Fermi-Diracn.

Brit.

/ˌfəːmɪdᵻˈrak/,

/ˌfɛːmɪdᵻˈrak/, U.S.

/ˌfɛrmidəˈræk/,

/ˌfərmidəˈræk/

Etymology: < the names of Enrico Fermi (see Fermi n.) and P. A. M. Dirac (1902–84), English physicist.

Used to designate certain results and concepts in physics arising out of the work of Fermi and Dirac.

a. Fermi-Dirac statistics n. a type of quantum statistics used to describe systems of identical particles that have wave-functions that are antisymmetric with respect to an interchange of co-ordinates of any two particles.

ΘΚΠ

the world > matter > physics > quantum theory > quantum mechanics > symmetry, conserved properly > [noun] > statistics of

Fermi statistics1927

Fermi-Dirac statistics1928

Fermi distribution1955

1927 Proc. Royal Soc. A. 108 433 It has..seemed worth while to reopen the discussion by examining..a quite general form of statistical mechanics of which the classical form and Einstein's and Fermi-Dirac's are special cases.]

1928 Proc. Physical Soc. 40 329 Degeneracy in the Fermi-Dirac statistics occurs when λ is large and negative.

1931 Physical Rev. 37 333 We..justify the assumption that the clusters satisfy the Einstein–Bose or Fermi–Dirac statistics according to whether the number of particles in each cluster is even or odd.

1957 Encycl. Brit. VIII. 218/2 The electrons in the metal obey the so-called ‘Fermi-Dirac statistics’, which means that they have only a very small specific heat.

b. Fermi-Dirac distribution n. (also Fermi-Dirac distribution function) a distribution function of the number of particles in a system of fermions that have a given energy.

ΘΚΠ

the world > matter > physics > quantum theory > quantum mechanics > symmetry, conserved properly > [noun] > statistics of > distribution function

Fermi-Dirac distribution1933

1933 G. P. Harnwell & J. J. Livingood Exper. Atomic Physics vi. 192 The distribution function..which is known as the Fermi-Dirac distribution.

1968 C. G. Kuper Introd. Theory Superconductivity ii. 33 Then the distribution function for quasiparticles will be the normal Fermi-Dirac distribution f(E) = {1 + exp(βE)}^{− 1}, where β = 1/kT.

This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).

单词	fermi-dirac
释义	Fermi-Diracn. Brit. /ˌfəːmɪdᵻˈrak/, /ˌfɛːmɪdᵻˈrak/, U.S. /ˌfɛrmidəˈræk/, /ˌfərmidəˈræk/ Etymology: < the names of Enrico Fermi (see Fermi n.) and P. A. M. Dirac (1902–84), English physicist. Used to designate certain results and concepts in physics arising out of the work of Fermi and Dirac. a. Fermi-Dirac statistics n. a type of quantum statistics used to describe systems of identical particles that have wave-functions that are antisymmetric with respect to an interchange of co-ordinates of any two particles. ΘΚΠ the world > matter > physics > quantum theory > quantum mechanics > symmetry, conserved properly > [noun] > statistics of Fermi statistics1927 Fermi-Dirac statistics1928 Fermi distribution1955 1927 Proc. Royal Soc. A. 108 433 It has..seemed worth while to reopen the discussion by examining..a quite general form of statistical mechanics of which the classical form and Einstein's and Fermi-Dirac's are special cases.] 1928 Proc. Physical Soc. 40 329 Degeneracy in the Fermi-Dirac statistics occurs when λ is large and negative. 1931 Physical Rev. 37 333 We..justify the assumption that the clusters satisfy the Einstein–Bose or Fermi–Dirac statistics according to whether the number of particles in each cluster is even or odd. 1957 Encycl. Brit. VIII. 218/2 The electrons in the metal obey the so-called ‘Fermi-Dirac statistics’, which means that they have only a very small specific heat. b. Fermi-Dirac distribution n. (also Fermi-Dirac distribution function) a distribution function of the number of particles in a system of fermions that have a given energy. ΘΚΠ the world > matter > physics > quantum theory > quantum mechanics > symmetry, conserved properly > [noun] > statistics of > distribution function Fermi-Dirac distribution1933 1933 G. P. Harnwell & J. J. Livingood Exper. Atomic Physics vi. 192 The distribution function..which is known as the Fermi-Dirac distribution. 1968 C. G. Kuper Introd. Theory Superconductivity ii. 33 Then the distribution function for quasiparticles will be the normal Fermi-Dirac distribution f(E) = {1 + exp(βE)}^{− 1}, where β = 1/kT. This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022). < n.1928
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