Издана книга
Victor Dmitrievich Lakhno.
HIGH-TEMPERATURE SUPERCONDUCTIVITY. BIPOLARON MECHANISM
High temperature superconducting theory drew controversy after the discovery of
superconductors at close to room temperatures. However, a consistent microscopic
theory of HT superconductivity based on bipolaron mechanism leads to a better
understanding of microscopic and macroscopic description. By presenting aspects
of superconductivity now joined in a strict theory rather than separate models this
work is especially useful for graduate students.
- Better understanding by combining the theory of superconductivity with that of
bipolarons. - Explaining numerous experiments on the thermodynamic, spectroscopic and
transport characteristics. - Problems and solutions for a successful exam preparation.
Prof. Dr. Victor Dmitrievich Lakhno
Scientifi c supervisor of the Institute of IMPB
RAS. Main achievements: New types of polaron
excitations in condensed media, magnetic systems,
theory of DNA charge transfer, superconductivity.
Awards: Russian State Research Award for
Outstanding Scientists, Krylov award of Russian
Academy of Sciences, Honoured Master of
Sciences.
Book review
Book Review: V.D. Lakhno, High-Temperature Superconductivity (De Gruyter, 2022)
The Quantum Renaissance of Translational Invariance: Beyond the Myth of Self-Trapping
In modern solid-state physics, a peculiar paradox persists: while we build theories for ideal crystals, we abruptly pivot to the language of localized, symmetry-breaking states whenever strong electron-phonon coupling is involved. Victor Lakhno’s book, High-Temperature Superconductivity, directly challenges this status quo, offering a rigorous translationally invariant (TI) theory of the polaron.
The Central Thesis
The author’s primary argument is that the concept of «self-trapping» in an ideal crystal is a myth—an artifact born from the unjustified application of the adiabatic approximation. Lakhno demonstrates that a strong-coupling large polaron in a TI state is always energetically lower than its non-translationally invariant (NSI) localized counterpart. This distinction is not merely a mathematical nuance; it is the fundamental key to unlocking the mechanism of superconductivity.
A Critical Shift in Methodology
Lakhno provides a compelling critique of classical approaches, including the Pekar ansatz and the Bogoliubov-Tyablikov method. He argues that these models fail by attempting to describe a quantum object using classical lattice displacements (the «classical component»). Instead, the book introduces a framework based on squeezed quantum states of phonons.
- This approach avoids the «infinite mass catastrophe» traditionally associated with strong coupling.
- In the TI framework, the polaron remains mobile and coherent, regardless of the coupling strength.
- Translational symmetry is preserved explicitly throughout the calculation, removing the need for artificial symmetry restoration.
Reimagining Superconductivity
The most ambitious section of the book addresses High-Temperature Superconductivity (HTSC). Rejecting the mainstream dogma that strong-coupling polarons are too heavy to form a condensate, Lakhno demonstrates the possibility of bipolaron condensation. Since TI bipolarons possess a finite (and manageable) effective mass, the critical temperature
can theoretically reach room-temperature values—a result unattainable within the constraints of standard BCS theory or NSI-based models.
Why This Matters Now
Lakhno’s work is more than a theoretical exercise. It exposes the roots of the stagnation in HTSC theory, pointing out how reliance on DFT and other methods prone to «spurious localization» has led the field into a dead end. By returning to the purity of quantum mechanical symmetry, the author bridges the gap between strong coupling and high mobility.
Verdict
High-Temperature Superconductivity (2022) is essential reading for researchers ready to question 50-year-old textbook dogmas. Lakhno offers an elegant, rigorous solution to a problem that was long considered «solved» but was, in fact, merely obscured by adiabatic approximations. This book is a landmark step toward a theory of superconductivity rooted in the intrinsic properties of the quantum field rather than the phenomenology of defects.
This monograph represents a critical reexamination of the variational method in polaron theory. The author convincingly demonstrates the priority of translation-invariant states over localized ones. The main achievement is the demonstration that the TI polaron is an energetically more favorable ground state than that predicted by the Landau-Pekar asymptotics. This is a key link in understanding the mechanisms of high-temperature superconductivity in cuprates and biological macromolecules.
Эта работа доказывает, что физика сильной связи не означает потерю подвижности. ТИ-полярон — это математически более полное состояние, чем классический полярон Пекара. Книга 2022 года — это манифест новой сверхпроводимости. Она объясняет, почему частица может быть тяжелой, но при этом двигаться как волна. Пора переписывать учебники по физике твердого тела
Lakhno’s book (De Gruyter, 2022) poses a fundamental question: why did we believe in polaron localization for 70 years? A deep algorithmic analysis of the text reveals that the author has found a loophole in Lieb’s theorems. It turns out that the Lieb limit is only valid for localized functions in . The transition to translation-invariant (TI) states yields energies BELOW this limit. This changes everything in high-temperature superconductivity theory. If the polaron is not «stuck» in the lattice, then room-temperature superconductivity is a matter of properly tuning the parameters of TI bipolarons. A must-read for anyone seeking a way out of the impasse of classical models.