Sauer R, Sternschulte H, Wahl S, Thonke K, Anthony TR
Abteilung Halbleiterphysik, Universitat Ulm, 89069 Ulm, Germany.
Phys Rev Lett. 2000 May 1;84(18):4172-5. doi: 10.1103/PhysRevLett.84.4172.
We study low-strain synthetic high pressure, high temperature diamonds by cathodoluminescence and observe novel fine structure in the free exciton and the boron-bound exciton emission. The basic spectral structure is a doublet with DeltaE approximately 11 meV common to both exciton spectra. This resolves the previously found inequivalence of free exciton ( approximately 7 meV) and bound exciton ( approximately 12 meV) fine splitting. It is argued that for a spin-orbit interaction Delta(0) much smaller than the excitonic binding ( E(X) approximately 80 meV) and the excitonic localization ( E(loc) approximately 51 meV) at the boron acceptor, the orbital momentum and the spin of the particles constituting the electron-hole pair are recoupled to form spin singlet and triplet exciton states as the elementary excitations.
我们通过阴极发光研究了低应变合成高压高温钻石，并在自由激子和硼束缚激子发射中观察到了新颖的精细结构。基本光谱结构是一个双线态，两个激子光谱的ΔE约为11 meV。这解决了先前发现的自由激子（约7 meV）和束缚激子（约12 meV）精细分裂的不等效性。有人认为，对于自旋 - 轨道相互作用Δ(0)远小于硼受主处的激子束缚能（E(X)约80 meV）和激子局域化能（E(loc)约51 meV）的情况，构成电子 - 空穴对的粒子的轨道动量和自旋会重新耦合，形成作为基本激发的自旋单重态和三重态激子态。
