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Iguchi, Ienari; Lee, K.; Kume, E.; Ishibashi, Takayuki; Sato, Kazushige

doi:10.1103/physrevb.61.689

Cited by 23 publications

(15 citation statements)

References 23 publications

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“…1,2 Much effort has been made to stimulate powerful radiations, first using artificial Josephson junction arrays [3][4][5][6][7][8][9][10][11] and later on Josephson junctions inherent in cuprate high-T c superconductors of layered structures. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] The latter have obvious advantages since the junctions are homogeneous at the atomic scale guaranteed by the high quality of single crystals, and the superconductivity gap is large, typically of tens of meV, which in principle permits the frequency to cover the whole range of the terahertz ͑THz͒ band, a very useful regime of EM waves still lacking of compact solid-state generators. 27,28 An experimental breakthrough was achieved in 2007.…”

Section: Introductionmentioning

confidence: 99%

Cavity phenomena in mesas of cuprate high-Tcsuperconductors under voltage bias

Lin

2009

Phys. Rev. B

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Modeling a single crystal of cuprate high-T c superconductor, such as Bi 2 Sr 2 CaCu 2 O 8+␦ , as a stack of intrinsic Josephson junctions, we formulate explicitly the cavity phenomenon of plasma oscillations and electromagnetic ͑EM͒ waves in mesas of cylindrical and annular shapes. The phase differences of the junctions are governed by the inductively coupled sine-Gordon equations, with the Neumann-type boundary condition for sample thickness much smaller than the EM wavelength, which renders the superconductor single crystal a cavity. Biasing a dc voltage in the c direction, a state with Ϯ kinks in the superconductivity phase difference piled up alternatively along the c axis is stabilized. The Ϯ phase kinks provide interlock between superconductivity phases in adjacent junctions, taking the advantage of huge inductive couplings inherent in the cuprate superconductors, which establishes the coherence across the whole system of more than ϳ600 junctions. They also permit a strong coupling between the lateral cavity mode of the transverse Josephson plasma and the c-axis bias, and enhance the plasma oscillation significantly at the cavity modes which radiates EM waves in the terahertz band when the lateral size of mesa is set to tens of micrometers. It is discussed that the cavity mode realized in a very recent experiment using a cylindrical mesa can be explained by the present theory. In order to overcome the heating effect, we propose to use annular geometry. The dependence of frequency on the radius ratio is analyzed, which reveals that the shape tailor is quite promising for improving the present technique of terahertz excitation. The annular geometry may be developed as a waveguide resonator, mimicking the fiber lasers for visible lights.

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Section: Introductionmentioning

confidence: 99%

Cavity phenomena in mesas of cuprate high-Tcsuperconductors under voltage bias

Lin

2009

Phys. Rev. B

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“…1 The Josephson current flowing along the c axis interacts with the electromagnetic field inside the insulating dielectric layers, producing Josephson plasma waves ͑JPWs͒. [1][2][3][4][5][6][7][8][9][10][11][12] In other words, the layered structure of superconductors favors the propagation of electromagnetic waves. A challenge is to excite 13 and to control 14,15 electromagnetic waves in Bi 2 Sr 2 CaCu 2 O 8+␦ ͑BSCCO͒ samples because of their subterahertz and terahertz frequency range, 11,16 which is still hardly reachable for both electronic and optical devices.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear electrodynamics in layered superconductors

et al. 2008

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We analyze theoretically the effect of a weak nonlinearity on the propagation of Josephson plasma waves in layered superconductors. The nonlinearity originates from the Josephson relation between the current density across superconducting layers and gauge-invariant phase difference of the order parameter. We show that strong nonlinear effects can be observed for electromagnetic waves with frequency slightly above or slightly below the plasma frequency. We study the nonlinear plasma resonance accompanied by the hysteretic dependence of the wave amplitude on the frequency. This hysteresis transforms the continuous terahertz radiation into a series of short electromagnetic high-amplitude pulses. We also consider the propagation of a nonlinear terahertz beam localized in the direction across the superconducting layers. This phenomenon is an analog of the self-focusing effect in nonlinear optics. The nonlinear phenomena in layered superconductors considered here can be potentially useful for the design of a new generation of terahertz devices.

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“…It should be noted that the nonlinearity of the coupled sine-Gordon equation is still retained in the equation for P s l , Eq. (24). With this approximation, we can calculate A 1…”

Section: Solutionsmentioning

confidence: 99%

“…[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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Nonequilibrium microwave emission due to tunnel injection of quasiparticles into a high-TcBi2

Cited by 23 publications

References 23 publications

Cavity phenomena in mesas of cuprate high-Tcsuperconductors under voltage bias

Cavity phenomena in mesas of cuprate high-Tcsuperconductors under voltage bias

Nonlinear electrodynamics in layered superconductors

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

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