RESUMEN
We report on systematic study of transport properties of a 1000 nm HgTe film. Unlike thinner and strained HgTe films, which are known as high-quality three-dimensional topological insulators, the film under study is much thicker than the limit of pseudomorphic growth of HgTe on a CdTe substrate. Therefore, the 1000 nm HgTe film is expected to be fully relaxed and has the band structure of bulk HgTe, i.e. a zero gap semiconductor. Additionally, the system is characterized by the bands inversion, so that the two-dimensional topological surface states (TSSs) are expected to exist. To check this claim we studied classical and quantum transport response of the system. We demonstrate that by tuning the top-gate voltage one can change the electron-dominating transport to the hole one. The highest electron mobility is found to be more than300×103 cm2 Vs-1. The system exhibits Shubnikov-de Haas (SdH) oscillations with a complicated pattern and shows up to five independent frequencies in corresponding Fourier spectra. These Fourier peaks are attributed to the TSSs, Volkov-Pankratov states and spin-degenerate bulk states in the accumulation layer near the gate. The observed peculiarities of the quantum transport are the strong SdH oscillations of the Hall resistance, and the suppressed oscillatory response of the TSSs.
RESUMEN
UNLABELLED: INTRODUCTIOD: Over the past 15 years, the relative frequency of detection of erosive form of GERD has increased from 3,1 to 16%. Manifestations of GERD in different ethnic populations of Yakutia are not well understood. AIM: Studying kliniko-endoscopic and the morfofunktsionalnykh of features of GERD in various ethnic groups living in conditions of Yakutia. MATERIALS AND METHODS: The study included 168 patients with GERD of different ethnic origins. Yakuts, Evens and Evenks, were considered as indigenous people and newcomers were all persons of other nationalities, who arrived at different times from other regions of Russia. The average age was 41.75 ± 24.73 years. RESULTS: Clinical manifestations of GERD in different ethnic groups living in Yakutia. Leukoplakia of the esophagus was detected in the indigenous population are four times more likely than newcomers. With GERD associated with thyroid disorders prevalent low level of contamination of Helicobacter pylori. Helicobacter pylori infection in patients with GERD in Yakutia was higher among immigrants than among the indigenous, with a high degree of contamination of Helicobacter pylori was detected more frequently in immigrants than among the indigenous. Pathological gastroesophageal reflux during the daily pH-metry of the esophagus was detected more frequently in patients visiting than among the indigenous. CONCLUSIONS: The found features of a current of GERD can be further the basis for the individualized and differentiated approaches to treatment of this disease.
