Nanooptics and photonics

Spatial structures of electron-hole liquid
in 2D semiconductor systems
Chernyuk A.A., Sugakov V.I
Theoretical Physics Department, Institute for Nuclear Research, NAS of Ukraine
prosp. Nauki, 47, Kyiv 03680, Ukraine, inr@ukr.net

The electron-hole liquid (EHL) was observed recently in low dimensional sys-tems of various materials: in silicon semiconductor systems [1], in QW’s and su-perlattices based on AlGaAs, in dichalcogenides heterostructures MoHe2 and MoS2 [2,3]. Spatial structures in 2D systems, created and controlled by light, can be pro-mising for optoelectronics. But electron-hole droplets (islands in 2D systems) and interaction between them have not been observed so far. In this work we consider the effects of interaction between islands of EHL using a statistical model and with interaction via the density of excitons nearby the islands [4]. The theory predicts the most probable state. We have studied two restricted systems, in which islands of EHL arise: a strip and a disk. The islands radius, the distance between them and fluctuation of this distance, the number of islands, which may arise in the disk, were calculated depending on the temperature and the pumping (Figs. 1, 2).
		
Fig.1: structures at disk-shaped irradiation	Fig.2: the number of islands along the disk edge	

1. Burbaev T.M., Kozyrev D.S., Sibeldin N.N. et al. // JETP Letters.-2014.-98.-P. 823-828.
2. Arp T.B., Pleskot D., Aji V. et al. // Nature Photonics.-2019.-13.-P. 245-250.
3. Bataller A.W., Younts R.A., Rustagi A. et al. // Nano Letters.-2019.-19.-P. 1104-1111.
4. Sugakov V.I. // Phys. Rev. B.-2007.-76.-P. 115303.