, but hard to explain in standard electrodynamic models of Josephson junctions.

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“…# " % $& of -wave pair potential. However, ' ) ( -based cuprate ' ) (0010 is found to be a candidate for anisotropic spin-singlet -wave superconducting gap [15,16,17,18,19]. Very recently, the coexistence of proximity-induced a conventional superconducting pair potential and a ferromagnetic order at the same time in the surface of 3DTI has been theoretically investigated [20,21,22].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric d -wave superconducting topological insulator in proximity with a magnetic order

2018

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In the framework of the Dirac-Bogoliubov-de Gennes formalism, we investigate the transport properties in the surface of a 3-dimensional topological insulator-based hybrid structure, where the ferromagnetic and superconducting orders are simultaneously induced to the surface states via the proximity effect. The superconductor gap is taken to be spin-singlet ¦ -wave symmetry. The asymmetric role of this gap respect to the electron-hole exchange, in one hand, affects the topological insulator superconducting binding excitations and, on the other hand, gives rise to forming distinct Majorana bound states at the ferromagnet/superconductor interface. We propose a topological insulator N/F/FS junction and proceed to clarify the role of ¦ -wave asymmetry pairing in the resulting subgap and overgap tunneling conductance. The perpendicular component of magnetizations in F and FS regions can be at the parallel and antiparallel configurations leading to capture the experimentally important magnetoresistance (MR) of junction. It is found that the zero-bias conductance is strongly sensitive to the magnitude of magnetization in FS region § © and orbital rotated angle of superconductor gap. The negative MR only occurs in zero orbital rotated angle. This result can pave the way to distinguish the unconventional superconducting state in the relating topological insulator hybrid structures.

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Temperature dependences of geometrical and velocity-matching resonances in Bi2Sr2CaCu2O

Cited by 18 publications

References 49 publications

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Linewidth dependence of coherent terahertz emission from Bi2Sr2CaCu2O
Li
¹
,
Yuan
²
,
Kinev
³

et al. 2012
Phys. Rev. B

Asymmetric d -wave superconducting topological insulator in proximity with a magnetic order

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Temperature dependences of geometrical and velocity-matching resonances in Bi2Sr2CaCu2O

Cited by 18 publications

References 49 publications

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

Linewidth dependence of coherent terahertz emission from Bi2Sr2CaCu2OLi1, Yuan2, Kinev3 et al. 2012Phys. Rev. B

Asymmetric d -wave superconducting topological insulator in proximity with a magnetic order

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About

Linewidth dependence of coherent terahertz emission from Bi2Sr2CaCu2O
Li
¹
,
Yuan
²
,
Kinev
³

et al. 2012
Phys. Rev. B