Hot Spots and Waves in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CaCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:math>Intrinsic Josephson Junction Stacks: A Study by Low Temperature Scanning Laser Microscopy

Wang, H. B.; Guénon, Stefan; Yuan, Jie; Iishi, A.; Arisawa, Shunichi; Hatano, Takeshi; Yamashita, Tsutomu; Koelle, D.; Kleiner, R.

doi:10.1103/physrevlett.102.017006

Cited by 179 publications

(225 citation statements)

References 34 publications

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“…The appearance of such hot spots whose positions are asymmetric with respect to the center of the mesas have been already reported in previous experimental studies. [20][21][22] …”

Section: Calculation Methodsmentioning

confidence: 99%

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Three-dimensional numerical analysis of terahertz radiation emitted from intrinsic Josephson junctions with hot spots

2012

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In this study, we numerically investigate the terahertz radiation from mesa-structured intrinsic Josephson junctions (IJJs) using a three-dimensional calculation model. We assume an in-phase mode of the phase differences and calculate electromagnetic fields inside and outside of the IJJs simultaneously. We consider the appearance of a hot spot in the mesa where j c locally decreases and investigate the change of the radiation power with varying hot-spot positions. The radiation powers for three different hot-spot positions are calculated as functions of voltage. We observe strong radiation when the ac Josephson frequency satisfies the cavity resonance condition. Transverse-magnetic modes TM m,n whose indices m and n are even appear regardless of the positions of hot spots. Meanwhile, the TM m,n cavity modes whose m or n are odd appear only when the hot spots break the reflectional symmetry of the mesa structure. Moreover, we calculate the radiation patterns emitted by the IJJs at these cavity resonance conditions. The radiation patterns reflect the existence of two types of internal modes, that is, a uniform background mode and a cavity resonance mode.

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“…The appearance of such hot spots whose positions are asymmetric with respect to the center of the mesas have been already reported in previous experimental studies. [20][21][22] …”

Section: Calculation Methodsmentioning

confidence: 99%

“…Moreover, the radiation patterns emitted by inhomogeneous samples have not been investigated in previous studies. Recently, Wang et al have reported the appearance of hot spots where the temperature is locally high, [20][21][22] and these inhomogeneities are considered to affect the emission from the IJJs.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional numerical analysis of terahertz radiation emitted from intrinsic Josephson junctions with hot spots

2012

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“…As can be seen in the plot, the IV-characteristics are strongly influenced by self-heating, to the extent that it is S-shaped, which is typical for mesas of this size [12,15]. For the mesas on this chip, THz emission occurs where dI/dV is very large, or even negative, and it has been suggested [16] that this may be essential for some modes of THz emission in these devices. The jumps in the IV-curves around 40 mA may be a signature of the formation of hot-spots in the mesas [16].…”

mentioning

confidence: 89%

“…For the mesas on this chip, THz emission occurs where dI/dV is very large, or even negative, and it has been suggested [16] that this may be essential for some modes of THz emission in these devices. The jumps in the IV-curves around 40 mA may be a signature of the formation of hot-spots in the mesas [16]. The over-all features of the IV-curves of different mesas are very similar; however, details vary which will affect their synchronization.…”

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confidence: 99%

Powerful terahertz emission from Bi2Sr2CaCu2O8+δ mesa arrays

Benseman¹,

Koshelev²,

Kwok³

et al. 2013

Applied Physics Letters

122

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Stacks of intrinsic Josephson junctions (IJJs) in high-temperature superconductors enable the fabrication of compact sources of coherent terahertz radiation. Here we demonstrate that multiple stacks patterned on the same Bi 2 Sr 2 CaCu 2 O 8+ crystal can -under optimized conditions -be synchronized to emit high-power THz-radiation. For three synchronized stacks we achieved 610 microwatts of continuous-wave coherent radiation power at 0.51 THz. We suggest that synchronization is promoted by THz-waves in the base crystal.We note though that synchronization cannot be achieved in all samples. However, even in these cases powers on the 100-µW scale can be generated.

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“…While Shapiro-steps have remained a tool in exploring new directions in Josephson physics, for instance in atomic point contacts [2][3][4][5][6] , other nonlinear phenomena, like synchronization, have been investigated in arrays of JJs: as a test-bed for generic theory models to capture synchronization phenomena 7,8 , but as importantly with the prospect of applications as sources of more intense coherent radiation 9 , cf. also new developments using intrinsic arrays [10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Resonators coupled to voltage-biased Josephson junctions: From linear response to strongly driven nonlinear oscillations

et al. 2015

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Motivated by recent experiments, where a voltage biased Josephson junction is placed in series with a resonator, the classical dynamics of the circuit is studied in various domains of parameter space. This problem can be mapped onto the dissipative motion of a single degree of freedom in a nonlinear time-dependent potential, where in contrast to conventional settings the nonlinearity appears in the driving while the static potential is purely harmonic. For long times the system approaches steady states which are analyzed in the underdamped regime over the full range of driving parameters including the fundamental resonance as well as higher and sub-harmonics. Observables such as the dc-Josephson current and the radiated microwave power give direct information about the underlying dynamics covering phenomena as bifurcations, irregular motion, up-and down conversion. Due to their tunability, present and future set-ups provide versatile platforms to explore the changeover from linear response to strongly nonlinear behavior in driven dissipative systems under well defined conditions. I. INTRODUCTIONThe nonlinear properties of Josephson junctions (JJs) have made such devices a key circuit element for classical and quantum electronics. Accordingly, there has been a long tradition of studying non-linear phenomena in driven superconducting circuits, starting as early as the 1960s with the discovery of Shapiro steps 1 . While Shapiro-steps have remained a tool in exploring new directions in Josephson physics, for instance in atomic point contacts 2-6 , other nonlinear phenomena, like synchronization, have been investigated in arrays of JJs: as a test-bed for generic theory models to capture synchronization phenomena 7,8 , but as importantly with the prospect of applications as sources of more intense coherent radiation 9 , cf. also new developments using intrinsic arrays 10-12 .More recently, the nonlinearity of the JJ was exploited as the crucial factor in enabling the high sensitivity of Josephson bifurcation amplifiers, achieving substantial improvements towards reaching quantum-limited measurement processes [13][14][15][16] . Most of the features of Josephson bifurcation amplifiers, in fact, only rely on (and can consequently be described by) any type of nonlinearity 17-22 , e.g., Duffing-type models, so that only recently the full nonlinear potential of the JJ has become of interest in this field 23 .A recent addition to the field of driven nonlinear JJs 24-26 are experiments on a dc-biased JJ connected to a resonator 27-29 . In this sort of setup, charge transfer through the JJ leads to excitations in the resonator, and therefore allows to convert energy carried by charge quanta into quantum microwave photons. In these devices measurement of both the Josephson current and the emitted microwave radiation is possible, a distinct advantage in comparison to other recently proposed transport setups 30,31 , which show similar nonlinear features like bifurcations, period multiplication and up-and downconversion 32-34 . S...

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Hot Spots and Waves inBi2Sr2CaCu2O8Intrinsic Josephson Junction Stacks: A Study by Low Temperature Scanning Laser Microscopy

Cited by 179 publications

References 34 publications

Three-dimensional numerical analysis of terahertz radiation emitted from intrinsic Josephson junctions with hot spots

Three-dimensional numerical analysis of terahertz radiation emitted from intrinsic Josephson junctions with hot spots

Powerful terahertz emission from Bi2Sr2CaCu2O8+δ mesa arrays

Resonators coupled to voltage-biased Josephson junctions: From linear response to strongly driven nonlinear oscillations

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