Hall Effect in Graphite and Its Relation to the Trigonal Warping of the Energy Bands. II. Theoretical

Low field Hall coefficient R in well-crystalline graphite is positive at low temperatures. R reveals a maximum around 0.2 kOe at low temperatures and decreases rapidly with H →0. This trend can not be eplained without invoking the trigonal warping of the bands. The trigonal warping appreciably modifies the electron bands, and the harmonics induced by the trigonal warping corresponds to the appearance of the small effective mass carriers. This effect predominates over the contribution due to the holes around H -point. An exact calculation of R ( H →0) is carried out for γ 3 =0.29 eV, and the comparison with our measurements (I. Experimental) is performed.