Josephson plasma emission from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><

Lee, K.; Wang, W.; Iguchi, Ienari; Tachiki, M.; Hirata, Kazuto; Mochiku, Takashi

doi:10.1103/physrevb.61.3616

Cited by 59 publications

(29 citation statements)

References 22 publications

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“…[13,14,15,16,17,18,19] In spite of these works, it is still lack of clear evidence of coherent radiation. Radiation from BSCCO with injection of quasiparticles has been reported [20,21,22,23,24]. Alternatively, the terahertz radiation without a magnetic field has also been attempted [25,26,27,28,29].…”

Section: Introductionmentioning

confidence: 99%

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Lin

2009

Phys. Rev. B

174

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We present a theoretical description of the phase dynamics and its corresponding electrodynamics in a stack of inductively coupled intrinsic Josephson junctions of layered high-Tc superconductors in the absence of an external magnetic field. Depending on the spatial structure of the gauge invariant phase difference, the dynamic state is classified into: state with kink, state without kink, and state with solitons. It is revealed that in the state with phase kink, the plasma is coupled to the cavity and the plasma oscillation is enhanced. In contrast, in the state without kink, the plasma oscillation is weak. It points a way to enhance the radiation of electromagnetic from high-Tc superconductors. We also perform numerical simulations to check the theory and a good agreement is achieved. The radiation pattern of the state with and without kink is calculated, which may serve as a fingerprint of the dynamic state realized by the system. At last, the power radiation of the state with solitons is calculated by simulations. The possible state realized in the recent experiments is discussed in the viewpoint of the theoretical description. The state with kink is important for applications including terahertz generators and amplifiers.

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Section: Introductionmentioning

confidence: 99%

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Lin

2009

Phys. Rev. B

174

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“…The emission frequencies are inversely proportional to the length of the shorter side of the samples in agreement with experiments. Emission of terahertz electromagnetic (EM) waves from intrinsic Josephson junctions (IJJ) in high temperature superconductors has been extensively studied [1,2,3,4,5,6,7,8]. Recently, Ozyuzer et al succeeded in detecting strong and continuous emission of terahertz EM waves from mesa-shaped samples of the high temperature superconductor Bi 2 Sr 2 CaCu 2 O 8 (BSCCO) [9].…”

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confidence: 99%

Mechanism of Terahertz Electromagnetic Wave Emission from Intrinsic Josephson Junctions

2009

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Using a 3-D parallelepiped model of intrinsic Josephson junctions, we calculate the cavity resonance modes of Josephson plasma waves excited by external electric currents. The electromagnetic (EM) wave of the excited Josephson plasma is converted to a THz EM wave at the sample surfaces. The cavity modes accompanied by static phase kinks of the superconducting order parameter have been intensively investigated. The phase kinks induce a spatial modulation of the amplitude of the order parameter around the kinks and decrease the superconducting condensation energy. The Josephson plasma produces a magnetic field in the vacuum in addition to the emitted EM wave. This magnetic energy detemines the orientation of the cavity mode. Taking account of the facts mentioned above, we obtained sharp resonance peaks in the I-V curves and sizable powers of continuous and coherent terahertz wave emission at the cavity resonance. The emission frequencies are inversely proportional to the length of the shorter side of the samples in agreement with experiments. Emission of terahertz electromagnetic (EM) waves from intrinsic Josephson junctions (IJJ) in high temperature superconductors has been extensively studied [1,2,3,4,5,6,7,8]. Recently, Ozyuzer et al. succeeded in detecting strong and continuous emission of terahertz EM waves from mesa-shaped samples of the high temperature superconductor Bi 2 Sr 2 CaCu 2 O 8 (BSCCO) [9]. The general mechanism for the emission is as follows. When an external current is applied along the c-axis, the ac Josephson current in the resistive state excites a cavity resonance mode of Josephson plasma wave in the sample. The excited standing wave of Josephson plasma is converted to a terahertz EM wave at the mesa surfaces and the EM wave is emitted into the vacuum space. However, details of the mechanism have not yet been clarified, although it is important for designing the terahertz EM wave emitters with use of IJJ.Recently, X. Hu and S. Lin [10,11], and A. Koshelev [12] proposed the following new mechanism. When the inductive interaction between the superconducting CuO 2 layers in BSCCO is strong, static kink structures arise in the phase difference of superconducting order parameter between the superconducting layers. The phase kinks induce cavity resonance modes of the Josephson plasma. This is a new dynamic state caused by the non-linear effect special in the IJJ system. In this paper, we first discuss the stability of this new state, and then we investigate the mechanism of the terahertz EM wave emission on the basis of the discussion.For the sample of IJJ, we use a model shown in Fig. 1. In this figure the superconducting CuO 2 layers and the insulating layers in the IJJ are shown in green and light green, respectively. An external electric current is applied in the direction of the z-axis, perpendicular to the layers. The L x , L y , and L z are the sample lengths respectively along the x, y, and z-axes. Now, we derive the equation for the simulation. The superconducting order parameter of t...

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“…The interlayer tunnelling was also successfully employed for intrinsic tunnelling spectroscopy, which is unique in it's ability to probe bulk phonon [15] and quasiparticle [13,16,17,18,19,20,21] The latter statement together with the assumption of semiconducting T −dependence of the Ohmic resistance leads in the presence of self-heating to non-linear IVC's, which according to Ref. [22] provides both qualitative and quantitative description of all key findings of interlayer transport experiments in HTSC, proves that all the non-linear features of interlayer IVC's are artifacts of selfheating and disproves all findings of intrinsic tunnelling spectroscopy.The incorrectness of the first postulate in the face of overwhelming and unambiguous experimental evidence [5,6,7,8,9,10,11,12,13,14,15] does not require extra comments, except that it demonstrates an obvious failure of the reviewing process in several scientific journals.In this comment I demonstrate incorrectness of the second postulate. It is shown that the genuine interlayer IVC's of Bi-2212 are strongly non-Ohmic and are represented by perfectly periodic, multibranch IVC's, which are not affected by self-heating.…”

mentioning

confidence: 99%

“…The out-of-plane c−axis transport in those compounds is caused by interlayer tunnelling [1], which results in non-metallic behavior [2,3,4] and leads to appearance at T < T c of the "intrinsic" Josephson effect [5] between neighboring CuO 2 planes. At present all major fingerprints of the intrinsic Josephson effect were observed, including Fiske [6,7,8] and Shapiro [7,9] steps in Current-Voltage characteristics (IVC's); the Josephson plasma resonance [10]; thermal activation [11] and macroscopic quantum tunnelling [12] from the Josephson washboard potential; and the flux quantization [6,7,8,13,14]. The latter experiments explicitly confirmed the correspondence between the stacking periodicity of intrinsic Josephson junctions (IJJ's) and the crystallographic unit cell of Bi-2212.…”

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confidence: 99%

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Comment on “Essence of intrinsic tunneling: Distinguishing intrinsic features from artifacts”

Krasnov

2007

Phys. Rev. B

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In a recent paper V.Zavaritsky has argued that interlayer (c− axis) current-voltage characteristics of high temperature superconductors (HTSC) are Ohmic, and has claimed to disprove all findings of intrinsic tunnelling spectroscopy, as well as existence of the interlayer tunnelling and the intrinsic Josephson effect in HTSC, as such.In this comment I demonstrate, that the genuine interlayer current-voltage characteristics are strongly non-Ohmic, which undermines the basic postulate and the logical construction of the criticized paper. [6,7,8,13,14]. The latter experiments explicitly confirmed the correspondence between the stacking periodicity of intrinsic Josephson junctions (IJJ's) and the crystallographic unit cell of Bi-2212. The interlayer tunnelling was also successfully employed for intrinsic tunnelling spectroscopy, which is unique in it's ability to probe bulk phonon [15] and quasiparticle [13,16,17,18,19,20,21] The latter statement together with the assumption of semiconducting T −dependence of the Ohmic resistance leads in the presence of self-heating to non-linear IVC's, which according to Ref. [22] provides both qualitative and quantitative description of all key findings of interlayer transport experiments in HTSC, proves that all the non-linear features of interlayer IVC's are artifacts of selfheating and disproves all findings of intrinsic tunnelling spectroscopy.The incorrectness of the first postulate in the face of overwhelming and unambiguous experimental evidence [5,6,7,8,9,10,11,12,13,14,15] does not require extra comments, except that it demonstrates an obvious failure of the reviewing process in several scientific journals.In this comment I demonstrate incorrectness of the second postulate. It is shown that the genuine interlayer IVC's of Bi-2212 are strongly non-Ohmic and are represented by perfectly periodic, multibranch IVC's, which are not affected by self-heating. The huge, two order of magnitude, genuine non-linearity of IVC's represents the extent of irrelevance of the model advocated by Zavaritsky to the essence of intrinsic tunnelling in HTSC and undermines the logical construction of Ref. [22].Intrinsic tunnelling characteristics of HTSC mesa structures exhibit a characteristic multi-branch structure due to one-by one switching of IJJ's from the superconducting into the resistive state [5]. Each time a new junction is switched into the resistive state the dissipation power within the mesa increases and the effective temperature of the mesa rises as a result of self-heating [24]:where P = V I is the total dissipation power and R th is the effective thermal resistance of the mesa, which depend on the sample geometry and temperature [24,25]. The progressive self-heating with the branch number may result in a systematic distortion of the IVC in the way, shown in Fig. 1. Namely, the critical current and the separation between branches decrease with the branch number. At large P , significant self-heating is indicated by progressive back-bending of the branches. Fig. 1 shows how th...

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Josephson plasma emission fromBi2Sr2CaCu2<

Cited by 59 publications

References 22 publications

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Mechanism of Terahertz Electromagnetic Wave Emission from Intrinsic Josephson Junctions

Comment on “Essence of intrinsic tunneling: Distinguishing intrinsic features from artifacts”

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