Thermal Management in Large Bi2212 Mesas Used for Terahertz Sources
Thermal Management in Large Bi2212 Mesas Used for Terahertz Sources
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DOI：
10.1109/tasc.2009.2019235
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发表时间：
2009-01
影响因子：
1.8
通讯作者：
C. Kurter;K. Gray;J. Zasadzinski;L. Ozyuzer;A. Koshelev;Qing’an Li;T. Yamamoto;K. Kadowaki;W. Kwok;M. Tachiki;U. Welp
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文献类型：
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作者：
C. Kurter;K. Gray;J. Zasadzinski;L. Ozyuzer;A. Koshelev;Qing’an Li;T. Yamamoto;K. Kadowaki;W. Kwok;M. Tachiki;U. Welp
我们提出了一个图案化的梅萨上的Bi 2Sr 2CaCu 2 O 8（Bi 2212）单晶，是基于隧道特性的c轴堆叠的本征约瑟夫森结在梅萨上的热分析。尽管梅萨体积大（例如，40 × 300 × 1.2 mum 3）和功率耗散，导致电流-电压曲线（I-V）的自加热和回弯，存在可以观察到显著极化太赫兹波发射的可接近的偏置条件。我们通过将准粒子电阻Rqp（T）与包括回弯区域在内的整个I-V上的V/I比相等来估计梅萨温度。这些温度用于预测到达我们的测辐射热计的非偏振黑体辐射，并且在整个I-V上存在实质性的一致性。因此，如芬顿首先讨论的，回弯是由Bi 2212的特定Rqp（T）引起的，而不是对能隙的显著抑制。该模型还正确地预测了在~60 K以上观察到的回弯消失。
We present a thermal analysis of a patterned mesa on a Bi2Sr2CaCu2O8 (Bi2212) single crystal that is based on tunneling characteristics of the c-axis stack of ~800 intrinsic Josephson junctions in the mesa. Despite the large mesa volume (e.g., 40 times 300 times 1.2 mum3) and power dissipation that result in self-heating and backbending of the current-voltage curve (I-V), there are accessible bias conditions for which significant polarized THz-wave emission can be observed. We estimate the mesa temperature by equating the quasiparticle resistance, Rqp(T), to the ratio V/I over the entire I-V including the backbending region. These temperatures are used to predict the unpolarized black-body radiation reaching our bolometer and there is substantial agreement over the entire I-V. As such, backbending results from the particular Rqp(T) for Bi2212, as first discussed by Fenton, rather than a significant suppression of the energy gap. This model also correctly predicts the observed disappearance of backbending above ~60 K.