An ideal two-dimensional Fermi liquid system bi 2 o 2 Se single crystal and its preparation method and application

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, and particularly relates to an ideal two-dimensional Fermi liquid system—Bi2O2Se single crystal and its preparation method and application.Background technique[0002]Landau Fermi Liquid Theory is a phenomenological theory describing the quasi-particle behavior of interacting fermion systems and the corresponding physical properties of the system. This theory was first applied to explain3He’s in question. Subsequently, under the premise of ignoring the potential energy of the periodic lattice in metals, this theory was modified with a small amount and was extended to deal with electronic problems in metals. This model is called the gel model of metals. The basic assumption is that a group of interacting particles can be described by a quasi-particle gas with almost no interaction. In the physical image, a quasiparticle can be regarded as an independent electron moving under the average field formed by oth...

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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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