[Physics Journal Club] -2017.04.11

CQMS | 2017.04.10 21:32 | 조회 1128

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제목: Superfluid plasma frequency and condensation gap evolution in excitonic insulator, Ta2NiSe5

초록:

Ta2NiSe5 is an interesting anisotropic material, well known as one of the few excitonic insulators proposed over 50 years ago. Ta2NiSehas quasi-one dimensional chains along the a-axis. In this study, we have investigated the anisotropic optical properties of a single crystal Ta2NiSe5 along the a- and c-axes. The measured a- and c-axis optical conductivities exhibit large anisotropic electronic and phononic properties. With regard to the a-axis optical conductivity, a sharp peak near 3050 cm-1 at 9 K, with a well-defined optical gap (EI  ~1800 cm-1) and a strong temperature dependence, is observed. With an increase in temperature, this peak broadens and the optical energy gap closes around ~ 325 K (Tc). The spectral weight redistribution with respect to the frequency and temperature indicates that the normalized optical energy gap (EI(T)EI(0)) is 1(T/Tc )2. For the first time, the temperature-dependent superfluid plasma frequency of the excitonic condensation in Ta2NiSe5 (ωsf  ~ 7180 cm-1 at 9 K) has been determined from measured optical data. Our findings may pave the way for exciting new avenues for future research on excitonic insulators.

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