Cherenkov terahertz radiation from Dirac semimetals surface plasmon polaritons excited by an electron beam<xref rid="cpb_29_3_034101fn1" ref-type="fn">*</xref><fn id="cpb_29_3_034101fn1"><label>*</label><p>Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0701000), the National Key Scientific Instrument and Equipment Development of China (Grant No. 2018YFF01013001), and the National Natural Science Foundation of China (Grant Nos. 61701084 and 61505022).</p></fn>

Cherenkov terahertz radiation from Dirac semimetals surface plasmon polaritons excited by an electron beam**

Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0701000), the National Key Scientific Instrument and Equipment Development of China (Grant No. 2018YFF01013001), and the National Natural Science Foundation of China (Grant Nos. 61701084 and 61505022).

Zhao Tao, Wu Zhenhua^†

The radiation frequency versus the chemical potential and the beam energy β (the ratio of the electron velocity to the speed of light).