论文标题
Dirac半准TLSB中的散装超导性
Bulk Superconductivity in the Dirac Semimetal TlSb
论文作者
论文摘要
实现Majorana fermions的一种可行策略是寻找具有散装超导性和狄拉克表面状态的简单化合物。在本文中，我们对电子带结构，费米表面和表面状态进行了计算，并测量了具有CSCL型结构的TLSB化合物的电阻率，磁化强度，比热。频带结构的计算表明，当考虑自旋轨道耦合时，TLSB是狄拉克半学。 Meanwhile, we first found that TlSb is a type-II superconductor with $T_c$ = 4.38 K, $H_{c1}$(0) = 148 Oe, $H_{c2}$(0) = 1.12 T and $κ_{GL}$ = 10.6, and confirmed it to be a moderately coupled s-wave superconductor.尽管我们无法确定负责超导性的费米级$ e_f $附近的频段，但它与拓扑表面状态的共存意味着TLSB化合物可能是实现易于断层量子计算的简单材料平台。
A feasible strategy to realize the Majorana fermions is searching for a simple compound with both bulk superconductivity and Dirac surface states. In this paper, we performed calculations of electronic band structure, the Fermi surface and surface states, as well as measured the resistivity, magnetization, specific heat for TlSb compound with a CsCl-type structure. The band structure calculations show that TlSb is a Dirac semimetal when spin-orbit coupling is taken into account. Meanwhile, we first found that TlSb is a type-II superconductor with $T_c$ = 4.38 K, $H_{c1}$(0) = 148 Oe, $H_{c2}$(0) = 1.12 T and $κ_{GL}$ = 10.6, and confirmed it to be a moderately coupled s-wave superconductor. Although we can not determine which bands near the Fermi level $E_F$ to be responsible for superconductivity, its coexistence with the topological surface states implies that TlSb compound may be a simple material platform to realize the fault-tolerant quantum computations.
