What other researchers can learn from the Kouwenhoven case

That is the conclusion of the TU Delft’s Executive Board after reading the second report of the Internal Committee for Scientific Integrity (CWI), and interviews with the two defendants in the case: quantum professor Leo Kouwenhoven and his former postdoc Hao Zhang.

The CWI-report had been delivered on February this year, the interviews followed in June. The Executive Board’s conclusion was published on 18 December on the website (in Dutch) of the umbrella organization Universiteiten van Nederland (Universities of the Netherlands). In addition to the CWI’s assessment and opinions, it contains the executive board’s deliberations and final conclusions, with the board also reaching out to its own.

Data handling

The CWI-report was prompted by a report of violation of scientific integrity. In their motivation of the withdrawal of a Nature publication on nanowires, the researchers themselves mention inappropriate deletion and cropping  of measurement data. They therefore decide to retract their 2017 article on 19 April 2022.

That was more than a year after the earlier withdrawal of a high-profile Majorana article that the CWI investigated earlier.

Referring to the nanowire article, the integrity commission concluded that there had been incorrect processing of data by Zhang (‘Accused 2’). Kouwenhoven was also partly responsible for this, the integrity commission concluded and referred to the working conditions that enabled incorrect data processing.

Other conclusion

After discussions with those involved, the Executive Board follows the CWI’s assessment of Zhang. ‘First and foremost, for the Executive Board, the responsibility of [defendant 2] in this matter is paramount,’ the Board ruled on 7 November 2023.

But about Kouwenhoven, the Executive Board wrote: ‘A manager must – taking all control mechanisms into account – be able to rely to a certain extent on the work of experienced researchers in his team, as [defendant 2] was in this situation.’

Kouwenhoven also had no reason to distrust his postdoc, the Executive Board writes, and he was ‘not involved in the measurements’ for the article at hand.’He is not held responsible in this case for the actions of [defendant 2].’ In other words, the Board clears Kouwenhoven of blame.

Recommendations

The Executive Board does follow two of the CWI’s general recommendations on working with data:

Working pressure

The CWI’s advice mentions ‘the apparent pressure that existed among the research group (…) to produce results during the period in question’, according to the UvN report.

The Board knew about these rumours, it would appear, and approached staff for a statement on the working atmosphere. On the one hand, these statements revealed appreciation for Kouwenhoven’s inspirational leadership and the opportunity to develop in the research field. On the other hand, reports came in about ‘the high level of competition present during the period in question.’

‘For some employees, this led to stress that eventually led to irregularities’, reads the Executive Board’s (cvb) final verdict. ‘The cvb takes that to heart.’

In the report, the Board writes that it values a research climate of ‘relative calm’ while respecting integrity standards. Adopting the above CWI recommendations fits in with this aim. In addition, Kouwenhoven’s appointment as university professor is likely to give him a calmer research environment.