Chapter 25: Questions and Answers at the Lecture
UCLA's Department of Physics and Astronomy organized a small but high-level academic seminar for Leonard and David's presentation on their latest breakthrough work.
The lecture hall was packed, with many local experts, scholars, and even some industry researchers attending specifically for the event. The air was filled with an atmosphere of anticipation mixed with scrutiny.
Leonard stood at the podium, took a deep breath, and began clearly articulating their experimental design, the complex data analysis process, and the final conclusions.
He spoke with clear organization, and the data charts he presented were rigorous and detailed.
When the Q&A session began, the atmosphere remained relatively normal and friendly. After questions from a few scholars,
an elderly professor with white hair and an imposing demeanor, sitting in the front row, raised his hand. The venue instantly quieted significantly; those who knew him understood the real test had arrived.
That was Professor Erwin Miller of UCLA, a recognized authority in traditional condensed matter physics, especially in the field of transport measurements, known for his profound achievements and almost harsh rigor in data interpretation.
"Dr. Hofstadter," Professor Miller's voice was resonant, carrying natural authority.
"The data quality you presented is high, and I have no major objections to the measurement technique itself."
He then shifted his tone, his gaze sharp and directly hitting the core. "However, your attribution of this relatively weak and complex resonance signal directly, and almost exclusively, to the theoretically predicted magnetic impurity scattering—I believe this conclusion is too hasty, even... reckless!"
The entire lecture hall fell silent, all eyes moving between Professor Miller and Leonard, whose face was beginning to pale on stage.
"In such complex topological insulator materials, which inherently possess substantial disorder, especially in the thin film samples you used,"
Professor Miller continued, his tone growing sterner, "there are multiple mechanisms that could produce similar weak signals. A more probable,
and more mundane, explanation is that this signal originates from some unknown intrinsic defect related to your specific sample growth process! Your work, in my opinion, is more like catching a 'phantom' you wished to see in a system that isn't 'clean' enough to begin with, then eagerly labeling it with an ideal tag.
Your so-called 'multi-parameter scanning' method, while varied, likely only amplifies the system's noise and random artifacts, besides adding unnecessary complexity!"
This direct and extremely severe questioning from an academic authority struck Leonard like a sledgehammer.
The possibility Professor Miller pointed out indeed existed logically; it was the 'devil's advocate' any new discovery couldn't avoid, and without exclusive evidence, was difficult to completely refute.
Leonard's face instantly flushed red. He tried explaining how their data analysis had, as much as possible, ruled out other possibilities,
but under Professor Miller's rapid-fire questioning and the pressure of his powerful academic authority, Leonard's words became somewhat weak, chaotic, and he even began to stutter, fine beads of sweat appearing on his forehead. He was nearly speechless.
The murmurs from the audience began to buzz, and many initially neutral listeners also showed expressions inclining toward Professor Miller's criticism.
Leonard felt a wave of despair and helplessness. He could almost see their exciting discovery being dragged into the quagmire of 'non-reproducibility' or 'misinterpretation,' about to be labeled 'unreliable.'
Just then, a calm and clear voice rang out from behind the podium:
"Professor Miller, may I add a few words, please?"
Everyone's gaze, as if drawn by a magnet, instantly turned to the source—it was David, who'd been sitting in the front row, quietly listening to the entire exchange.
He stood, walked calmly to the podium, exchanged a reassuring glance with a somewhat flustered Leonard, and then naturally stood before the microphone.
"Professor Miller," David's opening was humble and proper, showing full respect to the academic senior.
"Your question regarding the possibility of intrinsic sample defects is very professional and hits at the core test that our work, and indeed any new method, must face. This reflects the rigorous spirit that should exist in the physics community."
His tone then shifted: "However, we believe that effectively distinguishing between 'disordered signals originating from random, localized defects' and 'bulk effect signals originating from specific physical laws' is not an unsolvable mystery.
The key is that we need to introduce a new detection dimension that can reveal its inherent regularity."
He turned to the whiteboard, picked up a marker, and while fluently drawing a schematic diagram, clearly articulated, as if stating a well-thought-out plan he'd already perfected:
"Our previous two-dimensional scanning was conducted on the plane formed by magnetic field (B) and gate voltage (Vg). But to truly pinpoint this signal's physical origin and rule out competing explanations such as random defects, we need to upgrade our detection to three-dimensional scanning—"
On the existing two-dimensional coordinate graph, he cleanly drew a third axis vertically and clearly labeled it "Temperature (T)."
"—Introducing temperature as the third crucial variable and detection dimension!"
David's voice carried power based on deep physical understanding and rigorous logic.
"Different physical mechanisms have their unique 'fingerprints' in their temperature dependence. Signals generated by random, localized sample defects often vary with temperature in a chaotic, discontinuous, and unpredictable manner.
However, the magnetic impurity scattering that our theory predicts and seeks will inevitably follow specific statistical physics laws, and its signal strength, energy position, and even linewidth will exhibit smooth, continuous, and systematically evolving behavior with temperature that can be quantitatively described by specific theoretical models!"
He skillfully blended solid condensed matter physics foundations with research vision more than a decade ahead of its time, clearly outlining a highly persuasive experimental verification blueprint for precise 'physical fingerprint' identification using the temperature dimension.
The clarity of his thinking and precision of his grasp on the problem's essence made many senior researchers in the audience nod secretly, their eyes showing admiration.
"Therefore,"
David faced the entire audience, finally concluding, his gaze calmly meeting Professor Miller, whose expression had shifted from sternness to surprise and uncertainty.
"Professor Miller, the most powerful and direct way to respond to your valuable and crucial questions is not to get entangled in endless verbal debates at the current data level,
but to design and complete this more complex, yet more decisive, 'three-dimensional scan' experiment. Using three-dimensional, dynamic data that includes temperature evolution laws, to ultimately prove to ourselves, and to the entire academic community, that what we're seeing is not a phantom,
but real physics. We are willing, and indeed ready, to accept this challenge."
David's speech, like a brilliant, game-changing move in a tense chess match, instantly reversed the entire venue's atmosphere.
He didn't get bogged down in entanglement with Professor Miller within the existing data framework but directly proposed a higher-level, theoretically impeccable, and highly actionable verification plan, skillfully and constructively returning serve.
Simultaneously, he fully demonstrated his foresight beyond the current research stage and his profound academic potential.
The lecture hall was quiet for a moment, then warm and sustained applause erupted.
This applause was not only for David's meticulous thinking, calm response, and scientific courage to face the most severe challenges, but also for the eternal spirit of science itself: "solving controversies with more precise experiments."
Professor Miller evidently didn't expect this young collaborator to so quickly propose a counter-proposal and advanced solution that was almost flawless on both logical and experimental levels.
He paused, the stern lines on his face softening slightly. He opened his mouth but ultimately didn't utter any refutation, merely nodding slightly and falling into deep thought.
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