Ideal two-dimensional Fermi liquid system Bi2O2Se single crystal and preparation method and application thereof

Abstract

The invention discloses an ideal two-dimensional Fermi liquid system Bi2O2Se single crystal, and belongs to the field of electronic materials. The crystal structure of the Bi2O2Se single crystal is atetragonal crystal system, and the space group is I4 / mmm (139). The Bi2O2Se single crystal can be prepared by using a chemical vapor-phase transport method (i.e. a sublimation method) and a solidification crystallization method. The Bi2O2Se single crystal which is obtained through growth by using the two methods is of a sheet shape, and the crystal has a size range of millimeters, high purity andgood chemical composition uniformity. In a wide temperature range of 2-300 K, the experimentally-measured resistivity of the Bi2O2Se crystal is proportional to the square of temperature (T<2>), the Fermi liquid theory is conformed, and the Bi2O2Se single crystal is an ideal two-dimensional Fermi liquid system. In addition, the electron mobility of the Bi2O2Se crystal is not less than 2.24x10<5> cm<2>V<-1>s<-1> at 2 K and 300 cm<2>V<-1>s<-1> at 300 K separately, and the Bi2O2Se has good stability in air, so good application prospects are achieved in the field of future electronic devices; and meanwhile the Bi2O2Se has a simple growth method and low cost, and is conducive to industrial production.

Description

technical field [0001] The invention belongs to the field of electronic materials, in particular to an ideal two-dimensional Fermi liquid system—Bi 2 o 2 Se single crystal and its preparation method and application. Background technique [0002] The Landau Fermi liquid theory is a phenomenological theory describing the quasiparticle behavior of the interacting fermion system and the corresponding physical properties of the system. This theory was first applied to explain 3 In He's question. Subsequently, under the premise of ignoring the potential energy of the periodic lattice in the metal, this theory was slightly modified and extended to deal with the electron problem in the metal, which is called the gel model of the metal. The underlying assumption is that a group of interacting particles can be described by a gas of nearly non-interacting quasiparticles. On the physical picture, a quasiparticle can be regarded as an independent electron moving under the mean field ...

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Problems solved by technology

However, so far, the number of such crystalline materials that conform to the ideal Fermi liquid theory has been discovered is very small

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