利用AC约瑟夫森效应探测莫特波瓣
Probing Mott lobes via the AC Josephson effect
摘要：
研究了两个弱耦合玻色哈伯德模型组成的系统中的交流约瑟夫森效应。在平均场论的框架下，Gross-Pitaevskii方程表明，约瑟夫森电流的振幅与超流序参量的乘积成正比。此外，通过精确的数值计算，得到了小尺度体系的化学势-流关系。这使我们能够提出一个可行的实验方案来测量量子相变的莫特波瓣。
英文摘要：
The alternating-current (AC) Josephson effect is studied in a system consisting of two weakly coupled Bose Hubbard models. In the framework of the mean field theory, Gross-Pitaevskii equations show that the amplitude of the Josephson current is proportional to the product of superfluid order parameters. In addition, the chemical potential--current relation for a small size system is obtained via the exact numerical computation. This allows us to propose a feasible experimental scheme to measure the Mott lobes of the quantum phase transition.
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