From the ediorial board

“25th anniversary of the Physics-Uspekhi website” Phys. Usp. 63 1–1 (2020)

Reviews of topical problems

G.V. Fetisov “X-ray diffraction methods for structural diagnostics of materials: progress and achievements” Phys. Usp. 63 2–32 (2020)

S.Ya. Vetrov, I.V. Timofeev, V.F. Shabanov “Localized modes in chiral photonic structures” Phys. Usp. 63 33–56 (2020)

Methodological notes

S.V. Goupalov “Classical problems with the theory of elasticity and the quantum theory of angular momentum” Phys. Usp. 63 57–65 (2020)

Conferences and symposia

“X-ray optics: how and what is to be seen (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 22 May 2019)” Phys. Usp. 63 66–66 (2020)

N.I. Chkhalo, I.V. Malyshev, A.E. Pestov, V.N. Polkovnikov, N.N. Salashchenko, M.N. Toropov “Diffraction limited X-ray optics: technology, metrology, applications” Phys. Usp. 63 67–82 (2020)

V.N. Polkovnikov, N.N. Salashchenko, M.V. Svechnikov, N.I. Chkhalo “Beryllium-based multilayer X-ray optics” Phys. Usp. 63 83–95 (2020)

Letters to the editors

M.L. Shmatov “Once again on the Gatchina discharge and ball lightning (comments on G.D. Shabanov's paper "On the possibility of making natural ball lightning using a new pulse discharge type in the laboratory" [Phys. Usp. 62 92 (2019); Usp. Fiz. Nauk 189 95 (2019)])” Phys. Usp. 63 96–98 (2020)

G.D. Shabanov “On relation between theoretical and experimental components in the papers on ball lightning (reply to M.L. Shmatov's comments [Usp. Fiz. Nauk 190 107 (2020)] on the paper "On the possibility of making natural ball lightning using a new pulse discharge type in the laboratory" [Phys. Usp. 62 92 (2019); Usp. Fiz. Nauk 189 95 (2019)])” Phys. Usp. 63 99–100 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 101–102 (2020)

Reviews of topical problems

S.A. Aseyev, A.S. Akhmanov, G.V. Girichev, A.A. Ischenko, I.V. Kochikov, V.Ya. Panchenko, E.A. Ryabov “Structural dynamics of free molecules and condensed matter” Phys. Usp. 63 103–122 (2020)

S.S. Gavrilov “Nonequilibrium transitions, chaos, and chimera states in exciton—polariton systems” Phys. Usp. 63 123–144 (2020)

G.I. Strelkova, V.S. Anishchenko “Spatio-temporal structures in ensembles of coupled chaotic systems” Phys. Usp. 63 145–161 (2020)

A.A. Askadskii, T.A. Matseevich “Latest developments of models and calculation schemes for the quantitative analysis of the physical properties of polymers” Phys. Usp. 63 162–191 (2020)

Methodological notes

V.S. Pronskikh “Measurement problems: contemporary discussions and models” Phys. Usp. 63 192–200 (2020)

Personalia

M.Ya. Azbel’, A.F. Andreev, B.M. Bolotovskii, A.Yu. Grosberg, N.M. Kreines, L.S. Levitov, L.P. Pitaevskii, V.L. Pokrovskii, E.I. Rashba, A.I. Smirnov, D.E. Khmel’nitskii, A.V. Chubukov “In memory of Moisei Isaakovich Kaganov” Phys. Usp. 63 201–203 (2020)

V.M. Bouznik, V.V. Voronov, S.V. Garnov, M.P. Egorov, V.K. Ivanov, M.V. Kovalchuk, V.I. Konov, G.Ya. Krasnikov, E.E. Lomonova, P.P. Pashinin, V.B. Tsvetkov, I.A. Shcherbakov “In memory of Vyacheslav Vasil'evich Osiko” Phys. Usp. 63 204–206 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 207–208 (2020)

Reviews of topical problems

A.V. Tutukov, A.M. Cherepashchuk “Evolution of close binary stars: theory and observations” Phys. Usp. 63 209–244 (2020)

G.N. Makarov “New results for laser isotope separation using low-energy methods” Phys. Usp. 63 245–268 (2020)

A.B. Borisov “Localized structures in magnetic systems without the center of inversion” Phys. Usp. 63 269–288 (2020)

Instruments and methods of investigation

T.A. Isaev “Direct laser cooling of molecules” Phys. Usp. 63 289–302 (2020)

Methodological notes

A.P. Potylitsyn, D.Yu. Sergeeva, M.N. Strikhanov, A.A. Tishchenko “Diffraction radiation from a charge as radiation from a superluminal source in a vacuum” Phys. Usp. 63 303–308 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 309–310 (2020)

Reviews of topical problems

Yu.V. Gulyaev, A.S. Bugaev, V.M. Rozenbaum, L.I. Trakhtenberg “Nanotransport controlled by means of the ratchet effect” Phys. Usp. 63 311–326 (2020)

D.S. Sanditov “Nature of Poisson's ratio of amorphous polymers and glasses and its relation to structure-sensitive properties” Phys. Usp. 63 327–341 (2020)

A.I. Gusev “High-energy ball milling of nonstoichiometric compounds” Phys. Usp. 63 342–364 (2020)

Instruments and methods of investigation

E.Z. Gusakov, A.Yu. Popov “Low-power-threshold parametric decay instabilities of powerful microwave beams in toroidal fusion devices” Phys. Usp. 63 365–387 (2020)

S.I. Moshkunov, V.Yu. Khomich “Method of detection and spectrometry of charged particles produced in a superstrong electromagnetic field based on their transport by the magnetic field of a coaxial line” Phys. Usp. 63 388–394 (2020)

Methodological notes

I.F. Ginzburg “Particles in finite and infinite one-dimensional chains” Phys. Usp. 63 395–406 (2020)

B.I. Sturman “Ballistic and shift currents in the bulk photovoltaic effect theory” Phys. Usp. 63 407–411 (2020)

Personalia

L.N. Bogdanova, S.I. Vinitskii, S.S. Gershtein, D.L. Demin, D.I. Kazakov, V.I. Korobov, V.A. Matveev, V.S. Melezhik, Yu.T. Oganessian, V.A. Rubakov, A.A. Yukhimchuk, M.P. Faifman “In memory of Leonid Ivanovich Ponomarev” Phys. Usp. 63 412–413 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 414–415 (2020)

Reviews of topical problems

V.N. Ryzhov, E.E. Tareyeva, Yu.D. Fomin, E.N. Tsiok “Complex phase diagrams of systems with isotropic potentials: results of computer simulations” Phys. Usp. 63 417–439 (2020)

Physics of our days

L.I. Men’shikov, P.L. Menshikov, P.O. Fedichev “Effects of action at a distance in water” Phys. Usp. 63 440–486 (2020)

Instruments and methods of investigation

V.G. Lukin, O.G. Khvostenko “Desorption processes in the measurement of weak currents” Phys. Usp. 63 487–499 (2020)

Methodological notes

A.I. Frank “Interaction of a wave with an accelerating object and the equivalence principle” Phys. Usp. 63 500–502 (2020)

From the history of physics

D.I. Trubetskov, G.M. Vdovina “Traveling wave tubes: a history of people and fates” Phys. Usp. 63 503–515 (2020)

Personalia

A.E. Bondar, A.I. Vainshtein, M.I. Vysotskii, A.S. Gorskii, M.V. Danilov, A.D. Dolgov, A.Yu. Morozov, V.A. Novikov, V.Yu. Petrov, V.A. Rubakov, M.A. Shifman, M.I. Eides “In memory of Mikhail Borisovich Voloshin” Phys. Usp. 63 516–517 (2020)

Bibliography

E.V. Zakharova “New books on physics and related sciences” Phys. Usp. 63 518–520 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 521–522 (2020)

Reviews of topical problems

V.V. Brazhkin “Ultrahard nanomaterials: myths and reality” Phys. Usp. 63 523–544 (2020)

V.N. Dolgunin, A.N. Kudi, M.A. Tuev “Mechanisms and kinetics of gravity separation of granular materials” Phys. Usp. 63 545–561 (2020)

V.E. Panchuk, Yu.Yu. Balega, V.G. Klochkova, M.E. Sachkov “Study of exoplanets by spectroscopic methods” Phys. Usp. 63 562–582 (2020)

Physics of our days

V.I. Dokuchaev, N.O. Nazarova “Silhouettes of invisible black holes” Phys. Usp. 63 583–600 (2020)

Methodological notes

V.I. Ritus “Generalization of the k coefficient method in relativity to an arbitrary angle between the velocity of an observer (source) and the direction of the light ray from (to) a faraway source (observer) at rest” Phys. Usp. 63 601–610 (2020)

A.S. Dzarakhokhova, N.P. Zaretskii, A.V. Maksimychev, L.I. Men’shikov, P.L. Menshikov “Identity of the mechanisms of Weibel and Alfvén-cyclotron plasma instabilities” Phys. Usp. 63 611–616 (2020)

N.S. Kardashev, I.D. Novikov, S.V. Repin “Wormholes with entrances close to each other” Phys. Usp. 63 617–621 (2020)

Personalia

Yu.Yu. Balega, L.I. Gurvits, R.D. Dagkesamanskii, L.M. Zelenyi, K.I. Kellermann, Yu.Yu. Kovalev, N.N. Kolachevsky, A.A. Konovalenko, V.G. Kurt, I.D. Novikov, Yu.N. Pariiskii, A.M. Cherepashchuk “In memoria of Nikolai Semenovich Kardashev” Phys. Usp. 63 622–624 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 625–627 (2020)

Reviews of topical problems

Z.D. Kvon, D.A. Kozlov, E.B. Olshanetsky, G.M. Gusev, N.N. Mikhailov, S.A. Dvoretsky “Topological insulators based on HgTe” Phys. Usp. 63 629–647 (2020)

E.D. Eidelman, A.V. Arkhipov “Field emission from carbon nanostructures: models and experiment” Phys. Usp. 63 648–667 (2020)

Yu.I. Ustinovshchikov “Pairwise interatomic interaction in alloys” Phys. Usp. 63 668–682 (2020)

O.G. Onishchenko, O.A. Pokhotelov, N.M. Astaf’eva, W. Horton, V.N. Fedun “Structure and dynamics of concentrated mesoscale vortices in planetary atmospheres” Phys. Usp. 63 683–697 (2020)

Physics of our days

A.M. Zheltikov, M.O. Scully “Photon entanglement for life-science imaging: rethinking the limits of the possible” Phys. Usp. 63 698–707 (2020)

Instruments and methods of investigation

V.L. Vaks, V.A. Anfertev, V.Yu. Balakirev, S.A. Basov, E.G. Domracheva, A.V. Illyuk, P.V. Kupriyanov, S.I. Pripolzin, M.B. Chernyaeva “High resolution terahertz spectroscopy for analytical applications” Phys. Usp. 63 708–720 (2020)

Methodological notes

S.V. Petrov “Was Sommerfeld wrong? (To the history of the appearance of spin in relativistic wave equations)” Phys. Usp. 63 721–724 (2020)

Personalia

L.A. Bol’shov, E.P. Velikhov, V.I. Il’gisonis, A.N. Lagar’kov, V.B. Mintsev, A.P. Napartovich, G.E. Norman, O.F. Petrov, V.P. Smirnov, E.E. Son, V.E. Fortov, V.E. Cherkovets “In memory of Andrei Nikonovich Starostin” Phys. Usp. 63 725–727 (2020)

E.B. Aleksandrov, A.M. Bykov, A.G. Zabrodskii, A.V. Ivanchik, A.D. Kaminker, A.A. Kaplyanskii, S.A. Levshakov, N.N. Rozanov, R.A. Suris, R.A. Sunyaev, V.K. Khersonsky, D.G. Yakovlev “In memory of Dmitrii Aleksandrovich Varshalovich” Phys. Usp. 63 728–729 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 730–731 (2020)

Reviews of topical problems

I.K. Razumov, A.Y. Yermakov, Yu.N. Gornostyrev, B.B. Straumal “Nonequilibrium phase transformations in alloys under severe plastic deformation” Phys. Usp. 63 733–757 (2020)

Physics of our days

I.M. Dremin “Ultraperipheral nuclear interactions” Phys. Usp. 63 758–765 (2020)

N.L. Popov, I.A. Artyukov, A.V. Vinogradov, V.V. Protopopov “Wave packet in the phase problem in optics and ptychography” Phys. Usp. 63 766–774 (2020)

Methodological notes

E.A. Vinogradov “Optical phonons with a negative oscillator strength” Phys. Usp. 63 775–781 (2020)

Conferences and symposia

“Earth embosomed by the Sun: heliophysics and space weather (Scientific session of the Physical Sciences Division of the Russian Academy of Sciences, 5 June 2019)” Phys. Usp. 63 782–782 (2020)

S.A. Bogachev, A.S. Ulyanov, A.S. Kirichenko, I.P. Loboda, A.A. Reva “Microflares and nanoflares in the solar coron” Phys. Usp. 63 783–800 (2020)

A.A. Petrukovich, H.V. Malova, V.Yu. Popov, E.V. Maiewski, V.V. Izmodenov, O.A. Katushkina, A.A. Vinogradov, M.O. Riazantseva, L.S. Rakhmanova, T.V. Podladchikova, G.N. Zastenker, Yu.I. Yermolaev, I.G. Lodkina, L.S. Chesalin “Modern view of the solar wind from micro to macro scales” Phys. Usp. 63 801–811 (2020)

V.D. Kuznetsov, A.I. Osin “Heliophysics: from observations to models and applications” Phys. Usp. 63 812–817 (2020)

A.L. Lysenko, D.D. Frederiks, G.D. Fleishman, R.L. Aptekar, A.T. Altyntsev, S.V. Golenetskii, D.S. Svinkin, M.V. Ulanov, A.E. Tsvetkova, A.V. Ridnaia “X-ray and gamma-ray emission from solar flares” Phys. Usp. 63 818–832 (2020)

Personalia

Yu.Yu. Balega, D.V. Bisikalo, L.M. Zelenyi, M.Ya. Marov, A.A. Petrukovich, K.A. Postnov, V.A. Rubakov, N.A. Sakhibullin, A.A. Starobinskii, R.A. Sunyaev, E.M. Churazov, B.M. Shustov “Anatolii Mikhailovich Cherepashchuk (on his 80th birthday)” Phys. Usp. 63 833–834 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 835–836 (2020)

Reviews of topical problems

M.Ya. Marov, I.I. Shevchenko “Exoplanets: nature and models” Phys. Usp. 63 837–871 (2020)

Yu.V. Gulyaev, S.V. Tarasenko, V.G. Shavrov “Electromagnetic analogue of a first-type leaky surface elastic wave for the single interface between transparent dielectric media” Phys. Usp. 63 872–887 (2020)

I.K. Gainullin “Resonant charge transfer during ion scattering on metallic surfaces” Phys. Usp. 63 888–906 (2020)

V.V. Lider “Precise determination of crystal lattice parameters” Phys. Usp. 63 907–928 (2020)

Methodological notes

K.Yu. Todyshev “Measuring the inclusive cross section of e⁺e⁻ annihilation into hadrons in the pre-asymptotic energy range” Phys. Usp. 63 929–939 (2020)

Personalia

A.F. Andreev, V.M. Galitskii, B.I. Ivlev, I.V. Kolokolov, L.S. Levitov, V.P. Mineev, Yu.V. Nazarov, L.P. Pitaevskii, V.L. Pokrovskii, V.B. Timofeev, I.M. Khalatnikov, R.P. Shibaeva “Gerasim Matveevich Eliashberg (on his 90th birthday)” Phys. Usp. 63 940–941 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 942–943 (2020)

Reviews of topical problems

S.A. Nikitov, A.R. Safin, D.V. Kalyabin, A.V. Sadovnikov, E.N. Beginin, M.V. Logunov, M.A. Morozova, S.A. Odintsov, S.A. Osokin, A.Yu. Sharaevskaya, Yu.P. Sharaevsky, A.I. Kirilyuk “Dielectric magnonics: from gigahertz to terahertz” Phys. Usp. 63 945–974 (2020)

V.M. Murav’ev, I.V. Kukushkin “Collective plasma excitations in two-dimensional electron systems” Phys. Usp. 63 975–993 (2020)

K.V. Reich “Conductivity of quantum dot arrays” Phys. Usp. 63 994–1014 (2020)

A.I. Savvatimskii, S.V. Onufriev “Investigation of the physical properties of carbon under high temperatures (experimental studies)” Phys. Usp. 63 1015–1036 (2020)

Methodological notes

S.F. Garanin, S.D. Kuznetsov “Irrotational flow (of a magnetic field or incompressible fluid) around a screen with a slot” Phys. Usp. 63 1037–1042 (2020)

Personalia

A.V. Gaponov-Grekhov, G.G. Denisov, V.V. Zheleznyakov, V.E. Zakharov, V.A. Zverev, E.A. Kuznetsov, A.G. Litvak, A.I. Malekhanov, E.A. Mareev “In memory of Vladimir Il'ich Talanov” Phys. Usp. 63 1043–1045 (2020)

A.V. Gaponov-Grekhov, Yu.V. Gulyaev, S.N. Gurbatov, G.G. Denisov, V.E. Zakharov, A.G. Litvak, V.I. Nekorkin, S.A. Nikitov, M.I. Rabinovich, O.V. Rudenko, A.M. Sergeev, V.V. Tuchin “In memory of Dmitrii Ivanovich Trubetskov” Phys. Usp. 63 1046–1047 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 1048–1049 (2020)

Reviews of topical problems

M.M. Glazov, R.A. Suris “Collective states of excitons in semiconductors” Phys. Usp. 63 1051–1071 (2020)

N.L. Bobrov “Spectroscopy of electron—phonon interaction of superconducting point contacts: experimental aspects” Phys. Usp. 63 1072–1091 (2020)

Physics of our days

G.R. Ivanitskii, A.A. Morozov “Subject of study — the aging brain” Phys. Usp. 63 1092–1113 (2020)

Instruments and methods of investigation

E.Z. Gusakov, A.Yu. Popov “Scattering theory of strongly refracting microwaves in turbulent inhomogeneous plasma. Applications of the theory to the description of fluctuation reflectometry in thermonuclear fusion devices” Phys. Usp. 63 1114–1139 (2020)

From the history of physics

V.S. Bystrov, V.M. Fridkin “Two-dimensional ferroelectrics and homogeneous switching. On the 75th anniversary of the Landau—Ginzburg theory of ferroelectricity” Phys. Usp. 63 1140–1147 (2020)

Personalia

V.S. Beskin, M.A. Vasil’ev, A.V. Gaponov-Grekhov, L.M. Zelenyi, K.P. Zybin, Ya.N. Istomin, N.N. Kolachevsky, G.A. Mesyats, L.P. Pitaevskii, M.O. Ptitsyn, V.I. Ritus “Aleksandr Viktorovich Gurevich (on his 90th birthday)” Phys. Usp. 63 1148–1150 (2020)

E.P. Velikhov, A.V. Gaponov-Grekhov, G.G. Denisov, V.V. Zheleznyakov, L.M. Zelenyi, R.I. Ilkaev, G.A. Mesyats, V.A. Rubakov, A.M. Sergeev, V.E. Fortov, E.A. Khazanov, I.A. Shcherbakov “Aleksandr Grigor'evich Litvak (on his 80th birthday)” Phys. Usp. 63 1151–1153 (2020)

Bibliography

E.V. Zakharova “New books on physics and related sciences” Phys. Usp. 63 1154–1156 (2020)

Physics news on the internet

Yu.N. Eroshenko, M.V. Sadovskii “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 1157–1159 (2020)

Reviews of topical problems

D.K. Belashchenko “Does the embedded atom model have predictive power?” Phys. Usp. 63 1161–1187 (2020)

L.P. Babich “Relativistic runaway electron avalanche” Phys. Usp. 63 1188–1218 (2020)

Instruments and methods of investigation

P. Mazarov, V.G. Dudnikov, A.B. Tolstoguzov “Electrohydrodynamic emitters of ion beams” Phys. Usp. 63 1219–1255 (2020)

Methodological notes

A.V. Belinsky “Wigner's friend paradox: does objective reality not exist?” Phys. Usp. 63 1256–1263 (2020)

Personalia

V.M. Agranovich, E.B. Aleksandrov, S.N. Bagaev, I.V. Grekhov, A.G. Zabrodskii, S.V. Ivanov, E.L. Ivchenko, V.V. Kveder, B.V. Novikov, R.A. Suris, V.B. Timofeev, I.A. Shcherbakov “Aleksandr Aleksandrovich Kaplyanskii (on his 90th birthday)” Phys. Usp. 63 1264–1265 (2020)

Physics news on the internet

Yu.N. Eroshenko “Physics news on the Internet (based on electronic preprints)” Phys. Usp. 63 1266–1267 (2020)